CN103234515A - Simulating method and device for dim light phase locking technology of spatial laser interference system - Google Patents
Simulating method and device for dim light phase locking technology of spatial laser interference system Download PDFInfo
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- CN103234515A CN103234515A CN201310137131XA CN201310137131A CN103234515A CN 103234515 A CN103234515 A CN 103234515A CN 201310137131X A CN201310137131X A CN 201310137131XA CN 201310137131 A CN201310137131 A CN 201310137131A CN 103234515 A CN103234515 A CN 103234515A
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Abstract
The invention provides a simulating method and device for a dim light phase locking technology of a spatial laser interference system. The method comprises the steps of: (a) generating alignment, monochrome, polarization state, strength and phase controllable polarized incident laser and polarized local laser; (b) modulating the phase of the incident laser by using a target signal simulation control system to simulate a target signal; (c) attenuating the strength of the incident laser through a differential interference system, and converging the incident laser and the local laser to form two paths of differential interference laser signals; and (d) modulating the phase of the local laser through a phase locking control system so that the phase of the local laser tracks and locks the phase of the incident laser. The simulating method and device can be used for precisely carrying out a ground simulation test by using an intersatellite laser interference ranging dim light phase locking technology.
Description
Technical field
The present invention relates to a kind of analogy method and device of space laser interference system low light level phaselock technique, particularly relate to a kind of analogy method and device that can be used for space double star laser heterodyne interference range measurement system low light level phaselock technique, in order to carry out the ground simulation experiment.
Background technology
Present China and a series of space exploration projects of the positive program launched in European and American areas, for example lunar gravimetry field explorer satellite of future generation plan, the advanced Gravity Satellite plan of the earth and space gravitational wave detection plan etc.The accurate measurement of space double star spacing is extremely important to the space exploration project.Because laser interference range finding can exceed three to four magnitudes than tellurometer survey on measuring accuracy, various countries are all planning to adopt in this intermediate item between star the laser interference ranging technology as the basic methodology of acquisition of signal on the basis of optimizing contrast.In addition, have relative velocity owing to measure between double star, laser generation Doppler frequency moves between star, so the laser interference range finding must be adopted heterodyne interferometry between star.But laser has very big dispersing through long Distance Transmission, and telescopical reception diameter is limited, and this has just caused the decay of received optical power.Received optical power Pr can be expressed as:
P: laser initial power; D: telescope diameter; λ: optical maser wavelength; L: interstellar distance.
For the advanced gravimetry of the earth, the double star spacing is about 100km, receives bore 1cm if adopt, laser power 100mW, and the luminous power behind the one-way attenuation that the far-end satellite receives is about the 10nW magnitude; For at the space gravitational wave detection, measuring the double star spacing is the gigameter magnitude, and telescope receives the about 40cm of bore, and laser power is 1W, and the luminous power behind the one-way attenuation that the far-end satellite receives is about the 100pW magnitude.
Laser is after the transmission of long distance, and power declines to a great extent, and as if the direct former spacecraft of reflected back without special processing, light signal can be very faint, can't guarantee effective acquisition of signal.Can utilize the phase-locked technology of optics will represent the low light level and local two laser of high light phase-locked (optical phaselocking) of long-range incident respectively at present, be about to the incident laser phase place and lock onto local laser (making local laser have the phase place identical with incident laser).Thus, local laser just has the information identical with incident laser, and just available local laser replaces incident laser to return former spacecraft.Effectively promoted signal intensity and signal to noise ratio (S/N ratio), made overlength distance, high-precision effective measurement become possibility.LISA or Grace-Follow-on etc. all adopt space double star laser low light level phaselock technique.
For reasonable method and technical support being provided for space exploration in the future, be necessary to design a kind of analogy method and device of space laser interference system low light level phaselock technique, particularly relate to a kind of analogy method and device that can be used for space double star laser heterodyne interference range measurement system low light level phaselock technique, in order to carry out the ground simulation experiment.
Summary of the invention
The technical matters that the present invention solves is exactly to provide a kind of analogy method of space laser interference system low light level phaselock technique, for the ground simulation experiment of accurately carrying out laser interference range finding between star.
Another technical matters that the present invention solves is exactly, and a kind of analogue means of space laser interference system low light level phaselock technique is provided, and can realize that the ground simulation of laser interference range finding between star is tested.
In order to address the above problem, the invention provides a kind of analogy method of space laser interference system low light level phaselock technique, comprise the steps:
(a) produce the local laser of the controlled polarization incident laser of collimation, monochrome, polarization state, intensity and phase place and polarization;
(b) by the echo signal analog control system, the phase place of described incident laser is modulated, be used for the simulated target signal;
(c) by the differential interferometry system, the intensity of incident laser is decayed and described incident laser and described local laser are converged formation two-way differential interferometry laser signal;
(d) by phase-locked control system, the phase place of described local laser is modulated, realize that the phase place of described local laser is to tracking and the locking of incident laser phase place.
Further, described step (a) specifically comprises the steps:
1) open the 1064nm laser instrument, preheated one-section is opened frequency regulator and acousto-optic frequency shifters power supply after the time, laser instrument output 90 degree linearly polarized lights;
2) through first half-reflecting half mirror, laser is divided into two-way, and light intensity reduces by half;
3) respectively through an acousto-optic frequency shifters, wedge, 90 degree polaroids, two-way laser produces required frequency difference 1MHz to two-way laser, and corrects the laser direction deflection that causes because of acousto-optic frequency shifters through wedged plate separately;
4) two-way laser enters electro-optic phase modulator separately respectively; Two-way laser passes through faraday isolator more separately, prevents laser return laser light device, influences the laser instrument operate as normal, and two ways of optical signals is respectively as incident laser and local laser;
Described step (b) specifically comprises the steps:
5) first computer control, first program-controlled voltage source is regulated and control first electro-optic phase modulator, and the double star spacing of coming the simulated target signal to cause changes i.e. phase deviation;
Described step (c) specifically comprises the steps:
6) incident laser through second corner cube mirror after, by attenuator decay light intensity, arrive second half-reflecting half mirror then;
7) local laser through the 3rd corner cube mirror after, arrive second half-reflecting half mirror;
8) through forming the differential interferometry laser signal behind second half-reflecting half mirror;
9) photodetector is converted into electric signal with the difference light signal;
10) the high accuracy number phasometer is accurately surveyed the phase error of two-way interference signal;
Described step (d) specifically comprises the steps:
11) second computing machine utilizes this phase error signal, by Adaptive PID Control method FEEDBACK CONTROL second program-controlled voltage source of optimizing, carry out the automatically controlled phase modulation of second electro-optic phase modulator, make the phase place of local laser follow the tracks of and lock the phase place of incident laser.
