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WO2018101281A1 - Dispositif optique - Google Patents

Dispositif optique Download PDF

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Publication number
WO2018101281A1
WO2018101281A1 PCT/JP2017/042695 JP2017042695W WO2018101281A1 WO 2018101281 A1 WO2018101281 A1 WO 2018101281A1 JP 2017042695 W JP2017042695 W JP 2017042695W WO 2018101281 A1 WO2018101281 A1 WO 2018101281A1
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WO
WIPO (PCT)
Prior art keywords
wavelength
incident
diffraction
optical
optical axis
Prior art date
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Ceased
Application number
PCT/JP2017/042695
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English (en)
Japanese (ja)
Inventor
大輔 福岡
室　清文
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Spectra Quest Lab Inc
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Spectra Quest Lab Inc
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Publication date
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Priority to JP2018554168A priority Critical patent/JP6893039B2/ja
Publication of WO2018101281A1 publication Critical patent/WO2018101281A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/12—Generating the spectrum; Monochromators
    • G01J3/18—Generating the spectrum; Monochromators using diffraction elements, e.g. grating
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
    • H01S5/14—External cavity lasers

Definitions

  • the present invention relates to an optical device. More specifically, the present invention relates to an optical device applicable to a wavelength tunable filter.
  • a wavelength tunable filter that selectively transmits a light flux in a specific wavelength band is used in the field of optical measurement or optical communication.
  • the performance of the wavelength tunable filter is as follows: the transmittance of the light beam of the transmitted wavelength, the shielding rate of the light beam of the shielded wavelength, the bandwidth of the transmission wavelength band, the variable width of the center wavelength of the transmission band, and the cut-on of the rise / fall of the transmittance / Expressed by off steepness etc.
  • the wavelength tunable filter is used between the preceding optical system and the subsequent optical system for the purpose of use, the position and angle of the optical axis incident on the system and the optical axis emitted from the system are determined by the transmission wavelength. It is required to be invariant to change.
  • Wavelength tunable filters are generally divided into a configuration using a diffraction / dispersion element for wavelength separation and a configuration using a dielectric multilayer filter.
  • the wavelength tunable filter using the dielectric multilayer filter changes the transmission wavelength band by changing the incident angle of the incident light beam to the dielectric band multilayer filter. This is done by rotating the dielectric band multilayer filter about an axis perpendicular to the incident surface (see, for example, Patent Document 1 below).
  • wavelength tunability using wavelength diffractive / dispersive elements for wavelength separation is achieved by selecting the exit optical axis.
  • the rotation is performed by rotating the wavelength separation element about an axis perpendicular to the incident surface, or by translational movement of a slit, an optical fiber, or the like on the exit optical axis (for example, Patent Document 2 and Patent Document 3 below). reference).
  • Patent Document 1 discloses a tunable filter having a generally high transmittance reflecting the characteristics of a dielectric band multilayer filter. However, it is difficult to change the variable width of the transmission wavelength band beyond 100 nm. Further, the steepness of the shielding rate and cut-on / off is only to be realized by the dielectric band multilayer filter.
  • the present invention provides a wavelength tunable filter that solves the above-described problems and has a high transmittance in a wide wavelength band, and in which an incident / exit optical axis does not change when the transmission wavelength band changes. Objective.
  • An optical device that solves the above problems includes a transmissive diffraction element, a reflective element, and a rotating mechanism that supports the transmissive diffraction element and the reflective element. And a function of rotating around the rotation axis of the rotation mechanism.
  • the arrangement is such that the line of intersection of the diffraction grating plane of the diffraction element and the reflection surface of the reflection element coincides with the rotation axis of the rotation mechanism. Preferably there is.
  • the diffraction grating plane of the diffraction element and the reflection surface of the reflection element form an angle of 90 degrees and are aligned with the rotation axis of the rotation mechanism. It is preferable.
  • An optical device includes a transmission diffraction element, a reflection element, and a rotation mechanism that supports the transmission diffraction element and the reflection element.
  • the transmission diffraction element and the reflection element rotate. It is preferable to have a function of rotating around the rotation axis of the mechanism, and to include a retroreflective optical element outside the rotating mechanism.
