CN1315005C - Method for resetting optical grating for analclasis effect application - Google Patents
Method for resetting optical grating for analclasis effect application Download PDFInfo
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- CN1315005C CN1315005C CNB2004100261417A CN200410026141A CN1315005C CN 1315005 C CN1315005 C CN 1315005C CN B2004100261417 A CNB2004100261417 A CN B2004100261417A CN 200410026141 A CN200410026141 A CN 200410026141A CN 1315005 C CN1315005 C CN 1315005C
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Abstract
The present invention relates to a method for prearranging optical gratings in photorefractive effect applications. First, prearranged lasers are arranged in different application systems, and prearranged optical gratings are established in photorefractive crystals by regulating prearranged light generated by the prearranged lasers; the prearranged lasers are turned off, and simultaneously, signal light are introduced into applied systems when work is needed; under the action of the incident signal light, the photorefractive crystals respectively realizes the different applications of self-pumped phase conjugation, mutually pumped phase conjugation and photorefractive adaptive optical heterodyne detection in a split second based on the prearranged optical gratings reserved in the photorefractive crystals through the photorefractive effect. The present invention greatly shortens the response time, and can solve the problem of inconvenient application caused by the long response time of photorefractive effect. The present invention can be used in the fields of the photorefractive self-pumped phase conjugation and the photorefractive mutually pumped phase conjugation of phase conjugation lasers, adaptive optics, optical communication and laser gyroscopes, and the photorefractive adaptive optical heterodyne detection of laser communication, radar, heterodyne spectroscopy, etc.
Description
Technical field
The present invention relates to optical technical field, specifically a kind of preset grating method in photorefractive effect application, the light that can be used for fields such as phase-conjugate laser device, adaptive optics, optical communication sells off self pumped phase conjugation and light is sold off mutually pumped phase conjugation, also can be used for the photorefractive adaptive optical heterodyne detection in the fields such as laser communications, radar, heterodyne spectroscopy and laser gyro, and relevant photorefractive effect application field.
Background technology
As everyone knows, the optical heterodyne detection technology is compared with the direct detection technology, has very high detection sensitivity, signal to noise ratio (S/N ratio), so use widely in weak signal is surveyed.But, according to the optical heterodyne detection know-why, in order on the detector photosurface, to obtain effective optical heterodyne, must make the preceding coupling of flashlight and local reference light wave, angle collimation, and maintenance polarization direction unanimity, thereby in actual applications, when particularly the flashlight passage is inhomogeneous, realize that optical heterodyne detection is very difficult.1988, people such as the Shamir of the U.S. are at " Wavefront Conjugation and Amplification for Optical CommunicatinThrough Distorting Media ", Appl.Opt., 1988,27 (14): proposed to utilize light to sell off four-wave mixing, the corrected signal wavefront distortion adaptively of mutually pumped phase conjugation technology in 2912～2914, realized the imagination of optical heterodyne detection.Subsequently, the further research relevant with this technology has: people such as Adamas are at " Wide-Field-of-View Heterodyne Receiver Using aPhotorefractive Double Phase Conjugate Mirror ", Opt.Lett., 1991,16 (11): 330～334 and " AdaptiveSpatially Injection-Locked Heterodyne Receiver ", Opt.Lett., 1993,18 (3): in 226～228 respectively from having illustrated that experimentally this type systematic has wide field-of-view characteristics, the adaptive characteristic that local reference light and the flashlight that contains a large amount of spatial models are complementary; People such as the mistake Ji in the sixth of the twelve Earthly Branches of Xian Electronics Science and Technology University are " light is sold off self-adaptation heterodyne detection systems theory research ", the optics journal, 1995,15 (8): 1132～1135 and " experimental study of photorefractive adaptive optical heterodyne detection ", Chinese laser, 1997, A24 (7), reported in 619～622 that light is sold off from pumping divergence type photorefractive adaptive optical heterodyne detection system of pumping-mutually and light and sold off two pumping type photorefractive adaptive optical heterodyne detection systems mutually, and carried out theory and experimental study; People such as the Shi Shunxiang of Xian Electronics Science and Technology University are in " technical research of Solid State Laser photorefractive adaptive optical heterodyne detection ", the optics journal, 2002,22 (12): proposed a kind of light in 1457～1460 and sold off photorefractive adaptive optical heterodyne detection system, and carried out theory and experimental study from pumping-mutually pumped phase conjugation coexistence type.Existing typical three kinds of photorefractive adaptive optical heterodyne detection technical schemes such as Fig. 6, Fig. 7, shown in Figure 8, especially scheme shown in Figure 8, have simple in structure, easy adjustment, the detection sensitivity height can avoid beam splitter heterodyne system to be introduced advantages such as stray light.Although these existing schemes can realize adaptive optical heterodyne detection, particularly also can realize optical heterodyne detection to the relatively poor solid state laser of coherence, but they all are to utilize photorefractive effect work, utilized all that light is sold off the four-wave mixing phase conjugation, light sells off self pumped phase conjugation or light is sold off mutually pumped phase conjugation, therefore there is a common problem, promptly because of photorefractive effect is a slow-response process, so its work is very long start-up time.Because the response time of photorefractive effect and the light intensity of incoming signal light are inversely proportional to, so for weak signal or low-repetition-frequency, narrow pulse signal, its response time is longer.And long problem of response time will seriously influence the practical application of photorefractive adaptive optical heterodyne detection technology for weak signal and low-repetition-frequency, narrow pulse signal.