Further, described step (a) specifically comprises the steps::
1) open the 1064nm laser instrument, preheated one-section is opened frequency regulator and acousto-optic frequency shifters power supply after the time.Laser instrument output 45 degree linearly polarized lights;
2) laser prevents laser return laser light device through first faraday isolator, influences the laser instrument operate as normal, and through first half-reflecting half mirror, laser is divided into two-way, and light intensity reduces by half, and two ways of optical signals is respectively as incident laser and local laser;
3) two-way laser is separately respectively through an acousto-optic frequency shifters, wedge, corner cube mirror, and 90 spend polaroids, and two-way laser produces frequency difference 1MHz, and corrects the laser direction deflection that causes because of acousto-optic frequency shifters through wedged plate; Two-way laser enters electro-optic phase modulator separately respectively;
Described step (b) specifically comprises the steps:
4) first computer control, first program-controlled voltage source is regulated and control first electro-optic phase modulator, and the double star spacing of coming the simulated target signal to cause changes i.e. phase deviation;
Described step (c) specifically comprises the steps:
5) incident laser by attenuator decay light intensity, arrives second half-reflecting half mirror then;
6) local laser arrives second half-reflecting half mirror;
7) through forming the differential interferometry laser signal behind second half-reflecting half mirror;
8) photodetector is converted into electric signal with the difference light signal;
9) the high accuracy number phasometer is accurately surveyed the phase error of two-way interference signal;
Described step (d) specifically comprises the steps:
10) second computing machine utilizes this phase error signal, by Adaptive PID Control method FEEDBACK CONTROL second program-controlled voltage source of optimizing, carry out the automatically controlled phase modulation of second electro-optic phase modulator, make the phase place of local laser follow the tracks of and lock the phase place of incident laser.
A kind of analogue means of space laser interference system low light level phaselock technique comprises at least:
One incident laser arm is for generation of the controlled polarization incident laser of collimation, monochrome, polarization state, intensity and phase place;
One echo signal analog control system links to each other with described incident laser arm, is used for the phase place of described incident laser is modulated;
One local laser arm is for generation of the local laser of the controlled polarization of collimation, monochrome, polarization state, intensity and phase place;
One differential interferometry system, link to each other with described incident laser arm and described local laser arm, incident laser and described local laser after being used for intensity to described incident laser and decaying and will decay converge formation two-way differential interferometry laser signal, and the phase error of two-way differential interferometry laser signal is accurately surveyed;
One phase-locked control system is carried out analyzing and processing to the phase error that detects, and the phase place of described local laser is modulated, and makes the phase place of described local laser to incident laser Phase Tracking and locking.
Further, described incident laser arm comprises and setting gradually along optical axis direction:
A 1064nm laser instrument is 1064nm90 degree linearly polarized laser for generation of wavelength;
First half-reflecting half mirror is divided into two-way after making laser incident, and light intensity reduces by half;
First acousto-optic frequency shifters makes by the laser of described half-reflecting half mirror transmission warp shift frequency later;
First wedged plate makes by the deflection of the laser direction that causes behind the described first acousto-optic frequency shifters shift frequency to obtain correcting;
One the 1 degree polaroid, calibration of laser polarization state, the 90 degree linearly polarized lasers that shoot laser is maintained the standard;
First electro-optic phase modulator is used for the laser of process is carried out phase modulation under the control of described echo signal analog control system;
First faraday isolator is used for the laser of process is adjusted, and prevents laser return laser light device, influences the laser instrument operate as normal;
First fiber coupler is used for laser is delivered to second fiber coupler by optical fiber;
Described echo signal analog control system comprises:
First computing machine, the True Data that is used for input, storage space echo signal, be converted to the double star spacing data again, be converted to the incident laser phase data again, analyze data again, extract feature, set up model, be converted to the echo signal simulation softward, phase control signal is converted to the target voltage modulation signal;
First program-controlled voltage source is used for receiving the target voltage modulation signal that described computing machine sends, and described first electro-optic phase modulator is modulated;
Described local laser arm comprises and setting gradually along optical axis direction:
First corner cube mirror makes by the described first half-reflecting half mirror laser light reflected and reflects fully after miter angle incident, and propagates along optical axis direction;
A second sound optical frequency shifter makes by the described first corner cube mirror laser light reflected through shift frequency later, and produces required frequency difference with laser through first acousto-optic frequency shifters;
Second wedged plate makes by the deflection of the laser direction that causes behind the described second sound optical frequency shifter shift frequency to obtain correcting;
One the 2 90 degree polaroid, calibration of laser polarization state, the 90 degree linearly polarized lasers that shoot laser is maintained the standard;
Second electro-optic phase modulator is used for the laser of process is carried out phase modulation under the control of described phase-locked control system, makes phase place identical with incident laser;
Second faraday isolator is used for the laser of process is adjusted, and prevents laser return laser light device, influences the laser instrument operate as normal;
The 3rd fiber coupler is used for laser is delivered to the 4th fiber coupler by optical fiber;
Described differential interferometry system comprises and setting gradually along optical axis direction:
Second fiber coupler, described second fiber coupler links to each other with described first fiber coupler by optical fiber;
Second corner cube mirror, make from the described second fiber coupler emitting laser along miter angle incident after fully the reflection;
An attenuator makes through the described second corner cube mirror laser light reflected light intensity and obtains decay;
The 4th fiber coupler, described the 4th fiber coupler links to each other with described the 3rd fiber coupler by optical fiber;
The 3rd corner cube mirror, make from described the 4th fiber coupler emitting laser along miter angle incident after fully the reflection;
Second half-reflecting half mirror makes through the laser after described the 3rd corner cube mirror reflection of the laser behind the described attenuator and process and forms two-way differential interferometry laser signal from two surfaces after 45 degree incidents;
A photodetector makes described two-way differential interferometry laser signal be converted into electric signal;
A high accuracy number phasometer is accurately surveyed for the phase error of the described two-way differential interferometry laser signal that the described electric signal that imports into from described photodetector is comprised;
Described phase-locked control system comprises:
Second computing machine for the real-time phase data of gathering, the described high accuracy number phasometer of storage institute error of measurement divides the interference laser signal, by pid control algorithm generation phase control signal, is converted to local voltage modulation signal again;
Second program-controlled voltage source, be used for receiving the described local voltage modulation signal that described computing machine sends, described second electro-optic phase modulator is modulated, make the phase place of local laser follow the tracks of and lock the phase place of incident laser, realization namely realizes the phase-locked of two paths of signals to Phase Tracking locking in the incident laser.
