CN1866037B - A Laser Phase Noise Measuring Device - Google Patents
A Laser Phase Noise Measuring Device Download PDFInfo
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- CN1866037B CN1866037B CN200610012835A CN200610012835A CN1866037B CN 1866037 B CN1866037 B CN 1866037B CN 200610012835 A CN200610012835 A CN 200610012835A CN 200610012835 A CN200610012835 A CN 200610012835A CN 1866037 B CN1866037 B CN 1866037B
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Abstract
一种激光器位相噪声测量装置，包括位相噪声转化装置和平衡零拍探测系统，其特征在于，所述的位相噪声转化装置由偏振分束棱镜(1)、原子气室或分子气室(2)和偏振分束棱镜(3)组成，两束线偏振光经偏振分束棱镜(1)耦合在一起同向传播进入原子气室或分子气室(2)中，在电磁诱导相干效应的作用下将探测光场的位相噪声转化为振幅噪声，并用另一个偏振分束棱镜(3)将探测光和耦合光分开，出射的探测光的振幅噪声用平衡零拍探测系统进行检测。本发明简化了装置，缩短了光路，可集成在一个装置内，具有稳定、便于移动、携带和调试等特点。可广泛应用于量子光学基础实验、量子测量以及量子通讯等领域。
A laser phase noise measurement device, comprising a phase noise conversion device and a balanced zero-beat detection system, characterized in that the phase noise conversion device consists of a polarization beam splitter prism (1), an atomic gas chamber or a molecular gas chamber (2) Composed of a polarizing beam splitting prism (3), the two beams of linearly polarized light are coupled together by the polarizing beam splitting prism (1) and propagate in the same direction into the atomic air cell or molecular air cell (2), under the action of the electromagnetically induced coherence effect The phase noise of the detection light field is converted into amplitude noise, and another polarization beam splitting prism (3) is used to separate the detection light from the coupling light, and the amplitude noise of the outgoing detection light is detected by a balanced zero-beat detection system. The invention simplifies the device, shortens the optical path, can be integrated in one device, and has the characteristics of being stable, easy to move, carry and debug. It can be widely used in basic experiments of quantum optics, quantum measurement, quantum communication and other fields.
Description
Technical field
The present invention relates to a kind of measurement mechanism of laser instrument, specifically is a kind of device that utilizes the coherence effect Laser Measurement device position phase noise of atom or molecule.
Technical background
The position phase noise is one of important indicator of laser instrument.It is the important research object in fields such as quantum optics infrastest, quantum measurement and quantum communication.In the gain media of laser instrument, the position of the photon that spontaneous radiation goes out is unordered at random mutually, and this process has caused the variation of output field intensity, thereby has caused the relaxation oscillation of resonator cavity.Under this frequency, variation has taken place in medium refraction index in the chamber, so the live width of output light is broadened.
Some experimental results show, this position phase noise concentrate on low frequency range (＜1MHz), this mainly is that fluctuating by the shoot laser wavelength causes.The existence that it is found that a phase noise has limited the sensitivity of measuring, and in coherent optical communication system, is the key factor that influences receiver sensitivity.
Numerous studies show that, the position phase noise is for other noise source, contribution to the noise of the laser instrument of a steady operation is maximum, and this also directly affects the interaction process of light and atom, and the analysis of contraposition phase noise and measurement are very significant for this reason.
Measurement to the laser instrument intensity fluctuation can be measured by the balanced system that direct detection or double detector are formed.But the experiment measuring relative complex of contraposition phase noise some, this because of the position phase noise be directly to measure.Any detector institute energy measurement all be light intensity (photon number) and can't directly obtain the phase information of light, so phase measurement needs a kind of device that the position phase noise is converted to intensity noise.The method of measuring the position phase noise at present mainly is an interferometry.
A kind of is the Michelson interferometer mensuration, and it is equivalent to frequency discriminator, and the phase noise of earlier laser instrument being exported light signal is converted into intensity noise, again the photocurrent that detects is carried out spectrum analysis.When the frequency noise that is detected is far longer than intensity noise, generally adopt non-equilibrium mensuration; On the contrary, when intensity noise is big, non-equilibrium mensuration is no longer suitable, just need the balancing a survey method this moment, at this moment need to use two detectors to survey, and photocurrent is subtracted each other, obtain their difference, can get its power spectrum density by spectrum analyzer, thereby obtain the position phase noise of laser instrument.But this method needs long light path, and instrument is not easy of integration, therefore is unfavorable for moving and carrying.Simultaneously, this instrument is had relatively high expectations to the interference degree, regulates and gets up to have certain difficulty.
