CN116093727B - Injection type laser phase locking control method and device for space gravitational wave detection - Google Patents
Injection type laser phase locking control method and device for space gravitational wave detection Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10084—Frequency control by seeding
- H01S3/10092—Coherent seed, e.g. injection locking
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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Abstract
The invention provides an injection type laser phase-locking control method and device for space gravitational wave detection, wherein the method comprises the following steps: emitting main laser, namely simulating the laser emitted by the main spacecraft root in the space gravitational wave detection, and dividing the laser into two beams after polarization state regulation; the method comprises the steps that through an injection locking system, the phase of slave laser is subjected to injection locking by using laser for injection locking, the slave laser is used for simulating laser emitted by a local spacecraft, and the laser after injection locking is divided into two beams; the input laser generates interference through the long-stability control system, the phase of the interference signal is locked, and the input laser is input into the injection locking system for controlling the frequency drift of the main laser and the slave laser within the injection locking range. The invention also provides a device applying the method, solves the shot noise bottleneck problem in the classical analog and digital phase-locking control method by an injection locking system, avoids the limitation of the shot noise of the detector on the phase-locking precision, and realizes full-band noise suppression.
Description
Technical Field
The invention belongs to the field of space gravitational wave detection, and particularly relates to an injection type laser phase-locking control method and device for space gravitational wave detection.
Background
After long-distance transmission, the power of the laser is greatly reduced, and if the laser is directly reflected back to the original spacecraft without special treatment, the optical signal is very weak, and effective signal detection cannot be ensured. Two lasers, representing remotely incident weak light and locally strong light, respectively, may be phase locked (optical phase-locked) using optical phase-locking techniques, i.e., the incident laser is phase locked to the local laser (such that the local laser has the same phase as the incident laser). And then the high-power local laser is used for replacing the incident laser to return to the original spacecraft. The signal strength and the signal to noise ratio can be effectively improved, and the ultra-long-distance and high-precision effective measurement is possible.
At present, most of the analog methods and devices of the weak light phase locking technology utilize classical analog and digital phase locking control methodologies, and although the method can accurately perform the ground analog experiment of the weak light phase locking technology of the inter-satellite laser interference ranging, the method also needs to overcome the maximum noise problem faced by the weak light phase locking control, namely the shot noise problem caused by a photoelectric detector, in order to achieve the detection precision of the space gravitational wave. Shot noise caused by weak light on the order of 100pW (magnitude of spatial gravitational wave detection light intensity) is:
wherein e is the electron quantity (1.6X10) -19 C) R is the detector responsivity (0.68A/W), η is the interference efficiency of the laser interferometer (≡80%), P rec Is the detected light intensity (100 pW). It can be seen that compared with the picowatt-level weak light phase-locking control precision required by the space gravitational wave detection: is better than 2 pi multiplied by 10 -6 rad/≡hz, the shot noise is not neglected.
Disclosure of Invention
The invention provides an injection type laser phase-locking control method and device for space gravitational wave detection, which are used for solving the shot noise bottleneck problem in classical analog and digital phase-locking control methodologies.
In a first aspect of the present invention, there is provided an injection laser phase lock control method for spatial gravitational wave detection, the method comprising the steps of:
s100, emitting main laser, namely simulating laser emitted by a main spacecraft in space gravitational wave detection, and dividing the laser into two beams after regulating and controlling polarization states, wherein one beam is input into an injection locking system for performing injection locking on the slave laser, and the other beam is input into a long stability control system for controlling the injection locking system;
s200, performing injection locking on the phase of slave laser by using laser used for injection locking through an injection locking system, wherein the slave laser is used for simulating laser emitted by a local spacecraft, the laser after injection locking is divided into two beams, one beam of laser after injection locking is used as output light after power amplification, and the other beam of laser after injection locking enters a long stability control system;
s300, two input lasers are interfered through a long-stability control system, the phase of interference signals is locked, and the signals are input into an injection locking system and used for controlling the frequency drift of the main laser and the slave laser to be in an injection locking range.