Further, described incident laser arm comprises and setting gradually along optical axis direction:
A 1064nm laser instrument is 1064nm45 degree linearly polarized laser for generation of wavelength;
First faraday isolator, incident polarization direction are 45 degree, and the outgoing polarization direction is 90 degree, calibration of laser polarization state, the 90 degree linearly polarized lasers that shoot laser is maintained the standard;
First half-reflecting half mirror is divided into two-way after making laser incident, and light intensity reduces by half, and two ways of optical signals is respectively as incident laser and local laser;
First acousto-optic frequency shifters makes by described half-reflecting half mirror laser light reflected warp shift frequency later;
First wedged plate makes by the deflection of the laser direction that causes behind the described first acousto-optic frequency shifters shift frequency to obtain correcting;
First corner cube mirror makes the laser through described first wedged plate be reflected by 90 degree;
One the 1 degree polaroid calibration of laser polarization state, the 90 degree linearly polarized lasers that shoot laser is maintained the standard;
First electro-optic phase modulator is used for the laser of process is carried out phase modulation under the control of described echo signal analog control system;
Described echo signal analog control system comprises:
First computing machine, the True Data that is used for input, storage space echo signal, be converted to the double star spacing data again, be converted to the incident laser phase data again, analyze data again, extract feature, set up model, be converted to the echo signal simulation softward, phase control signal is converted to the target voltage modulation signal;
First program-controlled voltage source is used for receiving the target voltage modulation signal that described computing machine sends, and described first electro-optic phase modulator is modulated;
Described local laser arm comprises and setting gradually along optical axis direction:
A second sound optical frequency shifter makes by the laser of the described first half-reflecting half mirror transmission through shift frequency later, and produces required frequency difference with laser through first acousto-optic frequency shifters;
Second wedged plate makes by the deflection of the laser direction that causes behind the described second sound optical frequency shifter shift frequency to obtain correcting;
Second corner cube mirror makes the laser through described second wedged plate be reflected by 90 degree;
One the 2 90 degree polaroid, calibration of laser polarization state, the 90 degree linearly polarized lasers that shoot laser is maintained the standard;
Second electro-optic phase modulator is used for the laser of process is carried out phase modulation under the control of described phase-locked control system, makes phase place identical with incident laser;
Described differential interferometry system comprises and setting gradually along optical axis direction:
An attenuator makes the laser intensity through described first electro-optic phase modulator obtain decay;
Second half-reflecting half mirror makes the laser through the laser behind the described attenuator and described second electro-optic phase modulator of process form two-way differential interferometry laser signal from two surfaces after 45 degree incidents;
A photodetector makes described two-way differential interferometry laser signal be converted into electric signal;
A high accuracy number phasometer is accurately surveyed for the phase error of the described two-way differential interferometry laser signal that the described electric signal that imports into from described photodetector is comprised;
Described phase-locked control system comprises:
Second computing machine for the real-time phase data of gathering, the described high accuracy number phasometer of storage institute error of measurement divides the interference laser signal, by pid control algorithm generation phase control signal, is converted to local voltage modulation signal again;
Second program-controlled voltage source, be used for receiving the described local voltage modulation signal that described computing machine sends, described second electro-optic phase modulator is modulated, make the phase place of local laser follow the tracks of and lock the phase place of incident laser, realization namely realizes the phase-locked of two paths of signals to Phase Tracking locking in the incident laser.
Advantage of the present invention is:
1) purpose of the phase-locked control of space such as LISA or Grace-Follow-on double star laser is not the phase place that locks two-laser, but the incident laser phase information that will comprise echo signal locks onto local laser.The laser instrument of LISA or Grace-Follow-on has proposed high requirement: 10Hz/@1mHz.In the ground experiment stage, be difficult to obtain the laser instrument of precision like this, and the essence of laser phaselock technique is that echo signals such as gravitational wave or gravity distortion are locked, so when carrying out laser phaselock technique ground simulation experiment, adopt single laser instrument two acousto-optic frequency shifters (AOM) to carry out frequency modulation and produce two-way laser, be used for simulating the two-way laser instrument, can reduce the requirement to laser instrument so greatly, and overcome laser instrument and be lower than the phase noise influence of 0.1Hz frequency range.