  • an optical device that has a high transmittance in a wide wavelength band, and whose incident / exit optical axis does not change when the wavelength changes.
  • FIG. 1 is a schematic diagram of a transmissive diffraction grating according to Embodiment 1.
  • FIG. 3 is a schematic view of the performance of a transmission diffraction grating according to Embodiment 1.
  • FIG. 3 is a schematic view of the performance of a transmission diffraction grating according to Embodiment 1.
  • 2 is a schematic diagram of an optical arrangement of a wavelength tunable filter according to Embodiment 1.
  • FIG. 2A and 2B are a schematic view and an overhead view of an optical arrangement of a wavelength tunable filter according to the first embodiment.
  • FIG. 1 is a diagram schematically illustrating an external resonant laser according to Example 1.
  • FIG. FIG. 4 is a device photograph of the principle verification experiment of the external resonance laser according to Example 1.
  • 1 is a photograph of a prototype machine of an external resonant laser according to Example 1.
  • FIG. 6 is a photograph of a bandpass filter according to Embodiment 2.
  • FIG. It is a figure which shows the wavelength selection result of the band pass filter which concerns on Example 2.
  • FIG. 4 is a device photograph of the principle verification experiment of the external resonance laser according to Example 1.
  • 1 is a photograph of a prototype machine of an external resonant laser according to Example 1.
  • FIG. It is a figure which shows the LD injection current value dependence of the laser beam intensity
  • FIG. 6 is a photograph of a bandpass filter according to Embodiment 2.
  • FIG. It is a figure which shows the wavelength selection result of the band pass filter which concerns on Example 2.
  • FIG. 6 is a block diagram of a wavelength tunable picosecond laser according to Example 3.
  • FIG. 6 shows an output of an EO intensity modulator of a wavelength tunable picosecond laser according to Example 3.
  • FIG. 6 is a schematic diagram of a conventional group velocity dispersion generating system according to Embodiment 3.
  • FIG. It is a figure which shows the wavelength dependence of the distance L between diffraction elements required for the chirped pulse compression which concerns on Example 3.
  • FIG. It is a figure which shows the time waveform before and behind the pulse compression of the wavelength variable picosecond laser which concerns on Example 3.
  • FIG. 6 is a block diagram of a wavelength tunable picosecond laser according to Example 3.
  • FIG. 6 shows an output of an EO intensity modulator of a wavelength tunable picosecond laser according to Example 3.
  • FIG. 6 is a schematic diagram of a conventional group velocity dispersion generating system according to Embodiment 3.
  • FIG. It is a figure which shows the wavelength dependence of the distance
  • FIG. 1 is a diagram showing an outline of an optical arrangement of a wavelength tunable filter 1 which is an example of an optical device according to the present embodiment.
  • a wavelength tunable filter (hereinafter referred to as “the present wavelength tunable filter”) 1 according to the present embodiment includes a transmissive diffraction element 2 that diffracts incident light and a reflective element that reflects incident light. 3. Further, as shown in the figure, the wavelength tunable filter 1 includes a transmission type diffraction element 2 and a rotation mechanism 4 that supports the reflection element 3, and the transmission type diffraction element 2 and the reflection element 3 include a rotation mechanism. 4 has a function of rotating around the rotation axis.
  • VPH-G volume phase holographic grating
  • the diffractive element 2 and the reflective element 3 are diffracted by the diffractive element 2 on the rotary support 4 having a rotation axis that coincides with the intersection of the diffraction grating plane of the diffractive element 2 and the reflective surface of the reflective element 3.
  • the plane and the reflection plane of the reflection element 3 are fixed at an angle of 90 degrees and can be rotated together.
  • the diffraction grating plane in the diffraction element means a surface on which the diffraction grating is formed, not the surface (diffraction surface) including the optical axis of light.
  • the incident angle of the light beam incident on the reflecting element 3 coincides with ⁇ . That is, the optical axis angle of the light beam emitted from the reflecting element 3 matches the optical axis angle of the light beam incident on the diffraction element 2.
  • the distance between the rotation axis of the rotary support 4 and the incident optical axis is r
  • the distance between the rotation axis of the rotary support 4 and the intersection of the diffraction plane of the diffraction element 2 and the incident optical axis is r / Sin ⁇ .
