CN103324003B - The method and device that the nonlinear optics of low light signals is amplified and signal to noise ratio strengthens - Google Patents
The method and device that the nonlinear optics of low light signals is amplified and signal to noise ratio strengthens Download PDFInfo
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Abstract
The invention provides the method and device that nonlinear optics is amplified and signal to noise ratio strengthens of a kind of low light signals based on partially coherent optical pumping.Tong Bu with flashlight for the pump light of partially coherent incident illumination is sold off nonlinear system by this method, completes amplification and the noise suppression process of weak signal, outputs the amplification optical signal that signal to noise ratio promotes；This device includes lasing light emitter, beam splitter A, partially coherent optical generator, photorefractive nonlinaarity system, high-pressure modular, detector and computer, lasing light emitter sends laser and is divided into two bundles through beam splitter A, beam of laser sells off nonlinear system through partially coherent optical generator incident light, after second bundle laser irradiates remote object, detector is injected after photorefractive nonlinaarity system penetrates, detector is connected with computer, and high-pressure modular is connected with photorefractive nonlinaarity system.The noise that signal is carried by the present invention utilizes, and reduces system noise, improves output signal-to-noise ratio, it is thus achieved that higher gain.
Description
Technical field
The invention belongs to acquisition of signal field, the nonlinear optics being specifically related to low light signals is amplified and letter
Make an uproar than the method and apparatus strengthened.
Background technology
In optical signal prosessing field, under strong noise background, the detection of low light signals is laser radar, spatial light
Communication, air-sea, to application key technologies such as latent communication and optical remote sensing measurements, study high-gain, height
The nonlinear optical amplifying technique of signal to noise ratio has important application value.During the long-distance transmissions of signal,
Signal will necessarily be lost by MEDIUM ABSORPTION AND SCATTERING and die down, and also can be mixed into random noise, is right sometimes
Signal encryption is also specifically added zoop, and therefore the detection of weak signal under strong noise background is just proposed by this
Higher requirement, the most simultaneously effective promotes intensity and the signal to noise ratio of low light signals under strong noise background
Become the key technique in acquisition of signal.Meanwhile, people for the traditional understanding of noise are: make an uproar
Sound is always harmful to.For the detection link of signal, the most so, noise is the biggest more is unfavorable for detection；
But, if noise can play positive role at amplification and the signal to noise ratio hoist links of optical signal, make an uproar by force
Under sound background, Testing of Feeble Signals problem will obtain new breakthrough.The solution of this problem is for military, doctor
The progress in multiple fields such as treatment, communication and technology application are all of great importance.
In photorefractive crystal, Two-beam coupling technology realizes before the amplification of weak signal has the most wide research and application
Scape.Photorefractive effect is to be had been surprisingly found that by AT&T Labs, due to this effect the sixties in 20th century
For nonlocal response, irradiate photorefractive crystal with the laser of milliwatt magnitude and just be enough to produce obvious photic folding
Penetrating rate change, therefore, this low light level effect just causes the great interest of people and generally weighs after being found
Depending on.Current this photorefractive material is in Hologram Storage, light image amplification, phase conjugation and spatial light modulation
Important use is had in field.Photorefractive nonlinaarity system realizes Two-beam coupling light amplification and has the advantage that, the
One, under the conditions of certain parameter, weak signal can be made effectively to be amplified by Two-beam coupling process；The
Two, incident field is simply interfered the spatial intensity distribution obtained sensitive by this non-linear process, therefore may be used
To filter the scattering background optical noise in signal；3rd, this is a kind of low light level non-linear process, if spoke
According to time enough long (increase pumping light intensity and can effectively shorten this time), just be enough to produce the transfer of energy
The low light level is made to amplify.