2) by the control of the control software programming among PC program-controlled voltage source, and then realize that electro-optic phase modulator (EOM) is to the high precision modulation of laser phase, can be used for the variation of virtual space laser satellite interfeerometry ranging culminant star spacing, and can introduce corresponding noise signal according to actual conditions, the star spacing under the real simulated space environment changes more.Simultaneously can accurately regulate electro-optic phase modulator (EOM) by phase-locked control loop again, realize that the high precision of incident laser and local laser is phase-locked.
3) complicacy of external environment condition has brought very big difficulty for the phase-locked control of laser.This is tested phase-locked controller and adopts the Adaptive PID Control of optimizing, and throttle signal frequency range noise is controlled EOM fast and realized Phase Tracking and locking.
Description of drawings
Fig. 1 is the analogue means figure of a kind of space laser interference system low light level phaselock technique of the present invention.
Fig. 2 is echo signal simulation system process flow diagram of the present invention.
Fig. 3 is phase-locked control system process flow diagram of the present invention.
Fig. 4 is the analogue means figure of another kind of space laser interference system low light level phaselock technique of the present invention.
Drawing indicates:
First corner cube mirror, 31 second corner cube mirrors, 32 first acousto-optic frequency shifters 41
Second sound optical frequency shifter 42 first wedged plates 51 second wedged plates 52
The one 90 degree polaroid 61 the 2 90 degree polaroid 62 first program-controlled voltage sources 181
First electro-optic phase modulator, 8 second electro-optic phase modulators, 9 first faraday isolators 101
Second faraday isolator, 102 first fiber couplers, 111 second fiber couplers 112
The 3rd fiber coupler 121 the 4th fiber coupler 122 photodetectors 14
High accuracy number phasometer 15 second program-controlled voltage sources 182 first computing machines 191
Embodiment
Hereinafter will be elaborated to embodiments of the invention by reference to the accompanying drawings.Need to prove that under the situation of not conflicting, the embodiment among the application and the feature among the embodiment be combination in any mutually.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
The invention provides the analogue means of a kind of space laser interference system low light level phaselock technique as shown in Figure 1.
Comprise an incident laser arm, for generation of the controlled polarization incident laser of collimation, monochrome, polarization state, intensity and phase place.
Further, the incident laser arm comprises and setting gradually along optical axis direction:
A 1064nm laser instrument 1 is 1064nm90 degree linearly polarized laser for generation of wavelength; First half-reflecting half mirror 21 is divided into two-way after making laser incident, and light intensity reduces by half; First acousto-optic frequency shifters 41 makes by the laser of half-reflecting half mirror 21 transmissions warp shift frequency later; First wedged plate 51 makes by the deflection of the laser direction that causes behind first acousto-optic frequency shifters, 41 shift frequencies to obtain correcting; One the 1 degree polaroid 61, calibration of laser polarization state, the 90 degree linearly polarized lasers that shoot laser is maintained the standard; First electro-optic phase modulator 8 is used for the laser of process is carried out phase modulation under the control of echo signal analog control system; First faraday isolator 101 is used for the laser of process is adjusted, and prevents laser return laser light device, influences the laser instrument operate as normal; First fiber coupler 111 is used for laser is delivered to second fiber coupler 112 by optical fiber.
Also comprise an echo signal analog control system, link to each other with the incident laser arm, be used for the phase place of incident laser is modulated.
Further, the echo signal analog control system comprises:
First computing machine 191, the True Data that is used for input, storage space echo signal, be converted to the double star spacing data again, be converted to the incident laser phase data again, analyze data again, extract feature, set up model, be converted to the echo signal simulation softward, phase control signal is converted to the target voltage modulation signal; First program-controlled voltage source 181 is used for receiving the target voltage modulation signal that first computing machine 191 sends, and first electro-optic phase modulator 8 is modulated.Echo signal analog control system flow process is referring to Fig. 2.
Also comprise a local laser arm, for generation of the local laser of the controlled polarization of collimation, monochrome, polarization state, intensity and phase place.
Further, local laser arm comprises and setting gradually along optical axis direction:
First corner cube mirror 31 makes by first half-reflecting half mirror, 21 laser light reflected and reflects fully after miter angle incident, and propagates along optical axis direction; A second sound optical frequency shifter 42 makes by first corner cube mirror, 31 laser light reflected through shift frequency later, and produces required frequency difference with laser through first acousto-optic frequency shifters 41; Second wedged plate 52 makes by the deflection of the laser direction that causes behind second sound optical frequency shifter 42 shift frequencies to obtain correcting; One the 2 90 degree polaroid 62, calibration of laser polarization state, the 90 degree linearly polarized lasers that shoot laser is maintained the standard; Second electro-optic phase modulator 9 is used for the laser of process is carried out phase modulation under the control of phase-locked control system, makes phase place identical with incident laser; Second faraday isolator 102 is used for the laser of process is adjusted, and prevents laser return laser light device, influences the laser instrument operate as normal; The 3rd fiber coupler 121 is used for laser is delivered to the 4th fiber coupler 122 by optical fiber.
Also comprise a differential interferometry system, link to each other with incident laser arm and local laser arm, incident laser and local laser after being used for intensity to incident laser and decaying and will decay converge formation two-way differential interferometry laser signal, and the phase error of two-way differential interferometry laser signal is accurately surveyed.
Further, the differential interferometry system comprises and setting gradually along optical axis direction:
Second fiber coupler, 112, the second fiber couplers 112 link to each other with first fiber coupler 111 by optical fiber; Second corner cube mirror 32, make from second fiber coupler, 112 emitting lasers along miter angle incident after fully the reflection; An attenuator 13 makes through second corner cube mirror, 32 laser light reflected light intensity and obtains decay; The 4th fiber coupler 122, the four fiber couplers 122 link to each other with the 3rd fiber coupler 121 by optical fiber; The 3rd corner cube mirror 33, make from the 4th fiber coupler 122 emitting lasers along miter angle incident after fully the reflection; Second half-reflecting half mirror 22 makes through the laser behind the attenuator 13 and through the laser after 33 reflections of the 3rd corner cube mirror and forms two-way differential interferometry laser signal from two surfaces after 45 degree incidents; A photodetector 14 makes two-way differential interferometry laser signal be converted into electric signal; A high accuracy number phasometer 15 is accurately surveyed for the phase error of the two-way differential interferometry laser signal that the electric signal that imports into from photodetector 14 is comprised.