  • the arrangement shown in FIG. 1 is based on the change in the incident angle of the incident light beam on the diffraction element 2, that is, the position / angle of the exit optical axis of the light beam having the wavelength ⁇ that satisfies the condition regardless of the rotation phase of the rotating mechanism 4. Is an invariant arrangement.
  • the condition of 90 degrees is merely an example in this arrangement.
  • the condition is satisfied even when the diffractive element 2 and the reflective element 3 are arranged with a deviation of ⁇ from 90 degrees.
  • the position and angle of the emission optical axis of the light beam having the wavelength ⁇ are not changed. That is, the diffraction grating plane in the diffraction element and the reflection surface in the reflection element are not necessarily 90 degrees.
  • the length of the line segment AB is expressed by the following equation, where A is the intersection of the perpendicular line from the rotation axis of the rotation mechanism 4 to the incident optical axis, and B is the intersection of the incident optical axis and the outgoing optical axis. Is done.
  • the slit 5 or an optical element having an equivalent function By arranging the slit 5 or an optical element having an equivalent function on the emission optical axis, it becomes possible to select only a light flux having a wavelength ⁇ that satisfies the above condition.
  • the transmission wavelength bandwidth and the like can be changed by using a lens system and a slit opening / closing mechanism in combination on the emission optical axis.
  • the diffractive element having optical characteristics corresponding to VPH-G or the like has high diffraction efficiency with respect to a broadband wavelength satisfying the condition. Therefore, the tunable filter of this arrangement has a high transmittance in the broadband, It becomes a filter whose incident and exit optical axes are unchanged.
  • This arrangement is effective for all optical systems using VPH-G or diffractive elements having optical characteristics equivalent thereto under the conditions of maximum efficiency and invariable incident / exit optical axes.
  • FIG. 6 shows an optical arrangement similar to that of the first embodiment, but is further a schematic view of the optical arrangement in which the retroreflective element 6 is arranged outside the rotation mechanism, specifically on the exit optical axis, and its bird's-eye view. is there.
  • this apparatus is suitable for a spectroscope.
  • the reflective element 7 is disposed on the incident optical axis.
  • the reflection element can adopt the same configuration as that of the reflection element 3, but may be one that reflects or transmits light (for example, a polarization beam splitter) depending on the state of light. What transmits and reflects a part of light (for example, a half mirror), a so-called beam splitter may be used.
  • a so-called beam splitter may be used.
  • the light beam incident from the incident optical axis has the maximum diffraction efficiency at a wavelength at which the incident angle ⁇ and the diffraction angle ⁇ to the diffraction element 2 coincide with each other as in FIG. Is done.
  • the emitted light beam is retroreflected by a retroreflective element 6 such as a retroreflector.
  • the retroreflective element 6 is installed so that the retroreflected light beam is offset in the rotation axis direction with respect to the original optical axis, and the projection on the incident surface coincides with the original optical axis.
  • a hollow roof mirror is suitable as described above, but is not limited thereto, and examples thereof include a hollow retroreflector, a corner cube prism, and a right-angle prism.
  • the retroreflected light beam follows the original optical path in the reverse direction and is emitted in the direction of the incident optical axis. Since the emitted light beam is emitted with an offset in the direction of the rotation axis with respect to the incident optical axis, it can be easily separated from the incident optical axis by the reflecting element 7 or the like.
  • the emitted light beam is shifted in parallel on the emission optical axis and aligned in parallel.
  • a wavelength filter for selectively extracting wavelengths with a slit or the like, and can also be used as a monochromator.
  • a multichannel spectroscope can be configured by imaging with a line sensor or the like. The center wavelength, resolution, bandwidth, and the like of the wavelength filter and the spectroscope can be easily adjusted and controlled by the rotation phase of the rotation mechanism and the optical path length from the diffraction element 2 to the retroreflective element 6.
  • the arrangement corresponds to the double passage of the optical arrangement of the first embodiment, and the emitted light of the light beam having the wavelength ⁇ that satisfies the incident / diffraction angle matching condition regardless of the rotation phase of the rotation mechanism 4. It goes without saying that the position and angle of the axes are invariable, and in addition to this, there is a function of keeping the incident and exit optical axes unchanged even when the above-mentioned conditions for matching the axes are not satisfied.
