CN111106511A - Frequency synchronization passive mode-locking fiber laser and method for realizing frequency synchronization - Google Patents
Frequency synchronization passive mode-locking fiber laser and method for realizing frequency synchronization Download PDFInfo
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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- 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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- 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
- H01S3/101—Lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted
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- H—ELECTRICITY
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- 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
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
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- 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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
Abstract
The invention discloses a frequency synchronization passive mode-locking fiber laser and a method for realizing frequency synchronization, wherein the frequency synchronization passive mode-locking fiber laser comprises a passive mode-locking fiber laser, a frequency locking device and an external signal source, the passive mode-locking fiber laser comprises a guide rail with a stepping motor, piezoelectric ceramics and a resonant cavity, and the frequency locking device comprises a photoelectric detector, a filter, a frequency mixer and a servo system which are electrically connected in sequence. The frequency locking device converts an optical signal output by the passive mode-locking fiber laser into an electric signal, the electric signal passes through the filter and the frequency mixer to obtain a differential signal, the differential signal is processed by the servo system and then fed back to the piezoelectric ceramic, and the cavity length of the passive mode-locking fiber laser is adjusted through the piezoelectric ceramic, so that the repetition frequency of the passive mode-locking fiber laser is synchronous with an external signal source. The invention has simple and compact structure and large adjustable range of synchronous frequency, and is suitable for the fields of precision machining, frequency calibration, cold atoms and the like.
Description
Technical Field
The invention relates to the technical field of fiber lasers, in particular to a frequency synchronization passive mode-locking fiber laser and a method for realizing frequency synchronization.
Background
The femtosecond laser has the characteristics of ultrashort pulse, high peak power and the like, so that the femtosecond laser has important application prospect in the field of micro-precision machining, and particularly the femtosecond laser with the frequency synchronous with an external signal source can enable the micro-precision machining to be more precise and efficient. At present, two modes of a femtosecond laser are mainly realized by active mode locking and passive mode locking, for the active mode locking femtosecond laser, the repetition frequency of the femtosecond laser can be changed by changing the modulation frequency of an electric signal, so that the synchronization of the femtosecond laser and an external signal source can be realized by synchronizing the electric signal of the laser with the external signal source, and the method has the advantages of large tuning range (to repetition frequency) and simple operation, but introduces complex electrical equipment, and increases the cost and the complexity of a system; for the passive mode-locked laser, because the passive mode-locked laser does not need to be externally connected with an electrical modulation signal, the system has a simple structure, and the change of repetition frequency can be realized directly by regulating and controlling optical elements such as the length or gain of a laser resonant cavity.
At present, two main ways are available for realizing the synchronization of the frequency of a laser and the frequency of an external signal source in a passive mode-locked laser, namely, the power in a resonant cavity of the laser is changed to make the refractive index of a gain fiber slightly change and change the cavity length of the resonant cavity, so that the repetition frequency of the laser is changed; secondly, stress is added to the optical fiber in the resonant cavity of the laser, for example, the optical fiber is extruded by piezoelectric ceramics, the refractive index of the optical fiber is changed, the cavity length of the resonant cavity is changed, and the repetition frequency of the laser is changed. However, the cavity length change caused by the two modes is often in the micrometer order, and when the two modes are applied to a conventional passive mode-locked laser with repetition frequency of tens of megahertz, the cavity length of the resonant cavity is often in the range of several meters to dozens of meters, the cavity length change is extremely small, the range of the adjusted repetition frequency is limited, and the practical application is influenced to a certain extent.
Disclosure of Invention
The invention aims to provide a frequency synchronization passive mode-locking optical fiber laser which has a simple structure and a large repetition frequency tunable range in view of the current situation.
