CN116316024A - 9-shaped cavity laser with programmable starting mode - Google Patents
9-shaped cavity laser with programmable starting mode 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
- H01S3/10—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
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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
- H01S3/05—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
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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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
- H01S3/10061—Polarization control
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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
- H01S3/10069—Memorized or pre-programmed characteristics, e.g. look-up table [LUT]
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Abstract
The invention discloses a 9-shaped cavity laser with a programmable starting mode, which adopts a 9-shaped cavity mode-locking fiber laser structure. The resonant cavity is internally provided with a wave plate capable of rotating an angle, and the parameter domain of the laser can be scanned by adjusting the angle of the wave plate in the starting process of the laser; meanwhile, the output power of the pumping diode can be adjusted according to a specific time sequence in the starting process, and the output state of the laser is monitored in real time in the starting process. The angle of the wave plate is adjusted in the starting process, and the laser is self-started by matching with the programmed adjustment of the output power of the pump diode, and the adjusting process is stopped when the target mode locking state is reached; finally, the 9-shaped cavity laser with the programmable starting mode is realized. The invention can obviously improve the self-starting performance of the 9-shaped cavity laser, can stably and efficiently enter an ideal mode locking state, and has wide application prospect and great development potential.
Description
Technical Field
The invention relates to an optical fiber mode-locked laser, in particular to a 9-shaped cavity laser with a programmable starting mode, and belongs to the technical field of optical fiber lasers.
Background
Passive mode locking is an effective method of generating ultrashort pulses. The passive mode-locked fiber laser has the advantages of low cost, good stability, small volume and the like, and has recently been paid more attention to the field of ultrafast lasers.
The common techniques for achieving passive mode locking in fiber lasers are mainly three: 1. passive mode locking technology based on a truly saturable absorber; 2. nonlinear polarization rotation techniques; 3. nonlinear magnifying ring mirror technology. The passive mode locking technology based on the true saturable absorber can degrade with time due to the performance of the saturable absorber, and can be damaged due to over-high power in the use process, so that the defects of poor reliability and short service life are often caused. The nonlinear polarization rotation technology is difficult to realize a polarization maintaining structure because the nonlinear polarization rotation technology needs to rely on the evolution process of the polarization state of laser in a cavity to reach the mode locking state, is sensitive to external interference, is easy to lose the mode locking state in the working process, and has poor stability. In contrast, the nonlinear amplifying ring mirror technology can realize a full polarization maintaining structure, and the performance is not easy to degrade with time, so that the nonlinear amplifying ring mirror technology has excellent mode locking stability and system reliability, and meanwhile, the nonlinear amplifying ring mirror technology has inherent low noise characteristics and has great advantages and potential in the passive mode locking technology of the fiber laser.
While nonlinear magnifying ring mirror technology has significant advantages, its difficulty in self-priming is a major bottleneck in the development of this technology. To overcome this problem, a new structure based on the nonlinear amplifying ring mirror technology, a 9-shaped cavity laser, is proposed. The structure introduces phase bias in the cavity by adding the nonreciprocal phase shift device, thereby greatly optimizing the self-starting characteristic of the structure. However, the packaged nonreciprocal phase shift device has a certain phase shift amount, so that the 9-cavity laser often has an undesirable self-starting mode locking state, such as multi-pulse mode locking, and an undesirable spectrum morphology, due to the fact that the phase shift amounts are not matched. While a non-reciprocal phase shift device with an adjustable amount of phase shift typically comprises two or even more wave plates and thus has a huge parameter space. The conventional laser starting mode is to fix or lock the wave plate angle, and only the pump diode is started to realize that the laser enters the mode locking state, but the self-starting working point is difficult to find due to factors such as the drift of an optical mechanical part of the resonant cavity, the ageing of a device and the like, and the problems that the optimization is difficult to realize after the non-ideal mode locking state are solved.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a 9-shaped cavity laser with a programmable starting mode, which is easy to build and can be used for searching a target mode locking state through program control optimization. The 9-shaped cavity laser provided by the invention can realize good self-starting performance and can enter an ideal mode locking state efficiently.