Summary of the invention
The objective of the invention is to propose set up in a kind of photorefractive effect application the method for preset grating, slow with the response speed that solves existing photorefractive effect application system, the problem that the responsive operation time is long.
The technical scheme that realizes the object of the invention is that the generation of selling off phase-conjugation light according to light is a principle of setting up phase grating in photorefractive crystal, proposed to utilize the method for preset grating to realize photorefractive effect application, and the method for preset grating is used for different photorefractive effect application fields, comprising self pumped phase conjugation use, mutually pumped phase conjugation is used, photorefractive adaptive optical heterodyne detection is used and other photorefractive effect application.
The technological thought of setting up preset grating in described different photorefractive effect application is:
1. set up preset grating
Sell off in the application system to be provided with at different light and preset laser instrument, and preset the light that presets that laser instrument produces, in photorefractive crystal, set up preset grating by adjustment;
2. introducing flashlight
When needs work, close and preset laser instrument, flashlight is introduced in the applied system simultaneously, in photorefractive crystal, remain with preset grating;
3. utilize the preset grating that keeps to realize different photorefractive effect application
Photorefractive crystal is under the effect of incoming signal light, based on the preset grating that in photorefractive crystal, keeps, by photorefractive effect, can in the extremely short time, realize the different application of self pumped phase conjugation, mutually pumped phase conjugation, photorefractive adaptive optical heterodyne detection respectively.
According to above-mentioned technological thought, can set up to the preset grating method in the different photorefractive effect application, wherein:
In the self pumped phase conjugation photorefractive effect application, set up preset grating step as follows:
I. utilization is preset laser instrument (A) generation and is preset light (1), adjustment is preset light (1) and is incided incident angle and incoming position on the photorefractive crystal (PR1), in photorefractive crystal (PR1), set up the self pumped phase conjugation grating that presets light, and produce the stable self pumped phase conjugation light (4) that presets light:
II. when needs flashlight self pumped phase conjugation is worked, close and preset laser instrument (A), introduce simultaneously signal laser (B) produce, through the flashlight (5) of beam splitter (BS) reflection, incide on the photorefractive crystal (PR1);
III. under the effect of incoming signal light (5), based on the preset grating that keeps in the photorefractive crystal (PR1), pass through photorefractive effect, in photorefractive crystal (PR1), set up the self pumped phase conjugation grating of flashlight (5) apace, and produce the self pumped phase conjugation light (4 ') of flashlight.
In the mutually pumped phase conjugation photorefractive effect application, set up preset grating step as follows:
I. utilize two to preset laser instrument (C ') and (C) produce and to preset light (6) and (7), adjusting this presets light (6) and (7) and incides incident light angle and incoming position on the photorefractive crystal (PR2), in photorefractive crystal (PR2), set up the mutually pumped phase conjugation grating that presets light, and light (6) and (7) mutually pumped phase conjugation light (6 ') and (7 ') are separately preset in generation;
II. when needs flashlight mutually pumped phase conjugation is worked, close and preset laser instrument (C ') and (C), introduce simultaneously by signal laser (E ') with (E) produce, through beam splitter (BS1 ') and flashlight (12) and (13) (BS1) reflected, incide on the photorefractive crystal (PR2);
III. under the effect of incoming signal light (12) and (13), based on the preset grating that keeps in the photorefractive crystal (PR2), pass through photorefractive effect, in photorefractive crystal (PR2), set up the mutually pumped phase conjugation grating of flashlight apace, and produce mutually pumped phase conjugation light (12 ') and (13 ') of flashlight (12) and (13) self.
The step of setting up preset grating in the photorefractive adaptive optical heterodyne detection photorefractive effect application is as follows:
I. be provided with flashlight (18) independently co-wavelength preset laser instrument (F), produce and to preset light (14) by presetting laser instrument (F) through beam splitter (BS2) transmission, it is identical with the incident parameter of flashlight (18) to adjust this incident parameter that presets light (14), make and preset local reference light (15) that light (14) produces with local laser instrument (H) and sell off at light and set up the photorefractive adaptive optical heterodyne detection preset grating in the self-adaptation heterodyne system, and produce output light (16) and (17) preset light, this output light (16) and (17) is with equidirectional, mode with wavefront is injected on the detector (D), produces the optical heterodyne output signal that presets light (14);
II. when needs adaptive optical heterodyne detection flashlight, close and preset laser instrument (F), will incide light and sell off in the self-adaptation heterodyne system by signal laser (G) generation, through the flashlight (18) of beam splitter (BS2) reflection simultaneously;
III. under the effect of flashlight (18), sell off photorefractive adaptive optical heterodyne detection preset grating in the self-adaptation heterodyne system based on being retained in light, pass through photorefractive effect, sell off the photorefractive adaptive optical heterodyne detection grating of setting up flashlight (18) in the self-adaptation heterodyne system apace at light, and the output light (19) and (20) that produce flashlight, this output light (19) and (20) with equidirectional, be injected on the detector (D) with the mode of wavefront, produce the optical heterodyne output signal of flashlight (18);
Described light is sold off the self-adaptation heterodyne system and is comprised from the pumping divergence type system of pumping-mutually, two mutual pumping type system, from the pumping coexistence type system of pumping-mutually.