In order to achieve the purpose, the invention adopts the technical scheme that:
a frequency synchronization passive mode-locking fiber laser is characterized by comprising a passive mode-locking fiber laser, a frequency locking device and an external signal source, wherein the passive mode-locking fiber laser comprises a saturable absorption mirror, piezoelectric ceramics, a guide rail with a stepping motor, a collimator, a doped fiber, a dichroic mirror, a wavelength division multiplexer, a pump laser and at least one coupler, the doped fiber, the collimator and the saturable absorption mirror form a resonant cavity of the mode-locking fiber laser, the wavelength division multiplexer is connected with the pump laser, the saturable absorption mirror is pasted on the piezoelectric ceramics and fixed with the guide rail with the stepping motor, the frequency locking device is used for processing optical signals generated by the passive mode-locking fiber laser and electric signals of the external signal source and feeding back the processing result to the passive mode-locking fiber laser, the passive mode-locked fiber laser moves a guide rail with a stepping motor or changes the voltage of piezoelectric ceramics according to the received feedback to change the length of a resonant cavity, thereby changing the repetition frequency of the laser.
Furthermore, the frequency locking device comprises a photoelectric detector, a filter, a frequency mixer and a servo system which are electrically connected in sequence, the photoelectric detector is connected with the resonant cavity, the frequency mixer is also electrically connected with an external signal source, the servo system is electrically connected with the piezoelectric ceramics, the photoelectric detector is used for converting an optical signal output by the passive mode-locking fiber laser into an electric signal, the electric signal enters the frequency mixer after passing through the filter, the frequency mixer mixes the repetition frequency of the passive mode-locking fiber laser with the frequency of the external signal source to obtain a differential signal, and the servo system carries out filtering, proportional operation, integral operation and high-voltage amplification processing on the differential signal and feeds back the differential signal to the piezoelectric ceramics.
Further, the coupler includes a first coupler, the resonant cavity is a linear cavity, the resonant cavity further includes a dichroic mirror, the dichroic mirror is located between the doped optical fiber and the wavelength division multiplexer, the first coupler includes a first input port, a first output port and a second output port, the first input port is connected to the wavelength division multiplexer, the first output port is used for outputting pulse laser, and the second output port is connected to the photodetector.
Further, the coupler comprises a second coupler and a third coupler, the resonant cavity is a ring cavity, the circulator further includes a wavelength division multiplexer, a circulator, and a second coupler, the circulator including a first port, a second port, and a third port, the second coupler comprising a second input port, a third output port, and a fourth output port, the third coupler comprising a third input port, a fifth output port, and a sixth output port, the second input port is connected with the wavelength division multiplexer, the third output interface is connected with a third input interface, the fourth output interface is connected with the first port, the second port and the third port are respectively connected with the collimator and the doped fiber to form an annular cavity, the fifth output port is used for outputting pulse laser, and the sixth output port is connected with the photoelectric detector.
Further, be space light path structure between saturable absorption mirror and the collimater, be full fiber structure between pump laser, wavelength division multiplexer, doping optic fibre and the collimater, be single mode polarization maintaining fiber between pump laser and the wavelength division multiplexer, be single mode polarization maintaining fiber between wavelength division multiplexer, doping optic fibre and the collimater.
Further, the collimation distance of the collimator is larger than 1 m.
Further, the frequency range of the external signal source is 20 MHz-80 MHz.
A frequency synchronization passive mode-locking fiber laser, the method for realizing the frequency synchronization comprises the following steps:
s1: turning on an external signal source, and setting the frequency of the external signal source;
s2: increasing the current of a pump laser until the mode locking is successful, moving a guide rail with a stepping motor to change the cavity length of a resonant cavity, and enabling the repetition frequency of the passive mode locking fiber laser to be consistent with the frequency of an external signal source;
s3: and feeding back an output signal of the servo system to the piezoelectric ceramic, and adjusting parameters of the servo system until the repetition frequency of the passive mode-locking fiber laser is synchronized with the frequency of an external signal source.
Further, when the resonant cavity in step S2 is a linear cavity, the cavity length is the distance between the dichroic mirror and the saturable absorber mirror.
Further, when the resonant cavity in step S2 is a ring cavity, the cavity length is the length of the ring cavity formed by the wavelength division multiplexer, the doped fiber, the circulator, the collimator, and the second coupler plus the distance between the collimator and the saturable absorber mirror.