Electrical and optical two class methods are currently mainly had to realize the amplification of weak signal.First, for electricity side
Method, also can make noise in signal be amplified, the most by force while amplifying signal due to electrical method
Under noise circumstance, conventional electrical method cannot realize the extraction to weak signal and detection especially.Second, for
Optical means, optical means the technology realizing small signals amplification has multiple, brilliant based on photorefractive nonlinaarity
The advantage of body, it is contemplated that utilize Preset grating Two-beam coupling technology to realize the non-linear amplification skill of low light signals
Art, owing to the scattered light in photorefractive crystal while being amplified at flashlight also can extract from pump light
Energy, produces fan-shaped noise (hereafter referred to collectively as system noise), this gain just having influence on signal and output
Signal to noise ratio.At present, both at home and abroad about the master utilizing photorefractive nonlinaarity system to realize high s/n ratio light amplification
Method is wanted to have following several.In order to realize the optical signal amplification of high s/n ratio, traditional method one be take defeated
Enter three beams incoherent light system noise is suppressed, although the output signal of this method can obtain
Higher gain, however it is necessary that two lasing light emitters, and structure is complicated；Traditional method two is to write-wipe repeatedly
The method carried out, this method is the improvement of method one, can obtain more preferable signal to noise ratio and export, but also
Needing to introduce another bundle incoherent light to wipe, structure is more complicated and is difficult to operation.Traditional method three
Being rotating crystal method, this method not only reduces system stability, and output gain signal is relatively low；
Traditional method four is adaptive Wiener filter method, and this method main purpose is suppression noise, but makes an uproar
While sound is inhibited, signal energy also can weaken, in this way and be unfavorable for the spy of small-signal
Survey；Traditional method five is that the low light intensity strong short pulse of write rushes reading method, and this method requires more weak pump light
It is simultaneously written diffracted signal grating with flashlight, does not produce system according to the threshold condition producing system noise
System noise, can export high s/n ratio signal, just because of needs first when high power pulse reads in the short time
Write grating so that this method can not meet the application of signal real-time detection in actual signal detects and want
Ask.The newest method and the proposition of experimental program remain the main path solving this problem, structure
Simply, stable performance, high-gain and high s/n ratio output system are also still that weak signal photorefractive nonlinaarity
Amplifying technique research and the key of application.
Summary of the invention
In order to solve the technical problem exported with high s/n ratio in background technology about the amplification of low light signals,
The nonlinear optics that the invention provides a kind of low light signals based on partially coherent optical pumping is amplified and letter
Make an uproar than the method and device strengthened.
The technical solution adopted in the present invention is:
The method that the nonlinear optics of low light signals is amplified and signal to noise ratio strengthens, it is characterized in that
1] laser that two bundle polarization directions are consistent is produced；
2] beam of laser makes its spatial coherence sexual involution through partially coherent optical generator, obtains part phase
Dry pump light；
3] remote object is detected by the second bundle laser, returns the object information and noisy of carrying
The faint flashlight of sound；
4] regulating step 2] pump light that obtains and step 3] optical path direction of flashlight that obtains and light
Speckle size, makes both synchronize incident illumination and sells off nonlinear system, and give outside the applying of photorefractive nonlinaarity system
Added electric field, completes amplification and the noise suppression process of weak signal, outputs the amplification light that signal to noise ratio promotes
Signal；
5] to step 4] in output signal to noise ratio promote amplification optical signal detect and calculate, it is thus achieved that
Light intensity and signal-tonoise information.
It is also preferred that the left be also disposed with noise in light path between object and photorefractive nonlinaarity system
Generator and the 3rd battery of lens.Noise generating device can be scattering object, it is therefore intended that make flashlight take
Band certain noise, reduces the signal to noise ratio of flashlight, embodies the signal to noise ratio hoisting power of the present invention with this.
It is also preferred that the left be provided with the first battery of lens in the input path of partially coherent optical generator, in part
The second battery of lens it is provided with on the emitting light path of coherent light generator.
It is also preferred that the left above-mentioned steps 3] in before the second bundle laser irradiates object, this Shu Jiguang is declined
Subtract.Decay is to obtain faint optical signal, it is therefore intended that embody next step to faint flashlight
Amplification.
It is also preferred that the left above-mentioned partially coherent optical generator selects clouded glass or voltage modulated liquid crystal display screen.
It is also preferred that the left above-mentioned photorefractive nonlinaarity system is SBN:60 or BaTiO3Or KNSBN or
Person Bi12SiO20。
It is also preferred that the left said method also includes step 6]: by controlling the degree of coherence of pump light or regulating non-
The gain of the electric field strength regulation output signal of linear system and signal to noise ratio.