The present invention has following advantage:
(1) sells off self pumped phase conjugation with respect to common light and light is sold off mutually pumped phase conjugation, by suitably selecting to preset light intensity, set up the preset grating self pumped phase conjugation and the preset grating mutually pumped phase conjugation of suitable preset grating intensity, can shorten the response time greatly, solved because of light and sold off work long problem start-up time that low-response causes, its operating characteristic is unaffected fully.
(2) with respect to common adaptive photoheterodyne method for detecting light refraction, by setting up suitable preset grating intensity, can shorten the response time greatly, solve because of light and sold off work long problem start-up time that low-response causes, its adaptive optical heterodyne detection characteristic is unaffected fully.Be particularly suitable for the practical application of weak signal and low-repetition-frequency, narrow pulse signal, make the actual detection of weak signal and low-repetition-frequency, narrow pulse signal, also can adopt adaptive photoheterodyne method for detecting light refraction.
(3) preset grating method that proposes among the present invention, more generally be applicable to technology and practical application that all utilize photorefractive effect, it can solve many application inconvenience problems of bringing because of the photorefractive effect response time is long, photorefractive effect application for utilizing photorefractive crystal has important and practical meanings.
Description of drawings
Fig. 1 is a preset grating self pumped phase conjugation schematic diagram of the present invention
Fig. 1 (a) presets the light situation different with signal light wavelength
Fig. 1 (b) presets the light situation identical with signal light wavelength
Fig. 2 is a preset grating mutually pumped phase conjugation schematic diagram of the present invention
Fig. 2 (a) presets the light situation different with signal light wavelength
Fig. 2 (b) presets the light situation identical with signal light wavelength
Fig. 3 is a preset grating photorefractive adaptive optical heterodyne detection schematic diagram of the present invention
Fig. 3 (a) is the situation that general light is sold off the self-adaptation heterodyne system
Fig. 3 (b) is the situation from pumping-mutual pumping divergence type light is sold off the self-adaptation heterodyne system
Fig. 3 (c) is the situation that two pumping type light are mutually sold off the self-adaptation heterodyne system
Fig. 3 (d) is the situation from pumping-mutual pumping coexistence type light is sold off the self-adaptation heterodyne system
Fig. 4 is the output signal diagram of preset grating photorefractive adaptive optical heterodyne detection experiment of the present invention
Fig. 5 is the output characteristics figure of preset grating photorefractive adaptive optical heterodyne detection experiment of the present invention
Fig. 6 be that the sixth of the twelve Earthly Branches, people such as Ji proposed from the pumping divergence type photorefractive adaptive optical heterodyne detection system diagram of pumping-mutually
Fig. 7 was two pumping type photorefractive adaptive optical heterodyne detection system diagrams mutually that the sixth of the twelve Earthly Branches, people such as Ji proposed
Fig. 8 be people such as Shi Shunxiang propose from the pumping coexistence type photorefractive adaptive optical heterodyne detection system diagram of pumping-mutually
Embodiment
Below the preset grating method that present invention will be described in detail with reference to the accompanying:
With reference to Fig. 1, self pumped phase conjugation preset grating method of the present invention is carried out as follows:
1. set up preset grating
If it is different with flashlight 5 to preset the wavelength of light 1, then shown in Fig. 1 (a), incident angle θ and incoming position x according to photorefractive crystal characteristic and flashlight 5, careful incident angle and the incoming position that presets light 1 relative photorefractive crystal PR1 of adjusting makes it set up suitable self pumped phase conjugation preset grating in photorefractive crystal PR1; If it is identical with flashlight 5 to preset the wavelength of light 1, then shown in Fig. 1 (b), careful incident angle and the incoming position that presets light 1 relative photorefractive crystal PR1 of adjusting makes its incident angle θ with flashlight 5 identical with incoming position x, sets up the self pumped phase conjugation preset grating in photorefractive crystal.Correspondingly, the light in photorefractive crystal PR1 is 2,3,2 ', 3 ', and produce the phase-conjugation light 4 that presets light 1.According to the power of working signal light 5, should select the suitable intensity that presets light 1, roughly the same from pumping preset grating intensity and flashlight that makes that it sets up from the pumping grating intensity;
2. introducing flashlight
When needs flashlight self pumped phase conjugation is worked, close and preset laser instrument A, introduce simultaneously signal laser B produce, through the flashlight 5 of beam splitter BS reflection, incide on the photorefractive crystal PR1 with incident angle θ, incoming position x, in photorefractive crystal PR1, remain with preset grating;
3. the self pumped phase conjugation light of output signal light
Photorefractive crystal PR1 is under the effect of incoming signal light 5, based on the preset grating that is retained among the photorefractive crystal PR1, by photorefractive effect, can be in the extremely short time, set up the self pumped phase conjugation grating of flashlight 5, the self pumped phase conjugation light 4 of generation flashlight 5 '.And, from the pumping preset grating distribute with flashlight from the pumping grating distribute much the same, from pumping preset grating intensity and flashlight when the pumping grating intensity is roughly the same, the response time of preset grating self pumped phase conjugation is the shortest.