Also comprise a phase-locked control system, the phase error that detects is carried out analyzing and processing, and the phase place of local laser is modulated, make local laser phase follow the tracks of and lock the incident laser phase place.
Further, phase-locked control system comprises:
The concrete operations step is:
1) open 1064nm laser instrument 1, preheated one-section is opened frequency regulator and first acousto-optic frequency shifters 41 and second sound optical frequency shifter 42 power supplys after the time.Laser instrument 1 output 90 degree linearly polarized lasers;
2) through first half-reflecting half mirror 21, laser is divided into two-way, and light intensity reduces by half;
3) two-way laser is separately respectively through an acousto-optic frequency shifters, wedge, 90 degree polaroids, two-way laser produces the relation of the design of frequency difference 1MHz(difference frequency and Doppler shift: there is Doppler shift in the space double star, be accurate reflected measurement signal, need the laser difference frequency greater than the Doppler shift frequency difference, numerical value be come according to different goals in research fixed, be 1MHz as the gravimetric frequency difference of advanced person, the frequency difference of gravitational wave detection is 20MHz), and the laser direction deflection that correction causes because of acousto-optic frequency shifters through wedged plate;
4) two-way laser enters electro-optic phase modulator separately respectively, and two-way laser passes through faraday isolator more separately, prevents laser return laser light device, influences the laser instrument operate as normal, and the two-way laser signal is respectively as incident laser and local laser;
5) 181 pairs of first electro-optic phase modulators 8 of first computing machine, 191 control first program-controlled voltage sources are regulated and control, and the star spacing of coming the simulated target signal to cause changes i.e. phase deviation;
6) incident laser through second corner cube mirror 32 after, by attenuator 13 decay light intensity, arrive half-reflecting half mirror 22 then;
7) local laser through the 3rd corner cube mirror 33 after, arrive second half-reflecting half mirror 22;
8) form the differential interferometry laser signal through second half-reflecting half mirror, 22 backs;
9) photodetector 14 is converted into electric signal with the difference light signal;
10) high accuracy number phasometer 15 is accurately surveyed the phase error of two-way interference signal;
11) first computing machine 192 utilizes this phase error signal, by Adaptive PID Control method FEEDBACK CONTROL second program-controlled voltage source of optimizing 182, carry out the automatically controlled phase modulation of second electro-optic phase modulator 9, make the phase place of local laser follow the tracks of and lock the phase place of incident laser.
The analogue means of a kind of space laser interference system low light level phaselock technique that present embodiment provides adopts the secondary vibrating isolation system, and it is made up of independent ground and consecutive victories vibration-isolating platform, and isolation frequency is greater than 1Hz.By the secondary vibrating isolation system effectively isolator surface vibration and other dither to the influence of experiment porch.
Adopt high vacuum system and invar platform.High vacuum system can reach 10 by mechanical pump, molecular pump and three grades of cooperations of ionic pump
-5The vacuum tightness of Pa.It can reduce influence and the virtual space vacuum environment of atmospheric disturbance.The expansion coefficient of invar is 10
-8/ ℃.By vacuum system and invar optical table, can effectively suppress thermonoise to the influence of the phase-locked control system of laser.
Adopt electromagnetic shielding system.The interference of external electromagnetic radiation is one of overriding noise source of photodetector.For this noise like, we adopt electromagnetic shielding system.Electromagnetic shielding system is to be that 30mm steel cavity constitutes by thickness.It can effectively shield extraneous electromagnetic interference (EMI) to the influence of photodetector.
Embodiment two
In order to reduce optical fiber to the influence of experimental result, the present invention provides the analogue means of preferred a kind of space laser interference system low light level phaselock technique again, referring to Fig. 4.Omit with embodiment one same section.
Comprise an incident laser arm, for generation of the controlled polarization incident laser of collimation, monochrome, polarization state, intensity and phase place.
Further, the incident laser arm comprises and setting gradually along optical axis direction:
A 1064nm laser instrument 1 is 1064nm45 degree linearly polarized laser for generation of wavelength; First faraday isolator 101, incident polarization direction are 45 degree, and the outgoing polarization direction is 90 degree, and the polarization required with EOM is identical, is used for the laser of process is adjusted, and prevents laser return laser light device, influences the laser instrument operate as normal; First half-reflecting half mirror 21 is divided into two-way after making laser incident, and light intensity reduces by half, and two ways of optical signals is respectively as incident laser and local laser; First acousto-optic frequency shifters 41 makes by half-reflecting half mirror 21 laser light reflected warp shift frequency later; First wedged plate 51 makes by the deflection of the laser direction that causes behind first acousto-optic frequency shifters, 41 shift frequencies to obtain correcting; First corner cube mirror 31 makes the laser through first wedged plate 51 be reflected by 90 degree; One the 1 degree polaroid 61, calibration of laser polarization state, the 90 degree linearly polarized lasers that shoot laser is maintained the standard; First electro-optic phase modulator 8 is used for the laser of process is carried out phase modulation under the control of echo signal analog control system.
Also comprise an echo signal analog control system, link to each other with the incident laser arm, be used for the phase place of incident laser is modulated.
Further, the echo signal analog control system comprises:
First computing machine 191, the True Data that is used for input, storage space echo signal, be converted to the double star spacing data again, be converted to the incident laser phase data again, analyze data again, extract feature, set up model, be converted to the echo signal simulation softward, phase control signal is converted to the target voltage modulation signal.