It is also preferred that the left above-mentioned steps 1] in two bundle laser produced through beam splitter A beam splitting by same lasing light emitter.
The device that the nonlinear optics of low light signals is amplified and signal to noise ratio strengthens, it is characterized in that
Including lasing light emitter, beam splitter A, partially coherent optical generator, photorefractive nonlinaarity system, high-pressure modular,
Detector and computer, lasing light emitter sends laser and is divided into two bundles through beam splitter A, and beam of laser is through portion
Coherent light generator incident light is divided to sell off nonlinear system, after the second bundle laser irradiates remote object,
Through photorefractive nonlinaarity system penetrate after inject detector, detector is connected with computer, high-pressure modular and
Photorefractive nonlinaarity system connects.
Above-mentioned partially coherent optical generator is the clouded glass or voltage modulated liquid crystal display screen rotated.
Above-mentioned photorefractive nonlinaarity system can be SBN:60 or BaTiO3Or KNSBN or
Bi12SiO20；Only need to be for the optical maser wavelength design size of photorefractive nonlinaarity system, doping and cut direction
Etc. parameter.
It is additionally provided with noise generating device between above-mentioned object and photorefractive nonlinaarity system.Noise produces
Device can be scattering object, it is therefore intended that makes flashlight carry certain noise, reduces the signal to noise ratio of flashlight,
The signal to noise ratio hoisting power of the present invention is embodied with this.
Being provided with the first battery of lens in the input path of above-mentioned partially coherent optical generator, partially coherent light is sent out
It is provided with the second battery of lens on the emitting light path of raw device.
It is provided with attenuator in light path between above-mentioned beam splitter A and object.
The principle of the present invention is: based on the Two-beam coupling process in photorefractive crystal, lasing light emitter separate two
Shu Guang, the most a branch of carries out long-range detection as flashlight, and returns the small-signal of Noise；Separately
A branch of pump light through being become partially coherent from computer-controlled partially coherent optical generator；Then connect
The flashlight and the pump light incident illumination that receive are sold off in nonlinear system, and interference also produces modulation light field,
Thus write signal grating, by partially coherent pump light, weak signal light and the phase interaction of nonlinear system
With, complete amplification and the noise suppression process of weak signal.This is a kind of coherent light amplification process, signal
The background noise carried will not obtain gain.Character based on photorefractive nonlinaarity crystal, by controlling pump
The degree of coherence of Pu light makes the gain of output signal and signal to noise ratio can reach an optimum；Again by tune
The electric field strength of joint nonlinear system it is also possible that the signal to noise ratio of output signal to be in another optimal
Value.
The invention have the advantage that
(1) present invention two wave coupling course based on photorefractive nonlinaarity system, uses partially coherent optical pumping
Pu, and the noise carrying signal utilizes, and reduces system noise, improves output signal-to-noise ratio:
First, compared with completely coherent light, owing to the pump light degree of coherence of partially coherent is low, at photorefractive crystal
In less with its scattered light degree of overlapping over time and space, the system noise therefore introduced by it is the least；
Second, the background noise that signal carries can wipe the noise grid produced in crystal to a certain extent, reduces
System noise.
(2) noise that signal carries plays tuning signal in photorefractive nonlinaarity system to a certain extent
The effect of gain so that output signal obtains higher gain.
(3) be prone to debugging, stability is higher, simple in construction, it is not necessary to by introduce incoherent light or
Rotate crystal and reduce system noise.
(4) all there is well amplification for relatively high light signal or the small-signal being submerged in noise
And the raising effect of signal to noise ratio.
Accompanying drawing explanation
The principle framework figure of Fig. 1: the present invention；
The structural representation of Fig. 2: the embodiment of the present invention；
Fig. 3: embodiment of the present invention signal gain and output signal-to-noise ratio change schematic diagram with input signal power；
In Fig. 4: a is the original image signal of embodiment of the present invention theoretical modeling；
B is the weak input signal of Noise；
C-e is the degree of coherence adjusting pump light when changing from small to big, the picture signal of detector output；
F-h is the electric field strength adjusting nonlinear system when changing from small to big, and detector exports
Picture signal；
In Fig. 5: (a) is initial weak light pulses signal；
B () inputs low light signals for the low signal-to-noise ratio after being mixed into noise；
The optical signal of (c) enhancing for obtaining；
Wherein, 1-lasing light emitter；2-beam splitter A；3-the first battery of lens；The clouded glass that 4-rotates；5-second
Battery of lens；6-the first total reflective mirror；7-the second total reflective mirror；8-the 5th battery of lens；The adjustable attenuator of 9-；
10-object；11-beam splitter B；12-scattering object；13-the 3rd battery of lens；14-photorefractive nonlinaarity system；
15-the 4th battery of lens；16-detector；17-high-pressure modular；18-computer.