  • FIG. 7 is a schematic view and an overhead view of the optical device according to the present embodiment.
  • the engineering arrangement of the present optical apparatus is an optical arrangement in which retroreflective elements 6 and 8 are installed before and after the optical arrangement of the first embodiment, respectively. In addition to a bandpass filter with variable bandwidth, this arrangement is useful as a group velocity dispersion generator.
  • the rotating mechanism 4 has the same optical characteristics as in the first embodiment.
  • the light beam emitted from the diffractive element 2 is shifted by the retroreflective element 6 in parallel to the emitted light beam and within the incident plane, and is incident again on the diffractive element 2.
  • the light beam diffracted by the diffraction element 2 and reflected by the reflection element 3 is emitted parallel to the incident optical axis and shifted into the incident plane.
  • the light beam re-emitted in the direction of the incident optical axis is shifted again in the direction of the rotation axis parallel to the incident optical axis by the retroreflective element 8 and enters the reflective element 3 again.
  • the re-incident light beam is reflected and diffracted in the order of the reflective element 3, the diffractive element 2, the retroreflective element 6, the diffractive element 2, and the reflective element 3 in the order of the optical axis whose projection on the incident surface is exactly the same as the optical path so far. It is emitted again in the direction of the incident optical axis. At this time, since the light is emitted with an offset in the direction of the rotation axis with respect to the incident optical axis, it is easily separated from the incident optical axis by the reflecting element 7 or the like.
  • the incident light beam has a finite wavelength width
  • the diffraction element 2 After passing through the diffraction element 2 twice, it is separated into each wavelength in front of the retroreflective element 8 and aligned in parallel. Thereafter, it is re-integrated into one light beam by passing through the diffraction element 2 twice again.
  • the optical arrangement has a high tolerance such as a condition of matching the axes and a rotational axis deviation.
  • FIG. 8 is a diagram schematically showing an external resonant laser having a low loss in a wide band using the wavelength tunable filter according to one embodiment of the present invention as a wavelength selection element.
  • the collimated light from the laser diode chip 9 and the collimation lens 10 is used as incident light, the VPH-G as the diffraction element 2, and the total reflection mirror as the reflection element 3 are assembled in the structure serving as the rotation mechanism 4.
  • the laser diode chip 9 has a surface with a low reflection coating and a surface with a high reflection coating, and light emitted from the laser diode chip 9 is emitted from a surface with a low reflection coating.
  • Light incident on the wavelength tunable filter emitted from the laser diode chip 9 and the collimation lens 10 is spontaneous emission amplification (ASE) light having a wide wavelength band.
  • ASE spontaneous emission amplification
  • Light beams having other wavelengths emitted from the element 3 are emitted at an angle different from the incident optical axis.
  • the half mirror 11 is installed on the emission optical axis at an angle perpendicular to the incident optical axis, only the luminous flux is specularly reflected, and again passes through the reflective element 3, the diffractive element 2, and the collimation lens 10, and the laser diode chip. Is incident on.
  • the high reflection surface of the laser diode chip 9 and the front surface of the half mirror resonate with each other, and light having a wavelength selected by the wavelength tunable filter is laser-oscillated.
  • the laser oscillation wavelength is variable by selecting the wavelength of the wavelength tunable filter, and the optical axis of the emitted laser light does not change when the wavelength changes, so that it is excellent in convenience as a wavelength tunable light source.
  • the optical axis of the ASE light having a wavelength different from that of the laser light, which is noise of the laser light source, does not overlap with the laser light, it is separated from the laser light and completely blocked, and has an ASE-Free wavelength with high spectral purity.
  • a variable laser light source is realized.
  • FIG. 9 shows a photograph of the device during a proof-of-principle experiment
  • FIG. 10 shows a photograph of a prototype machine for an ASE-Free tunable laser light source using the wavelength filter according to the present invention as a wavelength selection element.
  • FIG. 11 shows the dependence of the laser beam intensity output from the prototype machine on the LD injection current value. Even at an oscillation wavelength of 1090 nm at the gain edge where ASE light becomes apparent, the output is close to 0 up to the oscillation threshold, and it was confirmed that ASE light other than 1090 nm was excluded from the laser output (ASE-Free). .