Also has an interference device of relatively simply realizing phase measurement---F-P interferometer, as shown in Figure 2.Arrive measuring system from the light of F-P interferometer reflection, because the reflection of F-P interferometer is relevant with the incident light frequency, therefore the fluctuating of position phase correspondingly is converted into the part of intensity fluctuation in the reflected light.When F-P interferometer during for the complete off resonance of incident light, if back mirror adopts high reflective cavity mirror, nearly all light all can reflect back the arrival detection system, and the reflected light of this moment will not comprise that any position rises and falls mutually, so intensity noise and shot noise level can be decided easily.In addition, because the F-P interferometer is a dispersion system, its phase noise can be measured in very wide bandwidth range.But,, regulate time-consuming effort again because the fineness of F-P interferometer is very high; And exigent environmental baseline: 1) need accurate temperature controlling usually, this just needs a cover temperature-controlling system again; 2) need the little and hard material F-P cavity of thermal expansivity usually, need the strict high reflective mirror of a pair of plated film.These all can make the measurement mechanism cost increase, and make system's complicated difficult accent that become, and have greatly limited its application.
Summary of the invention
The objective of the invention is for quantum optics infrastest, quantum measure and research field such as quantum communication provide a kind of device simple and easy, regulate phase noise measurer easily, with simplified measurement process and Measuring Time, the reduction experimental cost.
A kind of laser phase noise measurer provided by the present invention, comprise a phase noise reforming unit and balance homodyne detection system, described balanced homodyne detection system is by λ/2 wave plates 4, the 3rd polarization beam splitter prism 5, first low noise detector 6, second low noise detector 7 and adder-subtractor 8 are formed, it is characterized in that, described position phase noise reforming unit is by first polarization beam splitter prism 1, atomic air chamber or molecule air chamber 2 and second polarization beam splitter prism 3 are formed, two bunch polarized lights of laser instrument output enter in atomic air chamber or the molecule air chamber 2 through first polarization beam splitter prism 1 co-propagate that is coupled as surveying light and coupling light respectively, the position phase noise that to survey light field under the effect of electromagnetically induced coherence effect is converted into amplitude noise, and will survey light and coupling light separately with second polarization beam splitter prism 3, the amplitude noise of the detection light of outgoing detects by the balanced homodyne detection system.Be divided into two bundles after promptly surveying light process λ/2 wave plates 4 and the 3rd polarization beam splitter prism 5, rotation λ/2 wave plates 4 make the intensity of two-beam equate, survey with first low noise detector 6, second low noise detector 7 respectively, the signal that detects is input to adder-subtractor 8 does addition and additive operation, the result who obtains is sent into spectrum analyzer 9 observe.
Described atomic air chamber is the vacuum room that is filled with alkaline metal (as lithium, sodium, potassium, rubidium or caesium etc.) or earth alkali metal (as beryllium, magnesium, calcium, strontium or barium etc.).
Described molecule air chamber is to be filled with CO
2, H
2Or NH
3The air chamber of equimolecular gas.
The assembly of described measurement mechanism can be contained on the shockproof platform, and adds a cover casing.
Compared with prior art, advantage of the present invention and effect:
1) the present invention has avoided the cadre enrolled among workers to relate to or transfer the complex operations in chamber, has avoided the stable and temperature control to the chamber simultaneously, has reduced difficulty, has simplified operation, has improved efficient, has reduced cost.
2) the present invention has simplified device, has shortened light path, and can be integrated in the device, is convenient to move, carries and debugs, and has a good application prospect.
3) the present invention measure for quantum optics infrastest, quantum and research field such as quantum communication provide a kind of simple in structure, regulate phase noise measurer easily, but and simplified measurement process and Measuring Time.
Description of drawings
Fig. 1 phase noise measurer synoptic diagram of the present invention
Fig. 2 prior art is utilized F-P interferometer measurement position phase noise synoptic diagram
Atomic energy level structural drawing in Fig. 3 electromagnetically induced coherence effect
Embodiment
Below in conjunction with accompanying drawing phase noise measurer of the present invention is described in further detail.