Self pumped phase conjugation preset grating method most preferred embodiment of the present invention adopts the light situation identical with signal light wavelength that preset shown in Fig. 1 (b).Its input signal light 5 is that average light power is that 0.96mW, pulsewidth are that 30nS, repetition frequency are the pulsed modulation light of 80Hz.When flashlight acts on separately when promptly not having preset grating on the photorefractive crystal PR1, form stable self pumped phase conjugation light and need 30 minutes, and be that the light that presets of 1mW is set up when presetting the self pumped phase conjugation grating when choosing luminous power, same pulse-modulated signal light 5 was exportable stable self pumped phase conjugation light in 4 minutes; Presetting luminous power when employing is 2.38mW when setting up preset grating, and forming the stable self pumped phase conjugation light output of pulse light needs 7 minutes.Experiment showed, the generation time that adopts preset grating method can reduce the self pumped phase conjugation light of low repeatability, narrow pulse signal light greatly.Further, investigate the experimental result of preset grating self pumped phase conjugation optical distortion correction characteristic, time-domain information transport property, phase conjugation reflection characteristic, can confirm it and not adopt self pumped phase conjugation optical distortion correction characteristic, time-domain information transport property, the phase conjugation reflection characteristic of preset grating method identical, promptly preset grating method does not influence the self pumped phase conjugation characteristic fully.
With reference to Fig. 2, mutually pumped phase conjugation preset grating method of the present invention is carried out as follows:
1. set up preset grating
If by preset that laser instrument C ', C produce to preset light 6 different with the wavelength of flashlight 12 and 13 with 7 wavelength, then shown in Fig. 2 (a), beam intensity ratio according to photorefractive crystal characteristic and incident binary signal light, incident light angle , incoming position x, the careful adjustment preset beam intensity ratio, incident light angle and the incoming position of light 6 and 7, makes it set up suitable mutually pumped phase conjugation preset grating in photorefractive crystal PR2; If it is identical with the wavelength of flashlight 12 and 13 with 7 wavelength to preset light 6, then shown in Fig. 2 (b), the careful adjustment preset beam intensity ratio, incident light angle and the incoming position of light 6 and 7, make its beam intensity ratio, incident light angle identical, in photorefractive crystal, set up the mutually pumped phase conjugation preset grating with incoming position x with flashlight 12 and 13.Correspondingly, the light in photorefractive crystal PR2 is 8,9,10,11, and produce the mutually pumped phase conjugation light 6 preset light 6 and 7 ' and 7 '.According to the power of working signal light, should select the suitable intensity that presets light 6 and 7, make the mutual pumping grating intensity of its mutual pumping preset grating intensity set up and flashlight roughly the same;
2. introducing flashlight
When needs flashlight mutually pumped phase conjugation is worked, close and preset laser instrument C ' and C, introduce flashlight 12 and 13 simultaneously, incide on the photorefractive crystal PR2 with incident light angle , incoming position x, in photorefractive crystal PR2, remain with preset grating;
3. the mutually pumped phase conjugation light of output signal light
Photorefractive crystal PR2 is under the effect of incoming signal light 12 and 13, based on the preset grating that is retained among the photorefractive crystal PR2, pass through photorefractive effect, can be in the extremely short time, set up the mutually pumped phase conjugation grating of flashlight, and the mutually pumped phase conjugation light 12 of generation flashlight 12 and 13 ' and mutually pumped phase conjugation light 13 '.
The most preferred embodiment of mutually pumped phase conjugation preset grating method of the present invention is selected the light situation identical with signal light wavelength that preset shown in Fig. 2 (b) for use.The beam intensity ratio of two incident pulse modulation signal light is that 1: 1, pulsewidth are that 30ns, repetition frequency are that 80Hz, average power are 0.96mW.When not adopting preset grating method, two flashlights act on separately on the photorefractive crystal PR2, producing stable mutually pumped phase conjugation light required time is 50 minutes, and adopt beam intensity ratio is 1: 1, power is that two of 1.4mW preset light and set up in crystal when presetting the mutually pumped phase conjugation grating, two same incident pulse modulation signal light actions are on photorefractive crystal PR2, and the time that produces stable mutually pumped phase conjugation light is about 15 minutes; When adopting luminous power is two of 1mW when presetting light and setting up mutual pumping preset grating, and the time that produces stable mutually pumped phase conjugation light needs is about 10 minutes.Experiment showed, the generation time that adopts preset grating method can reduce the mutually pumped phase conjugation light of low repeatability, narrow pulse signal light greatly.Further, investigate the experimental result of preset grating mutually pumped phase conjugation optical distortion correction characteristic, time-domain information transport property, phase conjugation reflection characteristic, can confirm it and not adopt mutually pumped phase conjugation optical distortion correction characteristic, time-domain information transport property, the phase conjugation reflection characteristic of preset grating method identical, promptly preset grating method does not influence the mutually pumped phase conjugation characteristic fully.
With reference to Fig. 3, can make detailed explanation to photorefractive adaptive optical heterodyne detection preset grating method of the present invention, wherein, Fig. 3 (a) is the schematic diagram of the preset grating method of various photorefractive adaptive optical heterodyne detection system schemas.Light among Fig. 3 (a) is sold off the self-adaptation heterodyne system and is comprised from the pumping divergence type system of pumping-mutually, two mutual pumping type system, from the pumping coexistence type system of pumping-mutually; Local laser instrument H is local reference light source; D is the heterodyne signal detector.