  • FIG. 12 is a photograph of a band pass filter configured using the optical arrangement of the third embodiment.
  • the reflective element 3 and the diffractive element 2 are assembled to the rotary stage 4, and retroreflective elements 6 and 8 and a reflective element 7 for emission are disposed before and after the reflective element 3 and the diffractive element 2.
  • the center wavelength of the bandpass filter is determined by the rotational phase of the rotary stage 4, and the bandwidth is determined by the wavelength that can enter the retroreflective element 6 among the light beams diffracted by the diffraction element 2.
  • the retroreflective element 6 is assembled to the linear motion stage.
  • Fig. 13 shows the wavelength selection result of the bandpass filter.
  • a light beam incident on the system and a light beam selected by a band pass were coupled to a single-mode polarization-maintaining fiber, and a spectrum was acquired by a spectroscope.
  • the incident light flux to the system has a broad spectrum width ranging from 1000 nm to 1100 nm, and the wavelength was selected by this system to the center wavelengths of 1010 nm and 1050 nm.
  • the selection of the center wavelength is performed only by adjusting the rotation phase of the rotation mechanism 4. Further, the bandwidth can be defined by the length of the optical path from the diffraction element 2 to the retroreflective element 6.
  • the bandwidth can be adjusted by a width of 5 nm to 10 nm, and the solid line and the dotted line in FIG. 13 are spectra when they are 5 nm and 10 nm, respectively.
  • the bandwidth can be freely adjusted by the number of lines of the diffractive element 2 and the use of slits.
  • the band-pass filter of this system has a blocking performance exceeding at least 50 dB (OD5), and no stray light is observed. Furthermore, it has a steep rise width of less than 1 nm. The steepness depends on the beam diameter at the time of wavelength selection, and can be further steepened by using a lens or the like.
  • Fig. 14 shows the wavelength dependence of the transmittance of this system. Monochromatic light was incident on this system, and its output and the output after single-mode polarization-preserving fiber coupling were compared with the incident light intensity. Regardless of four diffractions at the diffraction element 2 and eleven reflections at the reflection element, etc., it has a maximum transmittance of more than 60% in free space and a transmittance of 50% or more over 100 nm.
  • Example 3 An example of the group velocity dispersion generator configured by the optical arrangement of the third embodiment is shown below.
  • the constructed system is the same as that of FIG.
  • FIG. 15 is a block diagram of a tunable picosecond laser using pulse compression by a tunable laser, an EO modulator, and a group velocity dispersion generator.
  • a continuous wave / single frequency output (10 mW) of a wavelength tunable laser whose wavelength is tunable from 980 nm to 1080 nm is used as a light source, frequency modulation of 10 GHz is performed by an EO frequency modulator, and the carrier frequency is the center.
  • About 20 optical combs (wavelength width of about 0.5 nm) are generated.
  • the optical comb output is intensity-modulated at 10 GHz by an EO intensity modulator, and only the up-chirp portion is extracted by adjusting the phase difference between the two modulators.
  • This up-chirped pulse is amplified to 1 W by a broadband optical amplifier from 980 nm to 1080 nm, and then pulse-compressed by a group velocity dispersion generator to generate a pulse train of 10 W-3 ps.
  • FIG. 16 shows the optical comb spectrum of the up-chirp before pulse compression, which is the output of the EO intensity modulator.
  • the up-chirped pulse can be pulse-compressed by a group velocity dispersion generator using a dispersion element such as a diffraction grating.
  • FIG. 17 shows a general pulse compression system used in a single color. L is the distance between the dispersive elements. L varies depending on the center wavelength, wavelength width, and dispersion of the dispersive element. For example, when a diffraction grating having 1700 lines / mm is used, the inter-element distance L required for compression of a chirped pulse of about 0.6 nm is shown in FIG. As shown in FIG.
  • FIG. 19 shows time waveforms before and after pulse compression when the pulse compression is actually performed using the apparatus of FIG.
  • the time waveform was acquired with an autocorrelator.
  • the width of the obtained time waveform is an autocorrelation waveform by an autocollimator, and the time width of the compressed pulse calculated from this waveform is 5 ps.