First program-controlled voltage source 181 is used for the target voltage modulation signal that receiving computer sends, and first electro-optic phase modulator 8 is modulated.
Also comprise a local laser arm, for generation of the local laser of the controlled polarization of collimation, monochrome, polarization state, intensity and phase place.
Further, local laser arm comprises and setting gradually along optical axis direction:
A second sound optical frequency shifter 42 makes by the laser of first half-reflecting half mirror, 21 transmissions through shift frequency later, and produces required frequency difference with laser through first acousto-optic frequency shifters 41; Second wedged plate 52 makes by the deflection of the laser direction that causes behind second sound optical frequency shifter 42 shift frequencies to obtain correcting; Second corner cube mirror 32 makes the laser through second wedged plate 52 be reflected by 90 degree; One the 2 90 degree polaroid 62 calibration of laser polarization states, the 90 degree linearly polarized lasers that shoot laser is maintained the standard; Second electro-optic phase modulator 9 is used for the laser of process is carried out phase modulation under the control of phase-locked control system, makes phase place identical with incident laser.
Also comprise a differential interferometry system, link to each other with incident laser arm and local laser arm, incident laser and local laser after being used for intensity to incident laser and decaying and will decay converge formation two-way differential interferometry laser signal, and the phase error of two-way differential interferometry laser signal is accurately surveyed.
Further, the differential interferometry system comprises and setting gradually along optical axis direction:
An attenuator 13 makes the laser intensity through first electro-optic phase modulator 8 obtain decay; Second half-reflecting half mirror 22, make through the laser behind the attenuator 13 with after 45 degree incidents, form two-way differential interferometry laser signal from two surfaces through the laser of second electro-optic phase modulator 9; A photodetector 14 makes two-way differential interferometry laser signal be converted into electric signal; A high accuracy number phasometer 15 is accurately surveyed for the phase error of the two-way differential interferometry laser signal that the electric signal that imports into from photodetector 14 is comprised.
Also comprise a phase-locked control system, the phase error that detects is carried out analyzing and processing, and the phase place of local laser is modulated, make the phase place of local laser follow the tracks of and lock the incident laser phase place.
Further, phase-locked control system comprises:
The concrete operations step is:
1) open 1064nm laser instrument 1, preheated one-section is opened frequency regulator and acousto-optic frequency shifters power supply after the time.Laser instrument output 45 degree linearly polarized lights;
2) laser prevents laser return laser light device through first faraday isolator 101, influences the laser instrument operate as normal, and through first half-reflecting half mirror 21, laser is divided into two-way, and light intensity reduces by half, and two ways of optical signals is respectively as incident laser and local laser;
3) two-way laser is separately respectively through an acousto-optic frequency shifters, wedge, corner cube mirror, and 90 spend polaroids, and two-way laser produces frequency difference 1MHz, and corrects the laser direction deflection that causes because of acousto-optic frequency shifters through wedged plate; Two-way laser enters electro-optic phase modulator separately respectively;
4) 181 pairs of first electro-optic phase modulators 8 of first computing machine, 191 control first program-controlled voltage sources are regulated and control, and the double star spacing of coming the simulated target signal to cause changes i.e. phase deviation;
5) incident laser by attenuator 13 decay light intensity, arrives second half-reflecting half mirror 22 then;
6) local laser arrives second half-reflecting half mirror 22;
7) form the differential interferometry laser signal through second half-reflecting half mirror, 22 backs;
8) photodetector 14 is converted into electric signal with the difference light signal;
9) high accuracy number phasometer 15 is accurately surveyed the phase error of two-way interference signal;
10) second computing machine 192 utilizes this phase error signal, by Adaptive PID Control method FEEDBACK CONTROL second program-controlled voltage source of optimizing 182, carry out the automatically controlled phase modulation of second electro-optic phase modulator, make the phase place of local laser follow the tracks of and lock the phase place of incident laser.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the analogy method of a space laser interference system low light level phaselock technique is characterized in that, comprises the steps:
(a) produce the local laser of the controlled polarization incident laser of collimation, monochrome, polarization state, intensity and phase place and polarization;
(b) by the echo signal analog control system, the phase place of described incident laser is modulated, be used for the simulated target signal;
(c) by the differential interferometry system, the intensity of incident laser is decayed and described incident laser and described local laser are converged formation two-way differential interferometry laser signal;
(d) by phase-locked control system, the phase place of described local laser is modulated, make the phase place of described local laser follow the tracks of and lock the phase place of incident laser.
2. weigh the analogy method of 1 described a kind of space laser interference system low light level phaselock technique as claim, it is characterized in that described step (a) specifically comprises the steps:
1) open 1064nm laser instrument (1), preheated one-section is opened frequency regulator and acousto-optic frequency shifters power supply after the time.Laser instrument output 45 degree linearly polarized lights;
2) laser prevents laser return laser light device through first faraday isolator (101), influences the laser instrument operate as normal, and through first half-reflecting half mirror (21), laser is divided into two-way, and light intensity reduces by half, and two ways of optical signals is respectively as incident laser and local laser;
3) two-way laser is separately respectively through an acousto-optic frequency shifters, wedge, corner cube mirror, and 90 spend polaroids, and two-way laser produces frequency difference 1MHz, and corrects the laser direction deflection that causes because of acousto-optic frequency shifters through wedged plate; Two-way laser enters electro-optic phase modulator separately respectively;
Described step (b) specifically comprises the steps:
4) first computing machine (191) control first program-controlled voltage source (181) is regulated and control first electro-optic phase modulator (8), and the double star spacing of coming the simulated target signal to cause changes i.e. phase deviation;
Described step (c) specifically comprises the steps:
5) incident laser by attenuator (13) decay light intensity, arrives second half-reflecting half mirror (22) then;
6) local laser arrives second half-reflecting half mirror (22);
7) form the differential interferometry laser signal through second half-reflecting half mirror (22) back;
8) photodetector (14) is converted into electric signal with the difference light signal;
9) high accuracy number phasometer (15) is accurately surveyed the phase error of two-way interference signal;
Described step (d) specifically comprises the steps:
10) second computing machine (192) utilizes this phase error signal, by Adaptive PID Control method FEEDBACK CONTROL second program-controlled voltage source of optimizing (182), carry out the automatically controlled phase modulation of second electro-optic phase modulator, make the phase place of local laser follow the tracks of and lock the phase place of incident laser.