Step with reference to Fig. 3 (a) photorefractive adaptive optical heterodyne detection preset grating method is:
1. set up preset grating
By with flashlight independently co-wavelength preset laser instrument F and produce, preset light 14 by beam splitter BS2 transmission again, inject light with the incident parameter identical and sell off the self-adaptation heterodyne system with flashlight 18, the local reference light 15 that produces with local laser instrument H is sold off at light and is set up the photorefractive adaptive optical heterodyne detection grating that presets in the self-adaptation heterodyne system, and the corresponding output of generation light 16 and 17, they with equidirectional, be injected on the detector D with the mode of wavefront, produce the heterodyne output signal that presets light 14;
2. introducing flashlight
When needs adaptive optical heterodyne detection flashlight, close and preset laser instrument F, to produce, pass through the flashlight 18 of beam splitter BS2 reflection by signal laser G simultaneously, incide light and sell off in the self-adaptation heterodyne system, sell off the preset grating that remains with photorefractive adaptive optical heterodyne detection in the self-adaptation heterodyne system at light;
3. export stable optical heterodyne signal
Light is sold off the self-adaptation heterodyne system under the effect of flashlight 18, sell off photorefractive adaptive optical heterodyne detection preset grating in the self-adaptation heterodyne system based on being retained in light, pass through photorefractive effect, can be in the extremely short time, sell off the photorefractive adaptive optical heterodyne detection grating of setting up flashlight 18 in the self-adaptation heterodyne system at light, and the corresponding output of generation light 19 and 20, this output light 19 and 20 with equidirectional, be injected on the detector D with the mode of wavefront, produce the optical heterodyne output signal of flashlight 18.
With reference to Fig. 3 (b), sell off the self-adaptation heterodyne system for the time when light from the pumping divergence type photorefractive adaptive optical heterodyne detection system of pumping-mutually, the step of its preset grating method is:
1. set up preset grating
By with flashlight independently co-wavelength preset laser instrument F and produce, preset light 14 by beam splitter BS2 transmission again, introduce with the incident parameter identical with flashlight 18, preset light 14 and in photorefractive crystal PR3, set up the self pumped phase conjugation grating that presets, and produce self pumped phase conjugation light 24 by the transmitted light 23 of beam splitter BS3; Preset light 14 and in photorefractive crystal PR4, set up the mutually pumped phase conjugation grating that presets with the local reference light 15 that local laser instrument H produces, and produce mutually pumped phase conjugation light 22 by the reflected light 21 of beam splitter BS3.Self pumped phase conjugation light 24 by produce behind the beam splitter BS3 reflected light 16 ', mutually pumped phase conjugation light 22 by produce behind the beam splitter BS3 transmitted light 17 ', this reflected light 16 ' and transmitted light 17 ' with equidirectional, be injected on the detector D with the mode of wavefront, produce the optical heterodyne output signal that presets light 14;
2. introducing flashlight
When needs adaptive optical heterodyne detection flashlight, close and preset laser instrument F, introduce the flashlight 18 that produces and pass through beam splitter BS2 reflection by signal laser G simultaneously, in photorefractive crystal PR3 and photorefractive crystal PR4, remain with self pumped phase conjugation preset grating and mutually pumped phase conjugation preset grating respectively;
3. export stable optical heterodyne signal
With reference to Fig. 3 (c), when light was sold off the self-adaptation heterodyne system for two pumping type photorefractive adaptive optical heterodyne detection system mutually, the step of its preset grating method was:
1. set up preset grating
By with flashlight independently co-wavelength preset laser instrument F and produce, preset light 14 by beam splitter BS2 transmission again, introduce with the incident parameter identical with flashlight 18, preset reflected light 21 by beam splitter BS4 of light 14 ' with the transmitted light 15 of the local reference light 15 that produces by local laser instrument H through beam splitter BS5 "; in photorefractive crystal PR6, set up the mutually pumped phase conjugation grating that presets light, and generation mutually pumped phase conjugation light 22 '; Reflected light 15 by beam splitter BS5 of the transmitted light 29 of mutually pumped phase conjugation light 22 ' by beam splitter BS4 and local reference light 15 ', in photorefractive crystal PR5, set up the mutually pumped phase conjugation grating that another presets, and produce mutually pumped phase conjugation light 30.Preset the transmitted light 16 that light 14 produces through beam splitter BS4 " and mutually pumped phase conjugation light 30 produce reflected light 17 " by beam splitter BS4, with equidirectional, be injected on the detector D with the mode of wavefront, produce the optical heterodyne output signal that presets light 14;
2. introducing flashlight
When needs adaptive optical heterodyne detection flashlight, close and preset laser instrument F, introduce the flashlight 18 that produces and pass through beam splitter BS2 reflection by signal laser G simultaneously, in photorefractive crystal PR5 and photorefractive crystal PR6, remain with the mutually pumped phase conjugation preset grating respectively;
3. export stable optical heterodyne signal
With reference to Fig. 3 (d), sell off the self-adaptation heterodyne system for the time when light from the pumping coexistence type photorefractive adaptive optical heterodyne detection system of pumping-mutually, the step of its preset grating method is:
1. set up preset grating
By with flashlight independently co-wavelength preset laser instrument F and produce, preset light 14 by beam splitter BS2 transmission again, introduce with the incident parameter identical with flashlight 18, preset the reflected light 21 of light 14 by beam splitter BS6 " in photorefractive crystal PR7, set up self pumped phase conjugation and the mutually pumped phase conjugation coexistence grating that presets with the local reference light 15 that local laser instrument H produces; and produce self pumped phase conjugation light 32 and mutually pumped phase conjugation light 22 ", this self pumped phase conjugation light 32 and mutually pumped phase conjugation light 22 " produce self pumped phase conjugation transmitted light 16 and mutually pumped phase conjugation transmitted light 17 that preset light by beam splitter BS6 respectively; they are with equidirectional; the mode with wavefront is injected on the detector D, produce the optical heterodyne output signal that presets light 14;
2. introducing flashlight
When needs adaptive optical heterodyne detection flashlight, close and preset laser instrument F, introduce by signal laser G producing and flashlight 18 by the BS2 reflection simultaneously, in photorefractive crystal PR7, remain with self pumped phase conjugation and mutually pumped phase conjugation coexistence preset grating;
3. export stable optical heterodyne signal
The reflected light 25 that flashlight 18 produces by beam splitter BS6 " incides on the photorefractive crystal PR7; on the basis of presetting self pumped phase conjugation and mutually pumped phase conjugation coexistence grating that keeps in photorefractive crystal PR7; pass through photorefractive effect; can be in the extremely short time; set up the self pumped phase conjugation and the mutually pumped phase conjugation coexistence stationary raster of flashlight; also produce the self pumped phase conjugation light 33 and the mutually pumped phase conjugation light 26 of flashlight respectively ", this two light produces self pumped phase conjugation transmitted light 19 and mutually pumped phase conjugation transmitted light 20 respectively by beam splitter BS6, they are with equidirectional, form with wavefront is injected on the detector D, produces the optical heterodyne output signal of flashlight 18.
