CN109407332A - Broad band laser system color difference dynamic compensating device - Google Patents
Broad band laser system color difference dynamic compensating device Download PDFInfo
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- G—PHYSICS
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
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- 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
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- G02B27/0938—Using specific optical elements
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Abstract
本发明公开了一种宽带激光系统色差动态补偿装置，包含第一半波片、偏振分光镜、第一四分之一波片、凸透镜、凹透镜组、凹面反射镜、第一二维平移台、第二二维平移台、第二四分之一波片、平面反射镜、第二半波片。本发明采取像传递结构设计，并通过空间滤波小孔滤波，能够明显改善输出光束质量。该装置通过移动二维平移台可以控制凹透镜组、凹面反射镜与凸透镜之间的相对距离，能够逐渐改变入射到凹透镜组上的光束口径，从而起到连续控制色差补偿量的作用，有利于精确优化色差补偿效果。本发明装置可以作为色差补偿单元应用于超短脉冲激光系统，提供全系统的色差补偿，亦可用于普通光学系统，色差补偿范围较大。
The invention discloses a chromatic aberration dynamic compensation device for a broadband laser system, comprising a first half-wave plate, a polarizing beam splitter, a first quarter-wave plate, a convex lens, a concave lens group, a concave mirror, a first two-dimensional translation stage, A second two-dimensional translation stage, a second quarter-wave plate, a plane mirror, and a second half-wave plate. The present invention adopts the image transmission structure design, and can obviously improve the output beam quality through the spatial filtering pinhole filtering. The device can control the relative distance between the concave lens group, the concave mirror and the convex lens by moving the two-dimensional translation stage, and can gradually change the diameter of the beam incident on the concave lens group, so as to continuously control the amount of chromatic aberration compensation, which is conducive to accurate Optimize the chromatic aberration compensation effect. The device of the present invention can be used as a chromatic aberration compensation unit to be applied to an ultra-short pulse laser system, providing chromatic aberration compensation of the whole system, and can also be used in an ordinary optical system, with a large chromatic aberration compensation range.
Description
Technical field
The present invention relates to a kind of Chromatically compensated device of broad band laser system, especially a kind of high power femtosecond ultrashort pulse
Laser system color difference dynamic compensating device.
Background technique
In order to develop fusion energy resource technology, scientists have developed device of high power laser, for center fire and hurry up
The research of the technical solutions such as fire.In high power ultra-short pulse laser facility, cause optics first in order to avoid power density is excessive
Part damage, needs step by step to expand laser pulse, amplify.In general, high power laser system uses bigbore spatial filter
On the one hand structure realizes that beam size expands step by step, on the other hand filter out high-frequency spectrum noise and effectively realize Image relaying, improve
Beam quality.The spatial filter of traditional narrow pulse laser system generallys use Kepler's structure, i.e. the two pieces of positive lens in front and back
It is confocal to rearrange, space filtering aperture is equipped on confocal plane.Due to the material dispersion of lens system, broadband laser pulse
By being inevitably generated color difference when space filter lens, causes different wave length laser emitting angle different, work as convergence
Different wave length has different focal lengths when to focal plane, generates defocus dispersion (axial chromatic aberration), incident light bandwidth is bigger, and color difference is got over
Greatly.On the other hand, due to lens centre thickness, thin edge, the laser pulse by lens difference radial position has different arteries and veins
Rush time delay (PTD).For pulsewidth picosecond and the broad band laser system of femtosecond magnitude for, it is light that foot is lifted in the influence of color difference
Weight.The largest beam bore of high power ultra-short pulse laser system is usually up to tens centimetres, when broad band laser is filtered by space
After wave system system expands step by step, color difference amount is accumulated step by step, if the color difference of total system accumulation will be such that laser terminal gathers without overcompensation
Burnt performance generates serious space-time distortion: so that focal beam spot bore is become larger, peak power density reduces；Pulse temporal pulsewidth becomes
Width, signal-to-noise ratio reduce.