Further, the specific content of step S200 is as follows:
s201, inputting laser used for injection locking into an injection locking system, and locking the frequency phases of a master laser and a slave laser through an acousto-optic modulator;
s202, attenuating the light intensity of laser used for injection locking by utilizing an optical attenuation sheet, and detecting the light intensity of the laser emitted by the main spacecraft when reaching the auxiliary spacecraft by using the simulated space gravitational wave;
s203, the laser enters a circulator, the slave laser of the slave laser is subjected to injection locking according to the locked frequency phase difference, and the modulated slave laser is split into two beams by a second beam splitter after power amplification.
Further, the specific content of step S300 is as follows:
s301, two beams of laser input to a long stable control system interfere in an optical fiber coupler;
s302, converting the interference signal into an electric signal through a photoelectric detector;
s303, mixing with a standard signal generated by an ultra-stable clock;
s304, inputting the mixed signal into a phase-locked loop, and outputting a voltage modulation signal by the phase-locked loop;
s305, adjusting the acousto-optic modulator by adopting a voltage modulation signal, and locking the phase of the mixed interference signal, so that the frequency drift of the master laser and the slave laser is in an injection locking range, and the injection locking is ensured not to lose lock.
Further, the specific content of step S100 is as follows:
s101, a main laser emits main laser;
s102, after the main laser passes through the Faraday isolator, regulating the polarization state of the laser by using an optical fiber polarization controller so as to be consistent with the polarization state of the slave laser;
s103, the regulated main laser is divided into two beams through a first beam splitter.
Further, S101, a main laser emits a milliwatt level main laser, and the main laser is used for simulating laser emitted by a main spacecraft in space gravitational wave detection;
s102, after the main laser passes through the Faraday isolator, regulating the polarization state of the laser by using an optical fiber polarization controller so as to be consistent with the polarization state of the slave laser; wherein the slave laser is used for simulating the laser emitted by the local spacecraft;
s103, dividing the regulated main laser into two beams through a first beam splitter, wherein one beam is input into an injection locking system for injection locking, and the other beam is input into a long stability control system for long stability control;
s201, inputting laser used for injection locking into an injection locking system, and locking the frequency phases of a master laser and a slave laser through an acousto-optic modulator;
s202, utilizing an optical attenuation sheet to attenuate the light intensity of laser used for injection locking into the 100 pW-level laser intensity, and detecting the 100 pW-level laser intensity of the laser emitted by the master spacecraft when reaching the slave spacecraft by using the simulated space gravitational wave;
s203, then entering a circulator, performing injection locking on slave laser of the slave laser according to the locked frequency phase difference, amplifying the power of a light beam from 100pW level to 100mW level, dividing the light beam into two beams through a second beam splitter, wherein one beam is used as output light after power amplification so as to meet the watt level requirement of space gravitational wave detection, and the other beam enters a long and stable control system;
s301, two beams of laser input to a long stable control system interfere in an optical fiber coupler;
s302, converting the interference signal into an electric signal through a photoelectric detector;
s303, mixing with a standard signal generated by an ultra-stable clock;
s304, inputting the mixed signal into a phase-locked loop, and outputting a voltage modulation signal by the phase-locked loop;
s305, adjusting the acousto-optic modulator by adopting a voltage modulation signal, and locking the phase of the mixed interference signal, so that the frequency drift of the master laser and the slave laser is in an injection locking range, and the injection locking is ensured not to lose lock.
In a second aspect of the present invention, there is provided an injection type laser phase-locked control device for spatial gravitational wave detection based on the above method, comprising:
the light source modulation system is characterized in that a main laser emits main laser, the polarization state of the main laser is regulated to be consistent with that of a slave laser, and the main laser is divided into two beams, wherein one beam is input into the injection locking system, and the other beam is input into the long stability control system;
the injection locking system is used for receiving one beam of laser emitted by the light source modulation system to perform injection locking on the slave laser of the slave laser, the laser after injection locking is divided into two beams, one beam of laser after injection locking is used as output light after power amplification, and the other beam of laser after injection locking enters the long-stable control system;
the long stable control system is connected with the injection locking system, two laser beams input into the long stable control system generate interference, the phase of an interference signal is locked, the frequency drift of the main laser and the slave laser is limited within the injection locking range, and the injection locking system is controlled through feedback so as to ensure that injection locking is not unlocked.