The most preferred embodiment that the present invention selects for use in the photorefractive adaptive optical heterodyne detection preset grating method is the described situation of selling off the self-adaptation heterodyne system from the pumping divergence type light of pumping-mutually of Fig. 3 (b).Wherein select for use to preset luminous power from pumping be 2.38mW, it is 1.4mW that luminous power is preset in mutual pumping, the incoming signal luminous power is 0.96mW, then produce of the generation time decision of the time of stable output optical heterodyne signal by preset grating mutually pumped phase conjugation light, be about 15 minutes, the output optical heterodyne signal that is produced as shown in Figure 4, this Fig. 4 is the frequency difference of flashlight and local reference light when being 50MHz, the outer time dependent sinusoidal signal of potential difference of the 50MHz that experiment measuring arrives.And utilize power to realize photorefractive adaptive optical heterodyne detection separately for the incoming signal light of 0.96mW, when promptly not adopting the method for preset grating, the time that produces stable output optical heterodyne signal is about 50 minutes.The photorefractive adaptive optical heterodyne detection characteristic of employing preset grating method as shown in Figure 5, this Fig. 5 shows that for the output heterodyne signal voltage of optical heterodyne detection experiment and the luminous power relation curve of local reference light, this relation curve the luminous power of output heterodyne signal voltage amplitude and local reference light is square root relationship.The experimental features and the theoretical analysis result of the photorefractive adaptive optical heterodyne detection of this specific character when not adopting preset grating method are identical.
By Fig. 4 and Fig. 5 as seen, use the inventive method greatly to shorten the responsive operation time of photorefractive adaptive optical heterodyne detection, and do not influence its output characteristics fully.
Claims (8)
1. method of in the self pumped phase conjugation photorefractive effect application, setting up preset grating, step is as follows:
I. utilization is preset laser instrument (A) generation and is preset light (1), adjustment is preset light (1) and is incided incident angle and incoming position on the photorefractive crystal (PR1), in photorefractive crystal (PR1), set up the self pumped phase conjugation grating that presets light, and produce stable preset grating self pumped phase conjugation light (4);
II. when needs flashlight self pumped phase conjugation is worked, close and preset laser instrument (A), introduce simultaneously signal laser (B) produce, through the flashlight (5) of beam splitter (BS) reflection, incide on the photorefractive crystal (PR1);
III. under the effect of incoming signal light (5), based on the preset grating that keeps in the photorefractive crystal (PR1), pass through photorefractive effect, in photorefractive crystal (PR1), set up the self pumped phase conjugation grating of flashlight (5) apace, and produce the self pumped phase conjugation light (4 ') of flashlight.
2. method of in the mutually pumped phase conjugation photorefractive effect application, setting up preset grating, step is as follows:
I. utilize two to preset laser instrument (C ') and (C) produce and to preset light (6) and (7), adjusting this presets light (6) and (7) and incides incident light angle and incoming position on the photorefractive crystal (PR2), in photorefractive crystal (PR2), set up the mutually pumped phase conjugation grating that presets light, and light (6) and (7) mutually pumped phase conjugation light (6 ') and (7 ') are separately preset in generation;
II. when needs flashlight mutually pumped phase conjugation is worked, close and preset laser instrument (C ') and (C), introduce simultaneously by signal laser (E ') with (E) produce, through beam splitter (BS1 ') and flashlight (12) and (13) (BS1) reflected, incide on the photorefractive crystal (PR2);
III. under the effect of incoming signal light (12) and (13), based on the preset grating that keeps in the photorefractive crystal (PR2), pass through photorefractive effect, in photorefractive crystal (PR2), set up the mutually pumped phase conjugation grating of flashlight apace, and produce mutually pumped phase conjugation light (12 ') and (13 ') of flashlight (12) and (13) self.