In order to achieve the above object, the technical scheme of the present invention is as follows: a9-shaped cavity laser with a programmable starting mode is characterized in that a wave plate capable of rotating an angle is arranged in the laser, and a parameter domain of the laser can be scanned in a certain range through rotating the wave plate in the starting process of the laser; meanwhile, the output power of the pump diode can be adjusted according to a specific time sequence in the starting process; meanwhile, the laser has a circuit structure capable of judging the output pulse state of the laser in real time (by converting part of output light into an electric signal by coupling the light into a photoelectric detector), the output state of the laser is monitored in real time in the starting process, the laser is self-started by adjusting the angle of a wave plate in the starting process and simultaneously matching with the programmed adjustment of the output power of a pumping diode, and the adjusting process is stopped when the target mode locking state is reached; finally, the 9-shaped cavity laser with the programmable starting mode is realized, and the structure of the 9-shaped cavity laser comprises a 9-shaped cavity oscillator and a circuit structure for judging the output state of the oscillator in real time.
The circuit structure for judging the output state of the oscillator in real time comprises a photoelectric detector and a judging circuit, and the circuit structure is used for detecting the output signal of the 9-shaped cavity oscillator and judging the output state in real time. According to the automatic judging result of the program control, the subsequent adjusting process (comprising adjusting the angle of the wave plate and/or adjusting the output power of the pumping diode) is controlled, so that the laser can reach the ideal mode locking state more efficiently.
The programmable start mode can scan the parameter domain of the laser by adjusting the angle of the wave plate in the start process, and specifically comprises the situation that the rotatable angle of any wave plate is larger than or equal to 30 degrees. By enabling the wave plate to have a wide adjustable angle range, the problems that the ideal mode locking state is difficult to find and the mode locking state is difficult to optimize when the ideal mode locking state is distributed in a parameter domain more dispersedly or the ideal mode locking state is less can be solved; so as to ensure that the laser can stably enter an ideal mode locking state.
The pumping diode is a laser diode, and pumping light enters the 9-shaped cavity oscillator through a pumping end of the wavelength division multiplexer.
The programmable starting mode is specifically a laser starting method which enables a pump diode to keep an output state under an initial set power in a laser starting process, then continuously rotates a wave plate and adjusts a scanning laser parameter domain in cooperation with the programming of the output power of the pump diode, simultaneously judges the laser output state in real time, enables the laser to be self-started, and stops the scanning process after entering a target mode locking state. By using the starting mode, the problems that the 9-shaped cavity laser is difficult to self-start and the mode locking state is difficult to optimize can be well solved, and the 9-shaped cavity laser can stably and efficiently enter an ideal mode locking state in the starting process.
The output power of the pumping diode can be adjusted according to the programming, and particularly comprises the steps of properly adjusting the pumping power when the laser is difficult to start, and promoting the laser to enter a mode locking state; after the laser device is locked, continuing to rotate the wave plate and matching with proper adjustment of pumping power to enable the laser device to enter an ideal mode locking state; and when the mode locking state is optimized, if the laser loses lock, the mode locking state is recovered through adjusting the pumping power, and other various scenes needing the pumping power adjustment are realized. The mode locking state of the 9-shaped cavity laser is optimized in more dimensions by programmatically adjusting the output power of the pump diode in a programmable starting mode; the method has remarkable improvement effect on the speed and effect of searching the ideal mode locking state of the laser.
The wave plate capable of rotating the angle in the starting process comprises a quarter wave plate, a first half wave plate and/or a second half wave plate; the wave plate angle control device comprises electric control and/or mechanical control and other various control modes capable of rotating the wave plate angle. The wave plate capable of rotating the angle in the starting process can adjust the types and the quantity of the wave plates and the relative sequence of the wave plates and the arrangement of other space optical elements according to actual needs. The wave plate comprises all arrangements and combinations which can lock the mode of the 9-shaped cavity oscillator.
The 9-shaped cavity oscillator comprises a reflecting mirror, a polarization beam splitter, a quarter wave plate, a first half wave plate, a first Faraday rotator, a polarization combiner Shu Zhunzhi, a gain optical fiber, a wavelength division multiplexer and a laser diode; the common end of the wavelength division multiplexer is connected with one end of the gain optical fiber, the other end of the gain optical fiber is connected with one end of the polarization beam combining collimator, the signal end of the wavelength division multiplexer is connected with the other end of the polarization beam combining collimator, the pumping end of the wavelength division multiplexer is connected with the laser diode, and the polarization beam combining collimator converts optical fiber light into space light and then sequentially passes through the first Faraday rotator, the first half wave plate, the quarter wave plate, the polarization beam splitting mirror and the reflecting mirror. The reflecting surface of the polarization beam splitter outputs a laser signal.