Further, the injection locking system comprises:
the acousto-optic modulator is connected with the light source modulation system and locks the frequency phases of the master laser and the slave laser;
the optical attenuation sheet is used for attenuating the light intensity of the main laser input into the injection locking system so as to simulate the light intensity of the laser emitted by the main spacecraft when reaching the auxiliary spacecraft in the space gravitational wave detection;
a circulator connected to the optical attenuator and the slave laser, in which the slave laser is injection-locked and the power of the slave laser is amplified once;
the slave laser is used for simulating a slave spacecraft in space gravitational wave detection and emitting slave laser;
the second beam splitter is connected with the circulator and divides the laser after injection locking into two beams, one beam is input into the long stability control system, and the other beam is input into the optical power amplifier;
the optical power amplifier is used for carrying out optical power secondary amplification on the laser beam after injection locking and then taking the laser beam as output light so as to meet the watt level requirement of space gravitational wave detection.
Further, the long stability control system includes:
the optical fiber coupler is connected with the second beam splitter and is used for receiving the laser of the light source modulation system and the injection locking system, and the two laser beams generate interference in the optical fiber coupler;
the photoelectric detector is connected with the optical fiber coupler and converts interference signals in the optical fiber coupler into electric signals;
the mixer is connected with the hyperstable clock and the photoelectric detector and is used for mixing the converted electric signal with a standard signal generated by the hyperstable clock;
and the phase-locked loop is connected with the mixer and controls the acousto-optic modulator according to the mixed frequency difference, so that the frequency drift of the master laser and the slave laser is within the range of injection locking parameters.
Further, the light source modulation system includes:
the main laser is used for simulating a main spacecraft in space gravitational wave detection and emitting main laser;
the light polarization controller is connected with the Faraday isolator, and after the main laser passes through the Faraday isolator, the light polarization controller regulates and controls the polarization state of the main laser to be consistent with the polarization state of the slave laser;
and the first beam splitter divides the main laser after the polarization state regulation into two beams.
Compared with the prior art, the invention has the following beneficial effects:
the method and the device provided by the invention finish the noise control process in the optical domain, avoid the limit of the shot noise of the detector on the phase locking precision, further realize the full-band noise suppression, thereby simulating the laser light intensity (100 pW) when the laser of the main spacecraft reaches the laser of the slave spacecraft for space gravitational wave detection, and after the light power is amplified, the requirement (2W) of space gravitational wave detection can be met, and the 2 pi multiplied by 10 facing the requirement of space gravitational wave detection can be simultaneously met -6 rad/≡hz accuracy requirement.
In addition, the device provided by the invention is also provided with a long-stable control system, and the injection locking system is controlled through automatic feedback, so that the frequency drift of the master laser and the slave laser is kept within the range of injection locking parameters, and the injection locking is ensured not to lose lock, so that the injection locking system has long-term stability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.
FIG. 1 is a schematic flow chart of an injection type laser phase-locked control method facing to space gravitational wave detection in an embodiment of the invention;
FIG. 2 is a schematic diagram of an injection type laser phase-locked control device facing to space gravitational wave detection in an embodiment of the invention;
reference numerals in the drawings:
1-master laser, 2-Faraday isolator, 3-optical polarization controller, 4-first beam splitter, 5-acousto-optic modulator, 6-optical attenuation sheet, 7-circulator, 8-slave laser, 9-second beam splitter, 10-optical power amplifier, 11-optical fiber coupler, 12-photodetector, 13-mixer, 14-ultrastable clock, 15-phase-locked loop.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to meet the high-precision laser phase-locking control requirement in a broadband low-frequency range, the invention provides an injection type laser phase-locking control method for space gravitational wave detection, which is shown in figure 1 and comprises the following steps:
s100, emitting main laser used for simulating laser emitted by a main spacecraft in space gravitational wave detection, and dividing the laser into two beams after regulating and controlling polarization states, wherein one beam is input into an injection locking system for performing injection locking on the slave laser, and the other beam is input into a long stability control system for controlling the injection locking system in a long stability mode.