Detailed description of the invention
The principle of the present invention is: based on the Two-beam coupling process in photorefractive crystal, lasing light emitter 1 separate
Two-beam, the most a branch of carries out long-range detection as flashlight, and returns the small-signal of Noise；
Another bundle becomes the pump light of partially coherent through the partially coherent optical generator controlled from computer 18；So
After the flashlight that receives and pump light incident illumination sell off in nonlinear system, complete the amplification of weak signal with
And noise suppression process.Character based on photorefractive nonlinaarity crystal, by controlling the degree of coherence of pump light
The gain of output signal and signal to noise ratio can reach an optimum；Again by regulation nonlinear system
Electric field strength is it is also possible that the signal to noise ratio of output signal is in another optimum.
Partially coherent light is as the feature that pump light is present invention maximum, and it is for reducing system noise, carrying
Rise output signal-to-noise ratio and serve great role.In photorefractive nonlinaarity crystal, crystal defect cause scattering
The system noise amplifying generation of light, can have a strong impact on signal gain and signal to noise ratio.Use partially coherent light
Pumping, owing to the pump light degree of coherence of partially coherent is low, compared with completely coherent light in photorefractive crystal
Less with the degree of overlapping over time and space of its scattered light, the system noise therefore introduced by it is the most very
Little, thus the energy of pump light can more shift to flashlight, it is achieved the light amplification of high s/n ratio.
Such as the principle framework figure of Fig. 1, the side that the nonlinear optics of low light signals is amplified and signal to noise ratio strengthens
Method, comprises the following steps:
1] laser that two bundle polarization directions are consistent is produced；The energy of beam of laser as pump light, its energy
Amount is more than the energy of the second bundle laser；
2] beam of laser makes its spatial coherence sexual involution through partially coherent optical generator, obtains part phase
Dry pump light；
3] remote object 10 is detected by the second bundle laser, returns and carries object 10 information
And the faint flashlight of Noise；
4] regulating step 2] pump light that obtains and step 3] optical path direction of flashlight that obtains and light
Speckle size, makes both synchronize incident illumination and sells off in nonlinear system, and applies outer powering up to nonlinear system
, complete amplification and the noise suppression process of weak signal, output the amplification optical signal that signal to noise ratio promotes；
In Fig. 2, the adjustment of pump light optical path direction is realized by the first total reflective mirror 6 and the second total reflective mirror 7, light
Speckle size is adjusted and is realized by the 5th battery of lens 8；
5] to step 4] in output signal to noise ratio promote amplification optical signal detect and calculate, it is thus achieved that
Light intensity and signal-tonoise information.
Step 1] in two bundle laser by same lasing light emitter 1 through beam splitter A2 beam splitting produce.
Partially coherent optical generator can select clouded glass 4 or the voltage modulated liquid crystal display screen of rotation, rotation
The clouded glass 4 or the voltage modulated liquid crystal display screen that turn are controlled by computer 18.
Photorefractive nonlinaarity system uses the SBN:60 crystal of 0 ° of cutting 5mm × 5mm × 5mm also
Apply external electric field, it is also possible to select BaTiO3Or KNSBN or Bi12SiO20Deng photorefractive nonlinaarity
System 14, designs the parameters such as crystalline size, doping and cut direction for optical maser wavelength during use.
Step 3] in the second bundle laser irradiate before object 10, this Shu Jiguang is decayed, purpose
It is in order to the intensity of flashlight is controlled, it is thus achieved that faint optical signal, it is simple to next step realizes faint
The amplification of optical signal and signal to noise ratio promote.