3. weigh the analogy method of 1 described a kind of space laser interference system low light level phaselock technique as claim, it is characterized in that described step (a) specifically comprises the steps:
1) open the 1064nm laser instrument, preheated one-section is opened frequency regulator and acousto-optic frequency shifters power supply after the time, laser instrument output 90 degree linearly polarized lights;
2) through first half-reflecting half mirror (21), laser is divided into two-way, and light intensity reduces by half;
3) respectively through an acousto-optic frequency shifters, wedge, 90 degree polaroids, two-way laser produces required frequency difference 1MHz to two-way laser, and corrects the laser direction deflection that causes because of acousto-optic frequency shifters through wedged plate separately;
4) two-way laser enters electro-optic phase modulator separately respectively; Two-way laser passes through faraday isolator more separately, prevents laser return laser light device, influences the laser instrument operate as normal, and two ways of optical signals is respectively as incident laser and local laser;
Described step (b) specifically comprises the steps:
5) first computing machine (191) control first program-controlled voltage source (181) is regulated and control first electro-optic phase modulator (8), and the double star spacing of coming the simulated target signal to cause changes i.e. phase deviation;
Described step (c) specifically comprises the steps:
6) incident laser through second corner cube mirror (32) after, by attenuator (13) decay light intensity, arrive second half-reflecting half mirror (22) then;
7) local laser through the 3rd corner cube mirror (33) after, arrive second half-reflecting half mirror (22);
8) form the differential interferometry laser signal through second half-reflecting half mirror (22) back;
9) photodetector (14) is converted into electric signal with the difference light signal;
10) high accuracy number phasometer (15) is accurately surveyed the phase error of two-way interference signal;
Described step (d) specifically comprises the steps:
11) second computing machine (192) utilizes this phase error signal, by Adaptive PID Control method FEEDBACK CONTROL second program-controlled voltage source of optimizing (182), carry out the automatically controlled phase modulation of second electro-optic phase modulator (9), make the phase place of local laser follow the tracks of and lock the phase place of incident laser.
4. the analogue means of a space laser interference system low light level phaselock technique is characterized in that, comprises at least:
One incident laser arm is for generation of the controlled polarization incident laser of collimation, monochrome, polarization state, intensity and phase place;
One echo signal analog control system links to each other with described incident laser arm, is used for the phase place of described incident laser is modulated;
One local laser arm is for generation of the local laser of the controlled polarization of collimation, monochrome, polarization state, intensity and phase place;
One differential interferometry system, link to each other with described incident laser arm and described local laser arm, incident laser and described local laser after being used for intensity to described incident laser and decaying and will decay converge formation two-way differential interferometry laser signal, and the phase error of two-way differential interferometry laser signal is accurately surveyed;
One phase-locked control system is carried out analyzing and processing to the phase error that detects, and the phase place of described local laser is modulated, and makes the phase place of described local laser follow the tracks of and lock the phase place of incident laser.
5. the analogue means of a kind of space laser interference system low light level phaselock technique as claimed in claim 4 is characterized in that:
Described incident laser arm comprises and setting gradually along optical axis direction:
A 1064nm laser instrument (1) is 1064nm45 degree linearly polarized laser for generation of wavelength;
First faraday isolator (101), incident polarization direction are 45 degree, and the outgoing polarization direction is 90 degree, are used for the laser of process is adjusted, and prevent laser return laser light device, influence the laser instrument operate as normal;
First half-reflecting half mirror (21) is divided into two-way after making laser incident, and light intensity reduces by half, and two ways of optical signals is respectively as incident laser and local laser;
First acousto-optic frequency shifters (41) makes by described half-reflecting half mirror (21) laser light reflected warp shift frequency later;
First wedged plate (51) makes by the deflection of the laser direction that causes behind described first acousto-optic frequency shifters (41) shift frequency to obtain correcting;
First corner cube mirror (31) makes the laser through described first wedged plate (51) be reflected by 90 degree;
One the 1 degree polaroid (61), calibration of laser polarization state, the 90 degree linearly polarized lasers that shoot laser is maintained the standard;
First electro-optic phase modulator (8) is used for the laser of process is carried out phase modulation under the control of described echo signal analog control system;
Described echo signal analog control system comprises:
First computing machine (191), the True Data that is used for input, storage space echo signal, be converted to the double star spacing data again, be converted to the incident laser phase data again, analyze data again, extract feature, set up model, be converted to the echo signal simulation softward, phase control signal is converted to the target voltage modulation signal;
First program-controlled voltage source (181) is used for receiving the target voltage modulation signal that described computing machine sends, and described first electro-optic phase modulator (8) is modulated;
Described local laser arm comprises and setting gradually along optical axis direction:
A second sound optical frequency shifter (42) makes by the laser of described first half-reflecting half mirror (21) transmission through shift frequency later, and produces required frequency difference with laser through first acousto-optic frequency shifters (41);
Second wedged plate (52) makes by the deflection of the laser direction that causes behind described second sound optical frequency shifter (42) shift frequency to obtain correcting;
Second corner cube mirror (32) makes the laser through described second wedged plate (52) be reflected by 90 degree;
One the 2 90 degree polaroid (62), calibration of laser polarization state, the 90 degree linearly polarized lasers that shoot laser is maintained the standard;
Second electro-optic phase modulator (9) is used for the laser of process is carried out phase modulation under the control of described phase-locked control system, makes phase place identical with incident laser;
Described differential interferometry system comprises and setting gradually along optical axis direction:
An attenuator (13) makes through described laser intensity through the first photoelectricity phase-modulator (8) and obtains decay;
Second half-reflecting half mirror (22) makes through the laser behind the described attenuator (13) and through described second laser through electro-optic phase modulator (9) and forms two-way differential interferometry laser signal from two surfaces after 45 degree incidents;
A photodetector (14) makes described two-way differential interferometry laser signal be converted into electric signal;
A high accuracy number phasometer (15) is accurately surveyed for the phase error of the described two-way differential interferometry laser signal that the described electric signal that imports into from described photodetector (14) is comprised;
Described phase-locked control system comprises:
Second computing machine (192) is used for gathering, stores described high accuracy number phasometer (15) institute error of measurement and divides the real-time phase data of interfering laser signal, generates phase control signal by pid control algorithm, is converted to local voltage modulation signal again;
Second program-controlled voltage source (182), be used for receiving the described local voltage modulation signal that described computing machine sends, described second electro-optic phase modulator (9) is modulated, make the phase place of local laser follow the tracks of and lock the phase place of incident laser, realization namely realizes the phase-locked of two paths of signals to Phase Tracking locking in the incident laser.