The concrete contents are as follows:
s101, a main laser emits a milliwatt level main laser, and the parameters of the main laser are basically consistent with those of a main spacecraft in space gravitational wave detection;
s102, after the main laser passes through the Faraday isolator, the polarization state of the laser is regulated and controlled by using an optical fiber polarization controller so as to be consistent with the polarization state of the auxiliary laser, and the auxiliary laser emitted by the auxiliary laser is milliwatt laser.
S103, the regulated main laser is divided into two beams through a first beam splitter.
S200, performing injection locking on the phase of slave laser by using laser used for injection locking through an injection locking system, wherein the slave laser is used for simulating laser emitted by a local spacecraft, the laser after injection locking is divided into two beams, one beam of laser after injection locking is used as output light after power amplification, and the other beam of laser after injection locking enters a long stability control system.
The concrete contents are as follows:
s201, laser used for injection locking is input into an injection locking system, and the frequency phases of a master laser and a slave laser are locked through an acousto-optic modulator.
S202, the optical attenuation sheet is used for attenuating the light intensity of laser used for injection locking, and the optical attenuation sheet is used for simulating space gravitational wave to detect the light intensity of laser emitted by the main spacecraft when the laser reaches the slave spacecraft. When the laser emitted by the main spacecraft reaches the auxiliary spacecraft, the laser is generally attenuated to 10 of the original power -9 It is necessary to provide an optical attenuation sheet to simulate the power attenuation process of the light beam.
S203, the laser enters a circulator, the slave laser of the slave laser is subjected to injection locking according to the locked frequency phase difference, and the modulated slave laser is split into two beams by a second beam splitter after power amplification. One of the beams is amplified in power and then used as output light, and the output light meets the light intensity requirement required by a main spacecraft in space gravitational wave detection.
S300, two input lasers are interfered through a long-stability control system, the phase of interference signals is locked, and the signals are input into an injection locking system and used for controlling the frequency drift of the main laser and the slave laser to be in an injection locking range.
The concrete contents are as follows:
s301, two laser beams input to a long stable control system interfere in an optical fiber coupler.
S302, converting the interference signal into an electric signal through a photoelectric detector.
S303. it is then mixed with a standard signal "generated by an overstable clock.
S304, inputting the mixed signal into a phase-locked loop, and outputting a voltage modulation signal by the phase-locked loop;
s305, adjusting the acousto-optic modulator by adopting a voltage modulation signal, and locking the phase of the mixed interference signal, so that the frequency drift of the master laser and the slave laser is in an injection locking range, and the injection locking is ensured not to lose lock.
In the method, the whole injection locking process has no photoelectric conversion of a photoelectric detector, all noise control processes are completed in an optical domain, the limitation of shot noise of the detector on phase locking precision is avoided, and full-band noise suppression is further realized, so that the laser intensity of the main spacecraft laser detected by the simulated space gravitational wave when reaching the laser of the slave spacecraft is realized, and the requirement of space gravitational wave detection is met after the optical power is amplified.
In a second aspect of the present invention, there is also provided an injection type laser phase-locked control device for space gravitational wave detection based on the above method, as shown in fig. 2, the device includes:
the light source modulation system is characterized in that a main laser 1 emits main laser, the polarization state of the main laser is regulated to be consistent with that of a slave laser 8, and the main laser is divided into two beams, wherein one beam is input into the injection locking system, and the other beam is input into the long stability control system;
the injection locking system is used for receiving one of the laser beams emitted by the light source modulation system to perform injection locking on the slave laser beam of the slave laser 8, the laser beam after injection locking is divided into two beams, one beam of laser beam after injection locking is used as output light after power amplification, and the other beam of laser beam after injection locking enters the long-stable control system;
the long stable control system is connected with the injection locking system, two laser beams input into the long stable control system generate interference, the phase of interference signals is locked, the frequency drift of the master laser beam and the slave laser beam is limited in the injection locking range, and the injection locking system is controlled through feedback so as to ensure that injection locking is not unlocked.