Step 3] in the second bundle laser irradiate after object 10, then sequentially pass through noise generating device,
3rd battery of lens 13, arranges noise generating device (such as scattering object 12) purpose and is to make flashlight carry
Certain noise, reduces the signal to noise ratio of flashlight, embodies the signal to noise ratio hoisting power of the present invention with this；3rd
Battery of lens 13 is used for adjusting spot size.
The method also includes step 6]: make the signal to noise ratio of output signal reach by controlling the degree of coherence of pump light
To an optimum, particular by rotating speed or the voltage of voltage modulated liquid crystal display screen of regulation clouded glass；
By the electric field strength of regulation nonlinear system it is also possible that the signal to noise ratio of output signal is in one
Optimum；The two optimum is usually different.
The gain of output signal and signal to noise ratio can not be maximum, for making output signal can obtain one simultaneously
Fixed gain, signal to noise ratio can obtain again preferably lifting, needs equilibrium to consider, obtains an output signal
Optimal contrast.
Present invention also offers the dress that nonlinear optics is amplified and signal to noise ratio strengthens of a kind of low light signals
Put.See Fig. 2, this device mainly include lasing light emitter 1, beam splitter A2, partially coherent optical generator,
Photorefractive nonlinaarity system 14, high-pressure modular 17, detector 16 and computer 18.Lasing light emitter 1 exports
Beam of laser, is divided into two bundles, a branch of (can account for the 90% of gross energy) that wherein energy is more by beam splitter A2
Laser light incident obtains modulation to partially coherent optical generator, the room and time coherence of optical electric field, obtains
The partially coherent pump light that we need；The less beam of laser of energy is as detection light, if desired, warp
After adjustable attenuators 9, object 10 body is irradiated, beam splitter B11 the light conduct reflected away
Detection light, detects object, and the light of return is through scattering object 12, thus carries shot noise, is formed
Carry the low light signals of noise.
Partially coherent pump light and weak signal phototiming incident light sell off nonlinear system 14, inject after injection
Detector 16, the light distribution of detector 16 detectable signal, by gain and the letter of computer export optical signal
Make an uproar ratio situation, evaluate this system disposal ability to low light signals, high-pressure modular 17 and photorefractive nonlinaarity
System connects.
Also it is disposed with noise in light path between object 10 and photorefractive nonlinaarity system and produces dress
Put and the 3rd battery of lens 13.
It is also preferred that the left be provided with the first battery of lens 3 in the input path of partially coherent optical generator, it is used for adjusting
Incide the spot size on partially coherent optical generator, control degree of coherence；Partially coherent optical generator
The second battery of lens 5 it is provided with, for the shaping to outgoing beam, parallel light emergence on emitting light path；Part
The degree of coherence of relevant pump light is by the first battery of lens 3 and partially coherent optical generator co-controlling.
In photorefractive nonlinaarity system, the pump light of partially coherent, weak signal light and nonlinear system are sent out
Raw interaction, on the one hand, the pump light of partially coherent transfers to weak letter by ripple coupling process energy
Number light, it is achieved the amplification of low light signals；On the other hand, regulate pump light degree of coherence, reduce system noise
With control signal gain, the noise simultaneously utilizing signal to carry realizes to a certain extent to flashlight gain
Tuning and the suppression of system noise, complete the enhancing signal output of high s/n ratio.
The clouded glass 4 or voltage modulated liquid crystal display screen rotated selected by partially coherent optical generator.
In photorefractive nonlinaarity system, we use the SBN:60 of 0 ° of cutting 5mm × 5mm × 5mm brilliant
Body also applies external electric field, it is also possible to use such as BaTiO3, KNSBN or Bi12SiO20Non-Deng Preset grating
Linear system, it is only necessary to for optical maser wavelength design crystalline size and the parameter such as doping and cut direction.Also have
The semi-conducting materials such as some CdTe, GaAs can also realize.Powered up by regulation the outer of nonlinear system
Field intensity is so that the signal to noise ratio of output signal is in an optimum.
Detection light, is irradiated object 10, beam splitter B11 in Fig. 2 the light conduct reflected away
Detection light, detects object, and the light of return is through scattering object 12, thus carries shot noise, is formed
Carry the low light signals of noise.