Currently, the means for eliminating color difference in high power ultra-short pulse laser system are mainly substituted including the use of achromatic lens
Simple lens carries out the skill such as pre-compensating for using full transmitting formula spatial filter substitution transmission-type filter, the Chromatically compensated unit of addition
Art means.Simple lens is replaced to be the traditional means for eliminating color difference, achromatism using two pieces of different materials composition achromatic lens groups
Lens group is usually bonded by the positive negative lens that two panels is made from a different material, and can be disappeared in the case where guaranteeing the focal length of lens
Except defocus dispersion；Replace transmission-type beam-expanding system that can theoretically evade PTD and defocus completely using total reflection beam-expanding system
The generation of dispersion.Achromatic lens group and full reflected system have in actual use although can effectively inhibit system color difference
Some limitations.For example, heavy caliber achromatic lens material processing difficulties, expensive；Full transmitting system is by light path folding and very
The limitation of sky transmission, it is difficult in compression indoor location.
Adding Chromatically compensated unit and carrying out precompensation is the main Chromatically compensated means of high power ultra-short pulse laser system.
Pre-compensation unit is including the Chromatically compensated unit based on diffraction element and based on the compensating unit of projection element.Based on diffraction
The Chromatically compensated unit of element is capable of providing biggish Chromatically compensated amount, but beam quality is substantially reduced；And utilize transmissive element
Color difference is compensated although beam quality is preferable, is limited to material and processing technology, it is difficult to provide biggish Chromatically compensated amount.Cause
This, it is urgent need to solve the problem that the compensation device of big Chromatically compensated amount and excellent beam quality can be taken into account by, which how designing,.
Summary of the invention
The present invention provides a kind of broad band laser system color difference dynamic compensating devices, can satisfy different bandwidth laser system
Chromatically compensated requirement.The apparatus structure is simple, and optical path adjusting is convenient, can be freely moved into removal and not influence main optical path.It compares
Traditional Chromatically compensated technology, the device take Image relaying structure to design, and by space filtering pin-hole filter-ing, can obviously change
Kind output beam quality.The device by mobile two-dimension translational platform can control concavees lens group, concave mirror and convex lens it
Between relative distance, the beam size being incident in concavees lens group can be gradually changed, so that it is Chromatically compensated to play continuous control
The effect of amount is conducive to the Chromatically compensated effect of accurate optimization.The device can be used as Chromatically compensated unit application in ultrashort pulse
Laser system, provides system-wide Chromatically compensated, also can be used for common optical system, Chromatically compensated range is larger.
Technical solution of the invention:
A kind of broad band laser system color difference dynamic compensating device, it is characterized in that: including half-wave plate, polarization splitting prism,
First quarter-wave plate, convex lens, spatial filter, concavees lens group, concave mirror, for concavees lens group place the one or two
The second two-dimension translational platform, the second quarter-wave plate, the plane mirror and the second half tieing up translation stage, being placed for concave mirror
Wave plate；The convex lens forms confocal system with concavees lens group, concave mirror；
Plane of incidence light is changed into P-polarized light by first half-wave plate, vertically enters after polarization spectroscope reflects
It is mapped to the first quarter-wave plate, after first quarter-wave plate transmission, the coke of confocal system is converged at by convex lens
It is incident on concavees lens group after the described spatial filter filtering at point, diverging incident is to concave reflection after the transmission of concavees lens group
Mirror optical path after concave mirror reflects successively is restored by concavees lens group, spatial filter and convex lens along backtracking
For planar light, it is changed into S polarized light and the transmitted light warp after polarization spectroscope transmits after the transmission of the first quarter-wave plate
Plane mirror is impinged perpendicularly on after crossing the transmission of the second quarter-wave plate, along backtracking after plane mirror reflection,
Become P-polarized light again after the second quarter-wave plate and by saturating by the second half-wave plate after 90 ° of polarization spectroscope reflections
It penetrates.
By adjusting the relative distance between the concavees lens group, concave mirror and convex lens, can be realized compared with
A wide range of interior accurate color difference dynamic in big bandwidth range compensates.
First half-wave plate, the second half-wave plate, the first quarter-wave plate, the second quarter-wave plate are according to reality
The case where incident light source, selects the zero-th order waveplates or achromatic waveplate of corresponding wave band.
The concavees lens group can be designed using simple lens, and biconcave lens or more concavees lens combining forms also can be used,
According to incident light source situation broadband anti-reflection film can be plated in concavees lens front and rear surfaces.
The concavees lens group and concave mirror can be needed according to real system using spherical design or using aspherical
Design.