6. the analogue means of a kind of space laser interference system low light level phaselock technique as claimed in claim 4 is characterized in that:
Described incident laser arm comprises and setting gradually along optical axis direction:
A 1064nm laser instrument (1) is 1064nm45 degree linearly polarized laser for generation of wavelength;
First half-reflecting half mirror (21) is divided into two-way after making laser incident, and light intensity reduces by half;
First acousto-optic frequency shifters (41) makes by the laser of described half-reflecting half mirror (21) transmission warp shift frequency later;
First wedged plate (51) makes by the deflection of the laser direction that causes behind described first acousto-optic frequency shifters (41) shift frequency to obtain correcting;
One the 1 degree polaroid (61), calibration of laser polarization state, the 90 degree linearly polarized lasers that shoot laser is maintained the standard;
First electro-optic phase modulator (8) is used for the laser of process is carried out phase modulation under the control of described echo signal analog control system;
First faraday isolator (101) is used for the laser of process is adjusted, and prevents laser return laser light device, influences the laser instrument operate as normal;
First fiber coupler (111) is used for laser is delivered to second fiber coupler (112) by optical fiber;
Described echo signal analog control system comprises:
First computing machine (191), the True Data that is used for input, storage space echo signal, be converted to the double star spacing data again, be converted to the incident laser phase data again, analyze data again, extract feature, set up model, be converted to the echo signal simulation softward, phase control signal is converted to the target voltage modulation signal;
First program-controlled voltage source (181) is used for receiving the target voltage modulation signal that described computing machine sends, and described first electro-optic phase modulator (8) is modulated;
Described local laser arm comprises and setting gradually along optical axis direction:
First corner cube mirror (31) makes by described first half-reflecting half mirror (21) laser light reflected and reflects fully after miter angle incident, and propagates along optical axis direction;
A second sound optical frequency shifter (42) makes by described first corner cube mirror (31) laser light reflected through shift frequency later, and produces required frequency difference with laser through first acousto-optic frequency shifters (41);
Second wedged plate (52) makes by the deflection of the laser direction that causes behind described second sound optical frequency shifter (42) shift frequency to obtain correcting;
One the 2 90 degree polaroid (62), calibration of laser polarization state, the 90 degree linearly polarized lasers that shoot laser is maintained the standard;
Second electro-optic phase modulator (9) is used for the laser of process is carried out phase modulation under the control of described phase-locked control system, makes phase place identical with incident laser;
Second faraday isolator (102) is used for the laser of process is adjusted, and prevents laser return laser light device, influences the laser instrument operate as normal;
The 3rd fiber coupler (121) is used for laser is delivered to the 4th fiber coupler (122) by optical fiber;
Described differential interferometry system comprises and setting gradually along optical axis direction:
Second fiber coupler (112), described second fiber coupler (112) links to each other with described first fiber coupler (111) by optical fiber;
Second corner cube mirror (32), make from described second fiber coupler (112) emitting laser along miter angle incident after fully the reflection;
An attenuator (13) makes through described second corner cube mirror (32) laser light reflected light intensity and obtains decay;
The 4th fiber coupler (122), described the 4th fiber coupler (122) links to each other with described the 3rd fiber coupler (121) by optical fiber;
The 3rd corner cube mirror (33), make from described the 4th fiber coupler (122) emitting laser along miter angle incident after fully the reflection;
Second half-reflecting half mirror (22) makes through the laser behind the described attenuator (13) and through the laser after described the 3rd corner cube mirror (33) reflection and forms two-way differential interferometry laser signal from two surfaces after 45 degree incidents;
A photodetector (14) makes described two-way differential interferometry laser signal be converted into electric signal;
A high accuracy number phasometer (15) is accurately surveyed for the phase error of the described two-way differential interferometry laser signal that the described electric signal that imports into from described photodetector (14) is comprised;
Described phase-locked control system comprises:
Second computing machine (192) is used for gathering, stores described high accuracy number phasometer (15) institute error of measurement and divides the real-time phase data of interfering laser signal, generates phase control signal by pid control algorithm, is converted to local voltage modulation signal again;
Second program-controlled voltage source (182), be used for receiving the described local voltage modulation signal that described computing machine sends, described second electro-optic phase modulator (9) is modulated, make the phase place of local laser follow the tracks of and lock the phase place of incident laser, realization namely realizes the phase-locked of two paths of signals to Phase Tracking locking in the incident laser.
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