The invention has the beneficial effects that: the invention provides a novel frequency synchronization passive mode-locking fiber laser, which can realize synchronization with an external signal source under a large-range frequency domain through the dual functions of a guide rail with a stepping motor and piezoelectric ceramics. For a conventional passive mode-locking fiber laser, the repetition frequency range is 20-80 MHz, and if the laser has a frequency selection function, the passive mode-locking fiber laser can realize the synchronization with an external signal source under the full frequency domain of 20-80 MHz. The invention has simple structure and wide frequency adjusting range, provides a new method for synchronizing the frequency of the femtosecond laser and the frequency of an external signal source, and has larger application prospect.
Drawings
Fig. 1 is a schematic diagram of a frequency-synchronized passively mode-locked fiber laser according to an embodiment of the present invention;
fig. 2 is another frequency-synchronized passively mode-locked fiber laser according to the second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.
The first embodiment is as follows:
the embodiment of the invention provides a frequency synchronization passive mode-locking fiber laser, which comprises a passive mode-locking fiber laser 11, a frequency locking device 12 and an external signal source 13.
As shown in fig. 1, a passive mode-locked fiber laser 11 is a light source section of the present invention, and includes: the passive mode-locked fiber laser comprises a guide rail 101 with a stepping motor, piezoelectric ceramics 102, a saturable absorption mirror 103, a pump laser 108, a collimator 104, a doped fiber 105, a dichroic mirror 106, a wavelength division multiplexer 107 and a first coupler 109 which are coupled in sequence, wherein the saturable absorption mirror 103, the collimator 104, the doped fiber 105 and the dichroic mirror 106 form a linear cavity of the passive mode-locked fiber laser 11.
The pump laser 108 is connected with the wavelength division multiplexer 107, the pump laser 108 is used for generating pump light for exciting the doped optical fiber 105, the pump laser 108, the wavelength division multiplexer 107, the dichroic mirror 106, the doped optical fiber 105, the collimator 104 and the first coupler 109 are all optical fiber structures, the pump laser 108 is connected with the wavelength division multiplexer 107 through a single-mode non-polarization-maintaining optical fiber, the wavelength division multiplexer 107, the dichroic mirror 106, the doped optical fiber 105, the first coupler 109 and the collimator 104 are connected through a single-mode polarization-maintaining optical fiber, the saturable absorber 103 is bonded with the piezoelectric ceramic 102 through ultraviolet curing glue and fixed on the guide rail 101 with the stepping motor together, a space optical path structure is arranged between the collimator 104 and the saturable absorber 103, and the angle between the collimator 104 and the saturable absorber 103 is adjusted to achieve a mode locking condition. The first input interface of the first coupler 109 is connected to the wavelength division multiplexer 107, the splitting ratio of the first coupler 109 is 90:10, wherein 90% of the optical signal is output from the first output port 1 as a laser pulse, and 10% of the optical signal is output from the second output port to the frequency locking device 12 for photoelectric conversion.
In this embodiment, the cavity length of the passive mode-locked fiber laser 11 is the distance between the dichroic mirror 106 and the saturable absorber mirror 103, and the cavity length of the resonant cavity can be changed by moving the guide rail 101 with the stepping motor or changing the voltage of the piezoelectric ceramic 102, thereby changing the repetition frequency of the passive mode-locked fiber laser 11.
The frequency locking device 12 is used for frequency synchronization between the passive mode-locked fiber laser 11 and the external signal source 13, the frequency locking device 12 includes a photodetector 110, a filter 111, a mixer 112, and a servo system 113, the photodetector 110 is connected to the second output end of the first coupler 109, and the servo system 113 is electrically connected to the piezoelectric ceramic 102. The photodetector 110 converts an optical signal output by the passive mode-locked fiber laser 11 into an electrical signal, the electrical signal passes through the filter 111 and enters the mixer 112, the mixer 112 mixes the repetition frequency of the passive mode-locked fiber laser 11 with the frequency of the external signal source 13 to obtain a differential signal, namely, a difference value between the two frequencies, the servo system 113 processes the differential signal, the processing includes filtering, proportional operation, integral operation and high-voltage amplification, the processed differential signal is fed back to the piezoelectric ceramic 102, and the piezoelectric ceramic 102 rapidly modulates the cavity length of the linear cavity of the passive mode-locked fiber laser 11, so that the frequency synchronization between the passive mode-locked fiber laser 11 and the external signal source 23 is realized.