  • the waveform shown in FIG. 19 is acquired at the center wavelength of 1040 nm.
  • similar picosecond pulses are obtained in the wavelength region from 980 nm to 1080 nm.
  • This wavelength band is only an example of the present invention, and pulse compression using this system can be performed in any wavelength band by changing the light source laser, the EO modulator, the optical amplifier, the transmission diffraction grating, and the like.
  • the wavelength dependency of the transmittance of this system and the stability of the fiber couple are the same as the values shown in FIG. 13 of Example 2, and have a high and stable transmittance in a wide wavelength band.
  • the reflecting element 3 and the diffractive element 2 need be installed on the rotary stage, which can be realized with a small and inexpensive stage.
  • the amount of group velocity dispersion can be adjusted by the length of the optical path that reflects the retroreflective element 3 from the diffractive element 2 and reaches the diffractive element 2 again.
  • the amount of the group velocity dispersion of the retroreflective element 3 assembled on a uniaxial linear motion stage This is done by changing the position. This not only realizes high transmittance in a wide band, but also reduces the number of expensive optics and stages to a minimum, which is beneficial for space saving and cost reduction.
  • This device has industrial applicability as an optical device.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

La présente invention concerne un dispositif optique ayant une transmittance élevée dans une large bande de longueurs d'onde, et dans lequel les axes optiques d'incidence et d'émission ne changent pas lorsque la longueur d'onde change. À cet effet, un dispositif optique selon la présente invention comprend un élément de diffraction transmissif (2) qui diffracte la lumière incidente, un élément de réflexion (3) qui réfléchit la lumière incidente et un mécanisme de rotation (4) qui soutient l'élément de diffraction transmissif (2) et l'élément de réflexion (3). L'élément de diffraction transmissif (2) et l'élément de réflexion (3) sont soutenus de manière à pouvoir tourner autour d'un arbre de rotation du mécanisme de rotation (4). Dans ce cas, il est prévu de préférence un dispositif optique dans lequel des lignes d'intersection d'une surface de diffraction de lumière de l'élément de diffraction (2) et une surface réfléchissant la lumière de l'élément de réflexion (3) sont agencées de manière à coïncider avec ledit arbre de rotation.
PCT/JP2017/042695 2016-11-29 2017-11-28 Dispositif optique Ceased WO2018101281A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022033585A (ja) * 2020-08-17 2022-03-02 アンリツ株式会社 パルス変調光計測方法、パルス変調光計測プログラム、及び光スペクトラムアナライザ
JP2022057669A (ja) * 2020-09-30 2022-04-11 サンテック株式会社 波長可変フィルタ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6583873B1 (en) * 2000-09-25 2003-06-24 The Carnegie Institution Of Washington Optical devices having a wavelength-tunable dispersion assembly that has a volume dispersive diffraction grating
JP2010525604A (ja) * 2008-01-18 2010-07-22 オープンベース カンパニーリミテッド 波長可変装置及びその方法
WO2015056049A1 (fr) * 2013-10-15 2015-04-23 Uab Mgf Sviesos Konversija Dispositif d'étalement et dispositif de compression d'impulsion laser

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6583873B1 (en) * 2000-09-25 2003-06-24 The Carnegie Institution Of Washington Optical devices having a wavelength-tunable dispersion assembly that has a volume dispersive diffraction grating
JP2010525604A (ja) * 2008-01-18 2010-07-22 オープンベース カンパニーリミテッド 波長可変装置及びその方法
WO2015056049A1 (fr) * 2013-10-15 2015-04-23 Uab Mgf Sviesos Konversija Dispositif d'étalement et dispositif de compression d'impulsion laser

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022033585A (ja) * 2020-08-17 2022-03-02 アンリツ株式会社 パルス変調光計測方法、パルス変調光計測プログラム、及び光スペクトラムアナライザ
JP7136854B2 (ja) 2020-08-17 2022-09-13 アンリツ株式会社 パルス変調光計測方法、パルス変調光計測プログラム、及び光スペクトラムアナライザ
JP2022057669A (ja) * 2020-09-30 2022-04-11 サンテック株式会社 波長可変フィルタ
US11927770B2 (en) 2020-09-30 2024-03-12 santec Holdings Corporation Variable wavelength filter

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