The spatial filter effect is space filtering, prevents near focal point air breakdown, if system power is not high,
The cavity of spatial filter, which can remove, only retains filtering aperture.
Compared with prior art, technical effect of the invention:
1) structure is simple, and optical path adjusting is convenient, can be freely moved into removal, not influence main optical path, low to environmental requirement.
2) traditional Chromatically compensated technology is compared, the present apparatus takes Image relaying structure to design, and passes through space filtering aperture
Filtering, can be obviously improved output beam quality.
3) by mobile two-dimension translational platform can control between concavees lens group, concave mirror and convex lens it is opposite away from
From can gradually change the bore for being incident on light beam in concavees lens group, to play the effect of the Chromatically compensated amount of continuous control, have
Conducive to the Chromatically compensated effect of accurate optimization.
4) present apparatus can be used as Chromatically compensated unit application in ultra-short pulse laser system, provides system-wide color difference and mends
It repays, also can be used for common optical system, Chromatically compensated range is larger.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of broad band laser system color difference dynamic compensating device of the present invention；
Specific embodiment
Below with reference to embodiment and attached drawing, the invention will be further described, but protection model of the invention should not be limited with this
It encloses.
First referring to Fig. 1, Fig. 1 is the structural schematic diagram of broad band laser system color difference dynamic compensating device of the present invention, including
Half-wave plate 1, polarization splitting prism 2, the first quarter-wave plate 3, convex lens 4, spatial filter 5, concavees lens group 6, concave surface are anti-
Penetrate mirror 7, the first two-dimension translational platform 8 placed for concavees lens group 6, the second two-dimension translational platform 9 placed for concave mirror 7, the
Two quarter-wave plates 10, plane mirror 11 and the second half-wave plate 12；The convex lens 4 and concavees lens group 6, concave reflection
Mirror 7 forms confocal system；
Plane of incidence light is changed into P-polarized light by first half-wave plate 1, vertical after the reflection of polarization spectroscope 2
It is incident on the first quarter-wave plate 3, after first quarter-wave plate 3 transmission, converges at confocal system by convex lens 4
Focus F at be incident on concavees lens group 6 after the spatial filter 5 filters, diverging incident arrives after the transmission of concavees lens group 6
Concave mirror 7 through concave mirror 7 reflection after optical path along backtracking, successively by concavees lens group 6, spatial filter 5 with
And convex lens 4 reverts to planar light, is changed into S polarized light and saturating through polarization spectroscope 2 after the transmission of the first quarter-wave plate 3
Transmitted light after penetrating impinges perpendicularly on plane mirror 11 after the transmission of the second quarter-wave plate 10, through the plane mirror
Along backtracking after 11 reflections, become P-polarized light again after the second quarter-wave plate 10 and by 290 ° of polarization spectroscope
It is transmitted after reflection by the second half-wave plate 12.
Embodiment:
By taking SG II-5PW laser aid as an example, laser system flashlight centre wavelength 808nm, FWHM bandwidth 50nm is
The total color difference of system derives from Pyatyi spatial filter, and color difference amount is acquired by formula (1):
Apparatus of the present invention are placed between third level spatial filter and fourth stage spatial filter, beam size 16mm.
According to system requirements, the first half-wave plate 1, the second half-wave plate 12, the first quarter-wave plate 3, the choosing of the second quarter-wave plate 10
With broadband achromatic waveplate；Convex lens 4 selects K9 glass, focal length 100mm；Concavees lens group 6 be plano-concave lens, material K9 glass,
Focal length -200mm, bore 100mm；Concave mirror 7 is designed as oblate ellipsoid, radius of curvature -350mm；According to calculating, it is incident on
The hot spot bore of concavees lens group 6 needs to reach 55mm, thereby determines that the ideal distance between concavees lens group 6 and convex lens 3 is
800mm；Ensure to be incident on the light of concave mirror 7 along backtracking, concavees lens by focal spot size at detection focus (F)
Group 6 is 170mm with 7 optimum distance of concave mirror.
Experiment shows that the color difference of SG II-5PW system obtains perfect compensation using after apparatus of the present invention correcting chromatic aberration: eventually
End focusing spot diameter is decreased to 5 microns by 50 microns before compensating, and 780nm is differed with 830nm wave to be reduced by 8 λ before compensating
To 0.01 λ, the requirement of system Focal intensity can satisfy.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Thin explanation.It should be understood that above-described is only specific implementation case of the invention, it is not limited to this hair
It is bright.Any modification, equivalent replacement or improvement for being made all within the spirits and principles of the present invention etc., should be included in this hair
Within bright protection scope.