In this embodiment, the collimation distance of the collimator 104 is larger than 1m, so that it can be ensured that the passive mode-locked fiber laser 11 is still locked when the guide rail 101 with the stepping motor is moved over a large range. The external signal source 13 provides a frequency reference for realizing the frequency synchronization of the passive mode-locked fiber laser 11 of the present invention, wherein the frequency range is 20-80 MHz, and the frequency range is consistent with the conventional mode-locked repetition frequency of the passive mode-locked fiber laser 11.
After the frequency synchronization passive mode-locking fiber laser shown in fig. 1 is built, the specific operation steps for realizing frequency synchronization are as follows:
step S101: turning on the external signal source 13, and setting the frequency of the external signal source 13;
step S102: increasing the current of the pump laser 108 until the mode locking is successful, moving the guide rail 101 with the stepping motor to change the cavity length of the linear cavity, so that the repetition frequency of the passive mode locking fiber laser 11 is consistent with the frequency of the external signal source 13;
step S103: and feeding back an output signal of the servo system 113 to the piezoelectric ceramic 102, and adjusting proportional operation and integral operation parameters of the servo system 113 until the repetition frequency of the passive mode-locked fiber laser 11 is synchronized with the frequency of the external signal source 13.
Example two:
the second embodiment of the present invention provides another frequency-synchronized passively mode-locked fiber laser, which includes a passively mode-locked fiber laser 21, a frequency locking device 22, and an external signal source 23.
As shown in fig. 2, a passive mode-locked fiber laser 21 is a light source section of the present invention, and includes: a guide rail 201 with a stepping motor, a piezoelectric ceramic 202, a saturable absorption mirror 203, a pump laser 208, and a collimator 204, a doped fiber 205, a circulator 206, a wavelength division multiplexer 207, a second coupler 2091, and a third coupler 2092 coupled in sequence, wherein the saturable absorption mirror 203, the collimator 204, the doped fiber 205, the circulator 206, the wavelength division multiplexer 207, and the second coupler 2091 constitute a ring cavity of the passive mode-locked fiber laser 21.
The pump laser 208 is connected with the wavelength division multiplexer 207, the pump laser 208 is used for generating pump light for exciting the doped fiber 205, the pump laser 208, the wavelength division multiplexer 207, the circulator 206, the doped fiber 205, the collimator 204, the second coupler 2091 and the third coupler 2092 are in an all-fiber structure, the pump laser 208 is connected with the wavelength division multiplexer 207 through a single-mode non-polarization-maintaining fiber, the wavelength division multiplexer 207, the circulator 206, the doped fiber 205, the second coupler 2091, the third coupler 2092 and the collimator 204 are connected through a single-mode polarization-maintaining fiber, the saturable absorption mirror 203 is bonded with the piezoelectric ceramic 202 through ultraviolet curing glue and fixed on the guide rail 201 with the stepping motor together, a spatial optical path structure is formed between the collimator 204 and the saturable absorption mirror 203, and the angle between the collimator 204 and the saturable absorption mirror 203 is adjusted to achieve a mode locking condition. A second input interface of the second coupler 2091 is connected to the wavelength division multiplexer 207, a second port and a third port of the circulator 206 are connected to the collimator 204 and the doped fiber 205, respectively, and a third output port of the second coupler 2091 is connected to the first port of the circulator 206 to form a ring cavity. The splitting ratio of the second coupler 2091 is 90:10, where 90% of the optical signal is output from the fourth output port to the circulator 206 and 10% of the optical signal is output from the third output port to the third coupler 2092; the third coupler 2092 has a splitting ratio of 90:10, where 90% of the optical signal is output as laser pulses from the fifth output port 2 and 10% of the optical signal is output from the sixth output port to the frequency locking device 22 for photoelectric conversion.
In this embodiment, the cavity length of the passive mode-locked fiber laser 21 is the length of the ring cavity formed by the wavelength division multiplexer 207, the doped fiber 205, the circulator 206, the collimator 204, and the second coupler 2091 plus the distance between the collimator 204 and the saturable absorber 203, and the cavity length can be changed by moving the guide rail 201 with the stepping motor or changing the voltage of the piezoelectric ceramic 202, thereby changing the repetition frequency of the passive mode-locked fiber laser 21.