By arranging the injection locking system, the device provided by the invention realizes that the whole injection locking process has no photoelectric conversion of the photoelectric detector, all noise control processes are completed in an optical domain, the problem of limitation of shot noise of the detector on phase locking precision is solved, and full-band noise suppression is realized.
In addition, the device is also provided with a long-stability control system, and the injection locking system is controlled through automatic feedback, so that the frequency drift of the master laser and the slave laser is kept within the range of injection locking parameters, the injection locking is ensured not to lose lock, and the injection locking system has long-term stability.
In the present invention, a light source modulation system includes, in an optical axis direction:
the main laser 1 is used for simulating a main spacecraft in space gravitational wave detection and emitting main laser.
A faraday isolator 2, connected to the main laser 1, prevents the main laser light from returning to the main laser 1.
And the light polarization controller 3 is connected with the Faraday isolator 2, and the light polarization controller 3 regulates the polarization state of the main laser after the main laser passes through the Faraday isolator 2 so as to be consistent with the polarization state of the slave laser 8.
The first beam splitter 4 splits the main laser beam after polarization state regulation into two beams, one beam is input into the injection locking system for injection locking, and the other beam a is input into the long stability control system for long stability control.
As shown in fig. 2, the injection locking system includes:
an acousto-optic modulator 5, coupled to the first beam splitter 4 of the light source modulation system, receives the laser light for injection locking, locks the frequency phase of the master laser 1 and the slave laser 8 to maintain long-term stability of the injection locking.
The optical attenuation sheet 6 attenuates the light intensity of the main laser light input into the injection locking system to simulate the light intensity (in the order of 100 pW) of the laser light emitted by the main spacecraft when reaching the slave spacecraft in the space gravitational wave detection.
A circulator 7 connected to the optical attenuator 6 and the slave laser 8, the slave laser 8 being injection-locked in the circulator 7 and the power of the slave laser being amplified once to allow the power to be amplified from the pW level to the 100mW level.
The injection locking function enables full band noise suppression and power amplification from the pW level to the 100mW level. As can be seen from the above, there is no photoelectric conversion of the photodetector 12 in the current injection locking process, and all noise control processes are completed in the optical domain, which is a physical basis for avoiding limitation of shot noise of the detector on phase locking accuracy.
The slave laser 8 is used for simulating a slave spacecraft in space gravitational wave detection, emitting slave laser and inputting the slave laser into the circulator 7, and realizing the regeneration and amplification of a main laser signal after modulation.
And a second beam splitter 9 connected to the circulator 7 for splitting the injection-locked laser light into two beams, one beam b being input to the long stability control system and the other beam being input to the optical power amplifier 10.
The optical power amplifier 10 is configured to perform optical power secondary amplification on the injection-locked laser beam to obtain output light, so that the output light meets the light intensity requirement required by the main spacecraft in the space gravitational wave detection.
The main reason for using the optical power amplifier 10 to perform power secondary amplification on the injection-locked laser light is that the optical power (typically several hundred milliwatts) from the laser 8 is typically of the semiconductor type and does not meet the requirement of spatial gravitational wave detection (2W).
In addition, in order to achieve the best phase locking effect, the devices adopted by the light source modulation system and the injection locking system are polarization-preserving devices.
Because the detection wave source of the space gravitational wave detection is mainly concentrated at the middle and low frequency of 0.1mHz-1Hz, the laser phase-locked control system is required to have long-term stability, and meanwhile, in order to prevent the unlocking caused by the influence of non-conservative force-abrupt signals such as astronomical gravitational gradient, interplanetary magnetic field, solar wind, solar radiation, cosmic rays, astronomical occasional events and the like on a spacecraft, the long-term stability of the laser injection phase-locked control is ensured by the long-term stability control system.