3. method of in the photorefractive adaptive optical heterodyne detection photorefractive effect application, setting up preset grating, step is as follows:
I. be provided with flashlight (18) independently co-wavelength preset laser instrument (F), produce by presetting laser instrument (F), preset light (14) through beam splitter (BS2) transmission, it is identical with the incident parameter of flashlight (18) to adjust this incident parameter that presets light (14), make and preset local reference light (15) that light (14) produces with local laser instrument (H) and sell off at light and set up the photorefractive adaptive optical heterodyne detection preset grating in the self-adaptation heterodyne system, and produce output light (16) and (17) preset light, this output light (16) and (17) is with equidirectional, mode with wavefront is injected on the detector (D), produces the optical heterodyne output signal that presets light (14);
II. when needs adaptive optical heterodyne detection flashlight, close and preset laser instrument (F), will incide light and sell off in the self-adaptation heterodyne system by signal laser (G) generation, through the flashlight (18) of beam splitter (BS2) reflection simultaneously;
III. under the effect of flashlight (18), sell off photorefractive adaptive optical heterodyne detection preset grating in the self-adaptation heterodyne system based on being retained in light, pass through photorefractive effect, sell off the photorefractive adaptive optical heterodyne detection grating of setting up flashlight (18) in the self-adaptation heterodyne system apace at light, and the output light (19) and (20) that produce flashlight, this output light (19) and (20) with equidirectional, be injected on the detector (D) with the mode of wavefront, produce the optical heterodyne output signal of flashlight (18);
Described light is sold off the self-adaptation heterodyne system and is comprised from the pumping divergence type system of pumping-mutually, two mutual pumping type system, from the pumping coexistence type system of pumping-mutually.
4. according to claims 1 described method of in the self pumped phase conjugation photorefractive effect application, setting up preset grating, it is characterized in that the adjustment of self pumped phase conjugation preset grating, be to preset light (1) to incide incident angle and incoming position on the photorefractive crystal (PR1), carry out with the wavelength relationship of flashlight (5) according to presetting light (1): if it is different with the wavelength of flashlight (5) to preset light (1), can be according to the incident angle (θ) of flashlight (5), incoming position (x), adjustment is preset light (1) and is incided incident angle and incoming position on the photorefractive crystal (PR1), makes the self pumped phase conjugation grating of its self pumped phase conjugation grating that presets and flashlight basic identical; If it is identical with flashlight (5) to preset the wavelength of light (1), then according to incident angle (θ), the incoming position (x) of flashlight (5), the incident angle and the incoming position of light (1) preset in adjustment, makes the self pumped phase conjugation grating of the self pumped phase conjugation grating that presets light and flashlight identical.
5. according to claims 2 described methods of in the mutually pumped phase conjugation photorefractive effect application, setting up preset grating, it is characterized in that the adjustment of mutually pumped phase conjugation preset grating, be to preset light (6) and (7) to incide incident light angle and incoming position on the photorefractive crystal (PR2), carry out with the wavelength relationship of flashlight (12) and (13) with (7) according to presetting light (6): if it is different with the wavelength of flashlight (12) and (13) with (7) to preset light (6), can be according to the incident light angle () of flashlight (12) and (13), incoming position (x), adjustment is preset light (6) and (7) and is incided incident light angle and incoming position on the photorefractive crystal (PR2), makes the mutually pumped phase conjugation grating of the mutually pumped phase conjugation grating that presets light and flashlight basic identical; If it is identical with (13) with flashlight (12) to preset the wavelength of light (6) and (7), then preset the incident light angle and the incoming position of light (6) and (7) by adjustment, (x) is identical to make incident light angle (), the incoming position of itself and flashlight (12) and (13).
6. according to claims 3 described methods of in the photorefractive adaptive optical heterodyne detection photorefractive effect application, setting up preset grating, it is characterized in that the photorefractive adaptive optical heterodyne detection system for when the pumping divergence type system of pumping-mutually, the process of preset grating is as follows:
Setting and flashlight independently co-wavelength preset laser instrument (F), on the direction of flashlight (18), produce and preset light (14) through beam splitter (BS2) transmission, the incident parameter that light (14) is preset in adjustment is identical with the incident parameter of flashlight (18), preset light (14) and in photorefractive crystal (PR3), set up the self pumped phase conjugation grating that presets, and produce self pumped phase conjugation light (24) by the transmitted light (23) of beam splitter (BS3); Preset light (14) and in photorefractive crystal (PR4), set up the mutually pumped phase conjugation grating that presets with the local reference light (15) that local laser instrument (H) produces, and produce mutually pumped phase conjugation light (22) by the reflected light (21) of beam splitter (BS3);
Self pumped phase conjugation light (24) produces reflected light (16 ') by beam splitter (BS3), mutually pumped phase conjugation light (22) produces transmitted light (17 ') by beam splitter (BS3), this reflected light (16 ') and transmitted light (17 ') with equidirectional, be injected on the detector (D) with the mode of wavefront, produce the optical heterodyne output signal that presets light (14);
When needs adaptive optical heterodyne detection flashlight, close and preset laser instrument (F), introduce the flashlight (18) that produces and pass through beam splitter (BS2) reflection by signal laser (G);
Flashlight (18) produces transmitted light (27) and reflected light (25) by beam splitter (BS3), what this transmitted light (27) and reflected light (25) kept in photorefractive crystal (PR3) respectively presets on the basis of presetting the mutually pumped phase conjugation grating that keeps in self pumped phase conjugation grating and the photorefractive crystal (PR4), pass through photorefractive effect, at (PR3) with set up the self pumped phase conjugation stationary raster and the mutually pumped phase conjugation stationary raster of flashlight (PR4) apace, and the self pumped phase conjugation light (28) and the mutually pumped phase conjugation light (26) of generation flashlight, the self pumped phase conjugation light (28) of this flashlight and mutually pumped phase conjugation light (26), form reflected light (19 ') and transmitted light (20 ') by beam splitter (BS3) back, this reflected light (19 ') and transmitted light (20 ') are with equidirectional, inject on the detector (D) with the mode of wavefront, export the optical heterodyne signal of stable flashlight.