The frequency locking device 22 is used for frequency synchronization between the passive mode-locked fiber laser 21 and the external signal source 23, and includes a photodetector 210, a filter 211, a mixer 212, and a servo system 213, wherein the photodetector 210 is connected to the second output terminal of the first coupler 209, and the servo system 213 is electrically connected to the piezoelectric ceramic 202. The optical signal output by the passive mode-locked fiber laser 21 is converted into an electrical signal by the optical detector 210, and enters the mixer 212 after passing through the filter 211, the mixer 212 mixes the repetition frequency of the passive mode-locked fiber laser 21 with the frequency of the external signal source 23 to obtain a differential signal, i.e. a difference value between the two frequencies, the servo system 213 processes the differential signal, including filtering, proportional operation, integral operation and high-voltage amplification, the processed differential signal is fed back to the piezoelectric ceramic 202, and the piezoelectric ceramic 202 rapidly modulates the cavity length of the ring cavity of the passive mode-locked fiber laser 21, thereby realizing the frequency synchronization between the passive mode-locked fiber laser 21 and the external signal source 23.
In this embodiment, the collimation distance of the collimator 204 is larger than 1m, so that it can be ensured that the mode-locking of the passive mode-locked fiber laser 21 is still established when the guide rail 201 with the stepping motor is moved over a large range. The external signal source 23 provides a frequency reference for realizing frequency synchronization of the passive mode-locked fiber laser 21 according to the present invention, wherein the frequency range is 20-80 MHz, and the frequency range is consistent with the conventional mode-locked repetition frequency of the passive mode-locked fiber laser 21.
After the other frequency synchronization passive mode-locking fiber laser shown in fig. 2 is built, the specific operation steps for realizing frequency synchronization are as follows:
step S201: turning on the external signal source 23, and setting the frequency of the external signal source 23;
step S202: increasing the current of the pump laser 208 until the mode locking is successful, moving the guide rail 201 with the stepping motor to change the cavity length of the linear cavity, so that the repetition frequency of the passive mode locking fiber laser 21 is consistent with the frequency of the external signal source 23;
step S203: the output signal of the servo system 213 is fed back to the piezoelectric ceramic 202, and the proportional operation and integral operation parameters of the servo system 213 are adjusted until the repetition frequency of the passive mode-locked fiber laser 21 is synchronized with the frequency of the external signal source 23.
In the description of the present invention, it is to be noted that the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically indicated and limited. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
The foregoing is considered as illustrative of the preferred embodiments of the invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A frequency synchronization passive mode-locking fiber laser is characterized by comprising a passive mode-locking fiber laser, a frequency locking device and an external signal source, wherein the passive mode-locking fiber laser comprises a saturable absorption mirror, piezoelectric ceramics, a guide rail with a stepping motor, a collimator, a doped fiber, a dichroic mirror, a wavelength division multiplexer, a pump laser and at least one coupler, the doped fiber, the collimator and the saturable absorption mirror form a resonant cavity of the mode-locking fiber laser, the wavelength division multiplexer is connected with the pump laser, the saturable absorption mirror is pasted on the piezoelectric ceramics and fixed with the guide rail with the stepping motor, the frequency locking device is used for processing optical signals generated by the passive mode-locking fiber laser and electric signals of the external signal source and feeding back the processing result to the passive mode-locking fiber laser, the passive mode-locked fiber laser moves a guide rail with a stepping motor or changes the voltage of piezoelectric ceramics according to the received feedback to change the length of a resonant cavity, thereby changing the repetition frequency of the laser.
2. The frequency synchronization passive mode-locked fiber laser of claim 1, wherein the frequency locking device comprises a photodetector, a filter, a mixer and a servo system electrically connected in sequence, the photodetector is connected to an output end of the passive mode-locked fiber laser, the mixer is further electrically connected to the external signal source, the servo system is electrically connected to the piezoelectric ceramic, the photodetector is configured to convert an optical signal output by the passive mode-locked fiber laser into an electrical signal, the electrical signal enters the mixer after passing through the filter, the mixer mixes a repetition frequency of the passive mode-locked fiber laser with a frequency of the external signal source to obtain a differential signal, and the servo system performs filtering, proportional operation, integral operation and high-voltage amplification on the differential signal and feeds back the differential signal to the piezoelectric ceramic.