In the device, the long stability control system comprises:
an optical fiber coupler 11 is connected to the second beam splitter 9 for receiving the laser light of the light source modulation system and the injection locking system, and the two laser light a and b interfere in the optical fiber coupler 11.
The photodetector 12 is connected to the optical fiber coupler 11, and converts the interference signal in the optical fiber coupler 11 into an electrical signal.
And the mixer 13 is connected with the hyperstable clock 14 and the photoelectric detector 12 and is used for mixing the converted electric signal with a standard signal generated by the hyperstable clock 14.
Two signals in the mixer 13: one is a standard signal "generated by the hyperstable clock 14, which is an electrical signal, and the other is an electrical signal generated by the conversion of the interference light by the photodetector 12. The frequency difference of the two electrical signals is output via the mixer 13. Since the frequency of the standard signal is constant, if the frequency of the interference light changes, the mixing signal changes, whereby the frequency and phase of the laser can be locked by means of the phase locked loop 15.
A phase locked loop 15, connected to the mixer 13, controls the acousto-optic modulator 5 according to the mixed frequency difference such that the frequency drift of the master laser 1 and the slave laser 8 is within the injection locking parameters.
It should be noted that the main function of the long-stable control system is to keep the frequency drift of the master and slave lasers within the set threshold value of the injection locking parameter, so as to ensure that the injection locking is not unlocked. Therefore, the phase-locked control accuracy required here is not so strict, and shot noise caused by the photodetector is negligible.
The invention applies the laser injection locking technical scheme to the laser weak light phase locking control technology facing the space gravitational wave detection, adopts the novel scheme of laser injection weak light phase locking control to solve the shot noise bottleneck problem faced by classical analog and digital phase locking control, and can meet the high-precision laser phase locking control requirement in the broadband low-frequency range.
Example 1
In order to further prove that the invention can meet the high-precision laser phase-locking control requirement in the broadband low-frequency range of 0.1mHz-1Hz, the embodiment 1 is specifically provided.
S101, a main laser emits a milliwatt level main laser, and the main laser is used for simulating the laser emitted by a main spacecraft in space gravitational wave detection;
s102, after the main laser passes through the Faraday isolator, regulating the polarization state of the laser by using an optical fiber polarization controller so as to be consistent with the polarization state of the slave laser; wherein the slave laser is used for simulating the laser emitted by the local spacecraft;
s103, dividing the regulated main laser into two beams through a first beam splitter, wherein one beam is input into an injection locking system for input locking, and the other beam is input into a long stability control system for long stability control;
s201, inputting laser used for injection locking into an injection locking system, and locking the frequency phases of a master laser and a slave laser through an acousto-optic modulator;
s202, utilizing an optical attenuation sheet to attenuate the light intensity of laser used for injection locking into the 100 pW-level laser intensity, and detecting the 100 pW-level laser intensity of the laser emitted by the master spacecraft when reaching the slave spacecraft by using the simulated space gravitational wave;
s203, then entering a circulator, performing injection locking on slave laser of the slave laser according to the locked frequency phase difference, amplifying the power of a light beam from 100pW level to 100mW level, dividing the light beam into two beams through a second beam splitter, wherein one beam reaches W level as output light after power amplification, and the other beam enters a long-stable control system;
s301, two beams of laser input to a long stable control system interfere in an optical fiber coupler;
s302, converting the interference signal into an electric signal through a photoelectric detector;
s303, mixing with a standard signal generated by an ultra-stable clock;
s304, inputting the mixed signal into a phase-locked loop, and outputting a voltage modulation signal by the phase-locked loop;
s305, adjusting the acousto-optic modulator by adopting a voltage modulation signal, and locking the phase of the mixed interference signal, so that the frequency drift of the master laser and the slave laser is in an injection locking range, and the injection locking is ensured not to lose lock.
The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application, the scope of which is defined by the claims. Various modifications and equivalent arrangements may be made to the present application by those skilled in the art, which modifications and equivalents are also considered to be within the scope of the present application.