7. according to claims 3 described methods of setting up preset grating in the photorefractive adaptive optical heterodyne detection photorefractive effect application, when it is characterized in that the photorefractive adaptive optical heterodyne detection system for two pumping type system mutually, the process of preset grating is as follows:
Laser instrument (F) is preset in setting, on the direction of flashlight (18), produce and preset light (14) through beam splitter (BS2) transmission, the incident parameter that light (14) is preset in adjustment is identical with the incident parameter of flashlight (18), make preset the reflected light (21 ') of light (14) by beam splitter (BS4) and the local reference light (15) that produces by local laser instrument (H) through the transmitted light of beam splitter (BS5) (15 "); in photorefractive crystal (PR6), set up the mutually pumped phase conjugation grating that presets, and produce mutually pumped phase conjugation light (22 '); Mutually pumped phase conjugation light (22 ') is by the transmitted light (29) and the reflected light (15 ') of local reference light (15) by beam splitter (BS5) of beam splitter (BS4), in photorefractive crystal (PR5), set up the mutually pumped phase conjugation grating that another presets, and produce mutually pumped phase conjugation light (30);
Preset reflected light by beam splitter (BS4) generation of transmitted light (16 ") that light (14) produces through beam splitter (BS4) and mutually pumped phase conjugation light (30) (17 "), with equidirectional, be injected on the detector (D) with the mode of wavefront, produce the optical heterodyne output signal that presets light (14);
When needs adaptive optical heterodyne detection flashlight, close and preset laser instrument (F), introduce the flashlight (18) that produces and pass through beam splitter (BS2) reflection by signal laser (G);
After flashlight (18) produces reflected light (25 ') by beam splitter (BS4), what keep in photorefractive crystal (PR6) respectively presets on the basis of presetting the mutually pumped phase conjugation grating that keeps in mutually pumped phase conjugation grating and the photorefractive crystal (PR5), pass through photorefractive effect, apace at photorefractive crystal (PR6) with set up two mutually pumped phase conjugation stationary rasters of flashlight (PR5), produce the mutually pumped phase conjugation light (26 ') of flashlight by the mutually pumped phase conjugation grating in the photorefractive crystal (PR6), this mutually pumped phase conjugation light (26 ') produces transmitted light (31) by beam splitter (BS4), and by the generation of the mutually pumped phase conjugation grating in the photorefractive crystal (PR5) mutually pumped phase conjugation light (32), reflected light (20 ") that this mutually pumped phase conjugation light (32) produces through beam splitter (BS4) and flashlight (18) are through the transmitted light of beam splitter (BS4) generation (19 "), with equidirectional, mode with wavefront is injected on the detector (D), exports the optical heterodyne signal of stable flashlight.
8. according to claims 3 described methods of in the photorefractive adaptive optical heterodyne detection photorefractive effect application, setting up preset grating, it is characterized in that the photorefractive adaptive optical heterodyne detection system for when the pumping coexistence type system of pumping-mutually, the process of preset grating is as follows:
Laser instrument (F) is preset in setting, on the direction of flashlight (18), produce and preset light (14) through beam splitter (BS2) transmission, the incident parameter that light (14) is preset in adjustment is identical with the incident parameter of flashlight (18), make and preset the reflected light of light (14) by beam splitter (BS6) (21 ") are set up self pumped phase conjugation and the mutually pumped phase conjugation coexistence grating that presets light with the local reference light (15) that local laser instrument (H) produces in photorefractive crystal (PR7); and produce self pumped phase conjugation light (32) and mutually pumped phase conjugation light (22 "), this self pumped phase conjugation light (32) and mutually pumped phase conjugation light (22 ") produce transmitted light (16 ) and (17 ) by beam splitter (BS6) respectively; this transmitted light (16 ) and (17 ) are with equidirectional; the mode with wavefront is injected on the detector (D), produce the optical heterodyne output signal that presets light (14);
When needs adaptive optical heterodyne detection flashlight, close and preset laser instrument (F), introduce the flashlight (18) that produces and pass through (BS2) reflection by signal laser (G);
The reflected light that flashlight (18) produces by beam splitter (BS6) (25 ") are incided on the photorefractive crystal (PR7); on the basis of presetting pumping phase conjugation and mutually pumped phase conjugation coexistence grating certainly that keeps in photorefractive crystal (PR7); pass through photorefractive effect; set up the self pumped phase conjugation and the mutually pumped phase conjugation coexistence stationary raster of flashlight fast; and the self pumped phase conjugation light (33) and mutually pumped phase conjugation light (26 ") that produce flashlight respectively, the self pumped phase conjugation light (33) of this flashlight and mutually pumped phase conjugation light (26 "); produce transmitted light (19 ) and (20 ) respectively; this transmitted light (19 ) and (20 ) are with equidirectional; the form with wavefront is injected on the detector (D), the optical heterodyne output signal of generation flashlight (18) by beam splitter (BS6).
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