A kind of phase noise measurer (as shown in Figure 1), constitute a phase noise reforming unit by first polarization beam splitter prism 1, atomic air chamber 2, second polarization beam splitter prism 3, by λ/2 wave plates 4, the 3rd polarization beam splitter prism 5, first low noise detector 6, second low noise detector 7 and adder-subtractor 8 Compositional balance homodyne detection systems.
We are example with the caesium atom, being specifically introduced. the linearly polarized light of two semiconductor laser outputs is not coupled through first polarization beam splitter prism 1 as surveying light and coupling light, wherein the extinction ratio of first polarization beam splitter prism is 25dB, thereby has guaranteed the linear polarization characteristic of two light beams. to survey light and coupling light and enter in the caesium atomic air chamber in the same way and the polarization direction quadrature. and the frequency lock of coupling light is at ground state F=3 (6S
1/2) to excited state F '=3 (6P
3/2) resonant transition on; Survey light frequency then at ground state F=3 (6S
1/2) to excited state F '=3 (6P
3/2) jump frequency near continuous sweep (as shown in Figure 3), caesium atom and two light beams cause surveying light field under the effect of electromagnetically induced transparent (EIT) effect a position phase noise is converted into amplitude noise.Survey light and coupling light by being separated by second polarization beam splitter prism 3 behind the caesium atomic air chamber.Then, survey light again through being divided into two bundles behind λ/2 wave plates 4 and the 3rd polarization beam splitter prism 5, rotation λ/2 wave plates 4 make the intensity of two-beam equate, survey with first low noise detector 6, second low noise detector 7 respectively, the signal that detects is input to adder-subtractor 8 does addition and additive operation, the result who obtains is sent into spectrum analyzer 9 observe.Wherein signal subtraction is as the shot noise benchmark, and signal plus is exactly noise bounce, and it comprises three compositions: amplitude noise that the position phase noise of the amplitude noise of laser, laser changes into and the noise of being introduced by atom.It wherein mainly is the amplitude noise that a phase noise changes into.We have just realized measurement to laser instrument position phase noise with apparatus of the present invention like this.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610012835A CN1866037B (en) | 2006-06-13 | 2006-06-13 | A Laser Phase Noise Measuring Device |
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|---|---|---|---|
| CN200610012835A CN1866037B (en) | 2006-06-13 | 2006-06-13 | A Laser Phase Noise Measuring Device |
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| CN1866037A CN1866037A (en) | 2006-11-22 |
| CN1866037B true CN1866037B (en) | 2010-05-12 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313603B (en) * | 2011-07-07 | 2012-10-17 | 山西大学 | All-fiber pulse-balanced zero-beat detection device |
| CN102435848B (en) * | 2011-11-25 | 2014-01-08 | 中国航天科工集团第二研究院二〇三所 | Comparison device for verifying capacity of phase noise in Ka wave band |
| CN102419398B (en) * | 2011-11-25 | 2013-06-05 | 中国航天科工集团第二研究院二〇三所 | Phase noise capability verification comparison apparatus applied to Ku and K wave band ranges |
| CN104111121B (en) * | 2014-07-30 | 2017-01-11 | 山西大学 | Method for rapidly and accurately adjusting interference of two beams |
| CN105071867B (en) * | 2015-07-14 | 2017-09-26 | 山西大学 | The self balancing control device of time domain impulse balanced homodyne detection device can be achieved |
| CN114172010A (en) * | 2022-01-07 | 2022-03-11 | 中国人民解放军国防科技大学 | Miniaturized integrated probe based on hollow optical fiber atomic air chamber |
| CN115165069B (en) * | 2022-06-14 | 2024-07-23 | 中国船舶重工集团公司第七一五研究所 | An acoustic field measurement array based on quantum weak measurement technology |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5199038A (en) * | 1990-10-09 | 1993-03-30 | Vahala Kerry J | Semiconductor laser noise reduction |
| JPH0735805A (en) | 1993-07-16 | 1995-02-07 | Ando Electric Co Ltd | Measuring apparatus for relative noise intensity of semiconductor laser |
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2006
- 2006-06-13 CN CN200610012835A patent/CN1866037B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5199038A (en) * | 1990-10-09 | 1993-03-30 | Vahala Kerry J | Semiconductor laser noise reduction |
| JPH0735805A (en) | 1993-07-16 | 1995-02-07 | Ando Electric Co Ltd | Measuring apparatus for relative noise intensity of semiconductor laser |
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