Claims (7)
1. The injection type laser phase-locking control method for space gravitational wave detection is characterized by comprising the following steps of:
s100, emitting main laser, namely simulating laser emitted by a main spacecraft in space gravitational wave detection, and dividing the laser into two beams after regulating and controlling polarization states, wherein one beam is input into an injection locking system for performing injection locking on the slave laser, and the other beam is input into a long stability control system for long stability control;
s200, performing injection locking on the phase of slave laser by using laser used for injection locking through an injection locking system, wherein the slave laser is used for simulating laser emitted by a local spacecraft, the laser after injection locking is divided into two beams, one beam of laser after injection locking is used as output light after power amplification, and the other beam of laser after injection locking enters a long stability control system;
the laser used for injection locking is input into an injection locking system, and the frequency phases of the master laser and the slave laser are locked through an acousto-optic modulator;
the optical attenuation sheet is used for attenuating the light intensity of the laser used for injection locking, and is used for simulating the space gravitational wave to detect the light intensity of the laser emitted by the main spacecraft when the laser reaches the local spacecraft;
then enters a circulator, injection locking is carried out on the secondary laser according to the locked frequency phase difference, and the modulated secondary laser is divided into two beams by a second beam splitter after power amplification;
s300, two input lasers are interfered through a long-stability control system, the phase of interference signals is locked, and the signals are input into an injection locking system and used for controlling the frequency drift of the main laser and the slave laser to be in an injection locking range.
2. The method for controlling injection type laser phase lock for space gravitational wave detection according to claim 1, wherein,
the specific content of the step S300 is as follows:
s301, two beams of laser input to a long stable control system interfere in an optical fiber coupler;
s302, converting the interference signal into an electric signal through a photoelectric detector;
s303, mixing with a standard signal generated by an ultra-stable clock;
s304, inputting the mixed signal into a phase-locked loop, and outputting a voltage modulation signal by the phase-locked loop;
s305, adjusting an acousto-optic modulator by adopting a voltage modulation signal, and locking the phase of the mixed interference signal, so that the frequency drift of the master laser and the slave laser is in an injection locking range, and the injection locking is ensured not to lose lock.
3. The method for controlling injection type laser phase lock for space gravitational wave detection according to claim 1, wherein,
the specific content of the step S100 is as follows:
s101, emitting main laser;
s102, after the main laser passes through the Faraday isolator, regulating the polarization state of the laser by using a light polarization controller so as to be consistent with the polarization state of the auxiliary laser;
s103, the regulated main laser is divided into two beams through a first beam splitter.
4. The method for controlling injection type laser phase lock for space gravitational wave detection according to claim 1, wherein,
s101, emitting a milliwatt-level main laser used for simulating the laser emitted by a main spacecraft in space gravitational wave detection;
s102, after the main laser passes through the Faraday isolator, regulating the polarization state of the laser by using a light polarization controller so as to be consistent with the polarization state of the auxiliary laser; wherein the slave laser is used for simulating the laser emitted by the local spacecraft;
s103, dividing the regulated main laser into two beams through a first beam splitter, wherein one beam is input into an injection locking system for injection locking, and the other beam is input into a long stability control system for long stability control;
s201, inputting laser used for injection locking into an injection locking system, and locking the frequency phases of a master laser and a slave laser through an acousto-optic modulator;
s202, attenuating the light intensity of laser used for injection locking into 100 pW-level laser intensity by using an optical attenuation sheet, and detecting the 100 pW-level laser intensity when the emitted laser of the main spacecraft reaches the local spacecraft by using an analog space gravitational wave;
s203, then entering a circulator, performing injection locking on slave laser according to the locked frequency phase difference, amplifying the power of a light beam from 100pW level to 100mW level, dividing the power into two beams through a second beam splitter, wherein one beam is used as output light after power amplification so as to meet the watt level requirement of space gravitational wave detection, and the other beam enters a long stability control system;
s301, two beams of laser input to a long stable control system interfere in an optical fiber coupler;
s302, converting the interference signal into an electric signal through a photoelectric detector;
s303, mixing with a standard signal generated by an ultra-stable clock;
s304, inputting the mixed signal into a phase-locked loop, and outputting a voltage modulation signal by the phase-locked loop;
s305, adjusting an acousto-optic modulator by adopting a voltage modulation signal, and locking the phase of the mixed interference signal, so that the frequency drift of the master laser and the slave laser is in an injection locking range, and the injection locking is ensured not to lose lock.