3. The frequency-synchronized passively mode-locked fiber laser of claim 1, wherein the coupler comprises a first coupler, the resonant cavity is a linear cavity, the resonant cavity further comprises a dichroic mirror, the dichroic mirror is located between the doped fiber and a wavelength division multiplexer, the first coupler comprises a first input port, a first output port, and a second output port, the first input port is connected to the wavelength division multiplexer, the first output port is used for outputting pulsed laser light, and the second output port is connected to the photodetector.
4. The frequency-synchronized passive mode-locked fiber laser of claim 1, wherein the coupler comprises a second coupler and a third coupler, the resonant cavity is a ring cavity, the circulator further comprises a wavelength division multiplexer, a circulator and a second coupler, the circulator comprises a first port, a second port and a third port, the second coupler comprises a second input port, a third output port and a fourth output port, the third coupler comprises a third input port, a fifth output port and a sixth output port, the second input port is connected to the wavelength division multiplexer, the third output port is connected to a third input port, the fourth output port is connected to the first port, the second port and the third port are respectively connected to the collimator and the doped fiber to form a ring cavity, and the fifth output port is used for outputting pulsed laser, the sixth output port is connected with the photoelectric detector.
5. The frequency-synchronized passively mode-locked fiber laser according to claim 3 or 4, wherein a spatial optical path structure is arranged between the saturable absorber mirror and the collimator, an all-fiber structure is arranged between the pump laser, the wavelength division multiplexer, the doped fiber and the collimator, a single-mode non-polarization-maintaining fiber is arranged between the pump laser and the wavelength division multiplexer, and a single-mode polarization-maintaining fiber is arranged between the wavelength division multiplexer, the doped fiber and the collimator.
6. The frequency-synchronized passively mode-locked fiber laser of claim 3 or 4, wherein a collimation distance of the collimator is greater than 1 m.
7. The frequency-synchronized passively mode-locked fiber laser according to claim 3 or 4, wherein the frequency range of the external signal source is 20MHz to 80 MHz.
8. A frequency synchronized passively mode-locked fiber laser as claimed in claim 1, wherein the method of achieving frequency synchronization comprises the steps of:
s1: turning on an external signal source, and setting the frequency of the external signal source;
s2: increasing the current of a pump laser until the mode locking is successful, moving a guide rail with a stepping motor to change the cavity length of a resonant cavity, and enabling the repetition frequency of the passive mode locking fiber laser to be consistent with the frequency of an external signal source;
s3: and feeding back an output signal of the servo system to the piezoelectric ceramic, and adjusting parameters of the servo system until the repetition frequency of the passive mode-locking fiber laser is synchronized with the frequency of an external signal source.
9. The method according to claim 8, wherein when the resonant cavity is a linear cavity in step S2, the cavity length is the distance between the dichroic mirror and the saturable absorption mirror.
10. The method according to claim 8, wherein when the resonant cavity in step S2 is a ring cavity, its cavity length is the length of the ring cavity formed by the wavelength division multiplexer, the doped fiber, the circulator, the collimator and the second coupler plus the distance between the collimator and the saturable absorber mirror.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113206434A (en) * | 2021-05-07 | 2021-08-03 | 北京邮电大学 | Pre-compensation feedback control system and method for frequency difference locking of fiber laser |
| CN114205003A (en) * | 2021-12-09 | 2022-03-18 | 北京邮电大学 | Fast and slow loop combined feedback control system and method for locking signal light and local oscillator light frequency difference signal of optical fiber link |
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| CN114205003A (en) * | 2021-12-09 | 2022-03-18 | 北京邮电大学 | Fast and slow loop combined feedback control system and method for locking signal light and local oscillator light frequency difference signal of optical fiber link |
| CN114205003B (en) * | 2021-12-09 | 2023-10-20 | 北京邮电大学 | Fast and slow loop combined feedback control system and method for locking signal light and local oscillation optical frequency difference signal of optical fiber link |
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