Seeing Fig. 3, wherein curve 1 is the output signal-to-noise ratio change under partially coherent optical pumping, and 2 is signal
Change in gain, 3 output signal-to-noise ratio changes when being to input without pump light.It can be seen that in Preset grating non-thread
In sexual system, increase output signal-to-noise ratio with pump light degree of coherence and gain can not reach optimum simultaneously.Therefore,
Simultaneously take account of the impact of gain and signal to noise ratio, need to regulate extra electric field and pump light degree of coherence make this two
The compromise of the factor of kind, thus export height and identification can strengthen optical signal.
Seeing Fig. 4, the picture signal of the detector 16 of theoretical modeling output is with pump light degree of coherence and additional
Electric field change schematic diagram；Wherein, the weak input signal of a-original image, b-Noise.First, regulation is worked as
When the degree of coherence of partially coherent optical generator changes from small to big, the signal to noise ratio of output image first increases and diminishes afterwards,
This is because along with the increase of pump light degree of coherence, while signal acquisition gain becomes greatly, system noise
Gain also becomes big, i.e. the inhibitory action of system noise is weakened by partially coherent light, and thus output image occurs
(c-e) change；When the electric field strength regulating nonlinear system changes from small to big, space in crystal
The modulation degree of charge field increases, and signal acquisition gain becomes big, but the gain of system noise also becomes big, defeated
The signal to noise ratio of picture of publishing picture first increases and diminishes afterwards, and the change of (f-h) i.e. occurs.Visible, regulation Preset grating is non-
The extra electric field of linear system and degree of coherence both factors of pump light can control the increasing of nonlinear crystal
Benefit coefficient, the amplification optical signal promoted by both factors regulate available signal to noise ratio exports.
Seeing Fig. 5, in figure, (a) is initial weak light pulses signal, is equivalent in device just through attenuator
Signal after 9；B () inputs low light signals for the low signal-to-noise ratio after being mixed into noise, be equivalent to pass through in device
Flashlight after scattering object 12；C () is the optical signal of the enhancing of the output in this device, can be by detector
16 detections.From output and the contrast of input signal, its gain and output signal-to-noise ratio all obtain the biggest
The lifting of amplitude.
Claims (10)
1. the method that the nonlinear optics of low light signals is amplified and signal to noise ratio strengthens, it is characterised in that:
1] lasing light emitter separates the laser that two bundle polarization directions are consistent；
2] beam of laser makes its spatial coherence sexual involution through partially coherent optical generator, obtains part phase
Dry pump light；
3] remote object is detected by the second bundle laser, returns the object information and noisy of carrying
The faint flashlight of sound；
4] regulating step 2] pump light that obtains and step 3] optical path direction of flashlight that obtains and light
Speckle size, makes both synchronize incident illumination and sells off nonlinear system, and give outside the applying of photorefractive nonlinaarity system
Added electric field, completes amplification and the noise suppression process of weak signal, outputs the amplification light that signal to noise ratio promotes
Signal；
5] to step 4] in output signal to noise ratio promote amplification optical signal detect and calculate, it is thus achieved that
Light intensity and signal-tonoise information.
The nonlinear optics amplification of low light signals the most according to claim 1 and signal to noise ratio thereof strengthen
Method, it is characterised in that: also set gradually in the light path between object and photorefractive nonlinaarity system
There are noise generating device and the 3rd battery of lens.
The nonlinear optics amplification of low light signals the most according to claim 1 and signal to noise ratio thereof strengthen
Method, it is characterised in that: in the input path of partially coherent optical generator, it is provided with the first battery of lens,
The emitting light path of partially coherent optical generator is provided with the second battery of lens.
The nonlinear optics amplification of low light signals the most according to claim 1 and signal to noise ratio thereof strengthen
Method, it is characterised in that: above-mentioned steps 3] in the second bundle laser irradiate before object, to this Shu Jiguang
Decay.
5. amplify and signal to noise ratio according to the nonlinear optics of the arbitrary described low light signals of claim 1-4
The method strengthened, it is characterised in that: partially coherent optical generator selects clouded glass or voltage modulated liquid
Brilliant screen；Photorefractive nonlinaarity system is SBN:60 or BaTiO3Or KNSBN or Bi12SiO20。
The nonlinear optics amplification of low light signals the most according to claim 5 and signal to noise ratio thereof strengthen
Method, it is characterised in that: also include step 6]: by controlling degree of coherence or the regulation non-thread of pump light
The gain of the electric field strength regulation output signal of sexual system and signal to noise ratio.