Claims (6)
1. a kind of broad band laser system color difference dynamic compensating device, it is characterised in that: including half-wave plate (1), polarization splitting prism
(2), the first quarter-wave plate (3), convex lens (4), spatial filter (5), concavees lens group (6), concave mirror (7), confession
The first two-dimension translational platform (8) that concavees lens group (6) is placed, the second two-dimension translational platform (9) placed for concave mirror (7), the
Two quarter-wave plates (10), plane mirror (11) and the second half-wave plate (12)；The convex lens (4) and concavees lens group
(6), concave mirror (7) forms confocal system；
Plane of incidence light is changed into P-polarized light by first half-wave plate (1), vertical after polarization spectroscope (2) reflection
The first quarter-wave plate (3) are incident on, after first quarter-wave plate (3) transmission, are converged at altogether by convex lens (4)
Concavees lens group (6) are incident on after spatial filter (5) filtering at the focus (F) of burnt system, it is saturating through concavees lens group (6)
Rear diverging incident is penetrated to concave mirror (7), optical path is along backtracking after concave mirror (7) reflection, successively by recessed
Microscope group (6), spatial filter (5) and convex lens (4) revert to planar light, turn after the first quarter-wave plate (3) transmission
Become S polarized light and through polarization spectroscope (2) transmission after transmitted light by the second quarter-wave plate (10) transmission after vertically
Plane mirror (11) are incident on, along backtracking after the plane mirror (11) reflection, by the second quarter-wave plate
(10) become P-polarized light after again and transmitted after (2) 90 ° of polarization spectroscope reflections by the second half-wave plate (12).
2. a kind of broad band laser system color difference dynamic compensating device according to claim 1, which is characterized in that pass through adjusting
Relative distance between the concavees lens group (6), concave mirror (7) and convex lens (4), can be realized in large bandwidth model
A wide range of interior accurate color difference dynamic in enclosing compensates.
3. a kind of broad band laser system color difference dynamic compensating device according to claim 1, which is characterized in that described
Half of wave plate (1), the second half-wave plate (12), the first quarter-wave plate (3), the second quarter-wave plate (10) are according to actually entering
The case where penetrating light source selects the zero-th order waveplates or achromatic waveplate of corresponding wave band.
4. a kind of broad band laser system color difference dynamic compensating device according to claim 1, which is characterized in that described is recessed
Lens group (6) is designed using simple lens, or uses biconcave lens or more concavees lens combining forms, can be according to incident light source situation
Concavees lens front and rear surfaces plate broadband anti-reflection film.
5. a kind of broad band laser system color difference dynamic compensating device according to claim 1, which is characterized in that described is recessed
Lens group (6) and concave mirror (7) are needed according to real system using spherical design or using aspheric design.
6. a kind of broad band laser system color difference dynamic compensating device according to claim 1, which is characterized in that the sky
Between filter (5) effect be space filtering, prevent near focal point air breakdown, when system power is low, the chamber of spatial filter (5)
Body, which can remove, only retains filtering aperture.
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| CN110262054A (en) * | 2019-06-26 | 2019-09-20 | 中国空间技术研究院 | A kind of broad-band high-resolution Larger Dynamic range compensation of delay system and method |
| CN112630983A (en) * | 2020-12-24 | 2021-04-09 | 中国工程物理研究院激光聚变研究中心 | Laser system, laser-induced damage testing system and method |
| CN112903123A (en) * | 2021-02-01 | 2021-06-04 | 中国科学院上海光学精密机械研究所 | Method and device for measuring single signal-to-noise ratio boost degree of plasma mirror based on synchronous chirp probe pulse |
| CN115473115A (en) * | 2022-08-26 | 2022-12-13 | 中国航空工业集团公司北京长城计量测试技术研究所 | A method and device for generating a concave reflective focused multi-wavelength laser beam |
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| CN115473115A (en) * | 2022-08-26 | 2022-12-13 | 中国航空工业集团公司北京长城计量测试技术研究所 | A method and device for generating a concave reflective focused multi-wavelength laser beam |
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