5. Injection type laser phase-locked control device towards space gravitational wave detection, its characterized in that includes:
the light source modulation system is characterized in that a main laser emits main laser, the polarization state of the main laser is regulated to be consistent with that of a slave laser, and the main laser is divided into two beams, wherein one beam is input into the injection locking system, and the other beam is input into the long stability control system;
the injection locking system is used for receiving one beam of laser emitted by the light source modulation system to perform injection locking on the slave laser of the slave laser, the laser after injection locking is divided into two beams, one beam of laser after injection locking is used as output light after power amplification, and the other beam of laser after injection locking enters the long-stable control system;
the long stable control system is connected with the injection locking system, two laser beams input into the long stable control system generate interference, the phase of an interference signal is locked, the frequency drift of the main laser and the slave laser is limited within the injection locking range, and the injection locking system is controlled through feedback so as to ensure that injection locking is not lost;
the injection locking system includes:
the acousto-optic modulator is connected with the light source modulation system and locks the frequency phases of the master laser and the slave laser;
the optical attenuation sheet is used for attenuating the light intensity of the main laser input into the injection locking system so as to simulate the light intensity of the laser emitted by the main spacecraft when reaching the auxiliary spacecraft in the space gravitational wave detection;
a circulator connected to the optical attenuator and the slave laser, in which the slave laser is injection-locked and the power of the slave laser is amplified once;
the slave laser is used for simulating a slave spacecraft in space gravitational wave detection and emitting slave laser;
the second beam splitter is connected with the circulator and divides the laser after injection locking into two beams, one beam is input into the long stability control system, and the other beam is input into the optical power amplifier;
the optical power amplifier is used for carrying out optical power secondary amplification on the laser beam after injection locking and then taking the laser beam as output light so as to meet the watt level requirement of space gravitational wave detection.
6. The spatial gravitational wave detection oriented injection type laser phase lock control device according to claim 5, wherein,
the long stability control system includes:
the optical fiber coupler is connected with the second beam splitter and is used for receiving the laser of the light source modulation system and the injection locking system, and the two laser beams generate interference in the optical fiber coupler;
the photoelectric detector is connected with the optical fiber coupler and converts interference signals in the optical fiber coupler into electric signals;
the mixer is connected with the hyperstable clock and the photoelectric detector and is used for mixing the converted electric signal with a standard signal generated by the hyperstable clock;
and the phase-locked loop is connected with the mixer and controls the acousto-optic modulator according to the mixed frequency difference, so that the frequency drift of the master laser and the slave laser is within the range of injection locking parameters.
7. The spatial gravitational wave detection oriented injection type laser phase lock control device according to claim 5, wherein,
the light source modulation system includes:
the main laser is used for simulating a main spacecraft in space gravitational wave detection and emitting main laser;
the light polarization controller is connected with the Faraday isolator, and after the main laser passes through the Faraday isolator, the light polarization controller regulates and controls the polarization state of the main laser to be consistent with the polarization state of the slave laser;
and the first beam splitter divides the main laser after the polarization state regulation into two beams.
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| CN103234515A (en) * | 2013-04-19 | 2013-08-07 | 中国科学院力学研究所 | Simulating method and device for dim light phase locking technology of spatial laser interference system |
| CN114122888A (en) * | 2021-10-22 | 2022-03-01 | 中国科学院国家授时中心 | Frequency-tunable and transportable frequency-stabilized laser system for optical clock |
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| CN103234515A (en) * | 2013-04-19 | 2013-08-07 | 中国科学院力学研究所 | Simulating method and device for dim light phase locking technology of spatial laser interference system |
| CN114122888A (en) * | 2021-10-22 | 2022-03-01 | 中国科学院国家授时中心 | Frequency-tunable and transportable frequency-stabilized laser system for optical clock |
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