7. the device that the nonlinear optics of low light signals is amplified and signal to noise ratio strengthens, it is characterised in that: bag
Include lasing light emitter, beam splitter A, partially coherent optical generator, photorefractive nonlinaarity system, high-pressure modular,
Detector and computer, lasing light emitter sends laser and is divided into two bundles through beam splitter A, and beam of laser is through portion
Coherent light generator incident light is divided to sell off nonlinear system, after the second bundle laser irradiates remote object,
Through photorefractive nonlinaarity system penetrate after inject detector, detector is connected with computer, high-pressure modular and
Photorefractive nonlinaarity system connects.
The nonlinear optics amplification of low light signals the most according to claim 7 and signal to noise ratio thereof strengthen
Device, it is characterised in that: partially coherent optical generator is the clouded glass or voltage modulated liquid crystal rotated
Screen；Photorefractive nonlinaarity system is SBN:60 or BaTiO3Or KNSBN or Bi12SiO20。
9. amplify according to the nonlinear optics of the low light signals described in claim 7 or 8 and signal to noise ratio increases
Strong device, it is characterised in that: it is additionally provided with noise between object and photorefractive nonlinaarity system and produces
Device.
The nonlinear optics of low light signals the most according to claim 9 is amplified and signal to noise ratio strengthens
Device, it is characterised in that: in the input path of partially coherent optical generator, be provided with the first battery of lens,
The emitting light path of partially coherent optical generator is provided with the second battery of lens.
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| CN105467611B (en) * | 2015-12-30 | 2017-12-19 | 中国科学院西安光学精密机械研究所 | Based on the bistable low light signals reconstruct device of surface plasma |
| CN106338334B (en) * | 2016-09-26 | 2019-01-15 | 中北大学 | A kind of dual-acousto-optic phase modulation conjugation heterodyne detection device |
| CN107024452B (en) * | 2017-04-27 | 2019-11-12 | 河北工业大学 | A kind of real-time monitoring device and method of photorefractive material microcell refractive index |
| CN109242753B (en) * | 2018-08-22 | 2020-09-29 | 中国科学院西安光学精密机械研究所 | Cross modulation instability-based low-light image stochastic resonance reconstruction method and device |
| CN113189566A (en) * | 2021-04-29 | 2021-07-30 | 深圳市京湾量子遥感科技有限公司 | Quantum laser radar system based on quantum light field and control method thereof |
| CN117388861A (en) * | 2023-10-10 | 2024-01-12 | 中国科学院西安光学精密机械研究所 | Weak light signal detection method and system based on phase-sensitive optical parametric amplification |
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| US5006813A (en) * | 1986-02-10 | 1991-04-09 | Rockwell International Corporation | Nonlinear optical doppler imaging amplifier |
| US5282067A (en) * | 1991-10-07 | 1994-01-25 | California Institute Of Technology | Self-amplified optical pattern recognition system |
| CN1580873A (en) * | 2004-05-18 | 2005-02-16 | 西安电子科技大学 | Method for resetting optical grating for analclasis effect application |
| CN101299127A (en) * | 2008-06-13 | 2008-11-05 | 哈尔滨工业大学 | Weak signal amplifier using laminar compound liquid-crystal film and manufacture method thereof |
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2013
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| US5006813A (en) * | 1986-02-10 | 1991-04-09 | Rockwell International Corporation | Nonlinear optical doppler imaging amplifier |
| CN2062842U (en) * | 1989-05-23 | 1990-09-26 | 中国科学院物理研究所 | Signal multiplier for laser spectrometer |
| US5282067A (en) * | 1991-10-07 | 1994-01-25 | California Institute Of Technology | Self-amplified optical pattern recognition system |
| CN1580873A (en) * | 2004-05-18 | 2005-02-16 | 西安电子科技大学 | Method for resetting optical grating for analclasis effect application |
| CN101299127A (en) * | 2008-06-13 | 2008-11-05 | 哈尔滨工业大学 | Weak signal amplifier using laminar compound liquid-crystal film and manufacture method thereof |
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