The wave plate position can be adjusted according to the requirement of the 9-shaped cavity laser structure. The structure includes the case where the wave plate is located on the linear arm, in the fiber optic annular mirror, or both.
The 9-shaped cavity oscillator comprises an optical fiber mirror, an optical fiber coupler, a gain optical fiber, a wavelength division multiplexer, a laser diode, a first collimator, a first Faraday rotator, a first half wave plate, a quarter wave plate, a second half wave plate, a second Faraday rotator and a second collimator, wherein the public end of the wavelength division multiplexer is connected with one end of the gain optical fiber, the other end of the gain optical fiber is connected with the first end of the optical fiber coupler, and the signal end of the wavelength division multiplexer is connected with the second collimator; the pumping end of the wavelength division multiplexer is connected with the laser diode, and the second end of the optical fiber coupler is connected with the first collimator; the third end of the fiber coupler is connected with the fiber mirror. The first Faraday rotator, the first half wave plate, the quarter wave plate, the second half wave plate and the second Faraday rotator are sequentially arranged between the first collimator and the second collimator.
The fourth end of the optical fiber coupler outputs a laser signal, and the output signal is received by the photoelectric detector, converted into an electric signal and then enters the judging circuit.
The working process is as follows: in the starting process of the laser, the laser diode is enabled to maintain an output state under a set power value; the angles of the first half wave plate, the quarter wave plate and the second half wave plate are adjusted, the parameter domain of the laser is scanned within a certain range, the output power of the laser diode is adjusted in a programmed mode, the output state of the laser diode is judged in real time by utilizing a judging circuit, the 9-shaped cavity laser is enabled to be self-started, and the adjusting process is ended after the laser diode enters an ideal mode locking state.
The 9-shaped cavity oscillator comprises a reflecting mirror, a polarization beam splitter, a second half-wave plate, a third collimator, an optical fiber coupler, a gain optical fiber, a wavelength division multiplexer, a laser diode, a first collimator, a first Faraday rotator, a first half-wave plate, a quarter-wave plate, a second Faraday rotator and a second collimator, wherein the public end of the wavelength division multiplexer is connected with one end of the gain optical fiber, the other end of the gain optical fiber is connected with the first end of the optical fiber coupler, and the signal end of the wavelength division multiplexer is connected with the second collimator; the pumping end of the wavelength division multiplexer is connected with the laser diode, and the second end of the optical fiber coupler is connected with the first collimator; the third end of the optical fiber coupler is connected with a third collimator, a first Faraday rotator, a first half-wave plate, a quarter-wave plate and a second Faraday rotator are sequentially arranged between the first collimator and the second collimator, and a second half-wave plate, a polarization beam splitter and a reflecting mirror are sequentially arranged behind the third collimator. The fourth end of the optical fiber coupler outputs a laser signal. The output signal is received by the photoelectric detector, converted into an electric signal and then enters the judging circuit. The working process is as follows: in the starting process of the laser, the laser diode is enabled to maintain an output state under a set power value; the angles of the first half wave plate, the second half wave plate and the quarter wave plate are adjusted, the parameter domain of the laser is scanned within a certain range, the output power of the laser diode is adjusted in a programmed mode, the output state of the laser diode is judged in real time by utilizing a judging circuit, the 9-shaped cavity laser is enabled to be self-started, and the adjustment process is ended after the ideal mode locking state is entered.
The beneficial effects are that: compared with the prior art, the 9-shaped cavity laser with the programmable starting mode has the remarkable advantages that the problem of difficult self-starting possibly occurring in the 9-shaped cavity laser can be well overcome by using the programmable starting mode, and the self-starting performance of the 9-shaped cavity laser is improved. By introducing a real-time judging circuit, a programmed starting mode is used, a laser parameter domain is scanned within a certain range by rotating a wave plate in the starting process, and a target mode locking state is searched by matching with the programmed adjustment of pumping power. Compared with the conventional method for fixing or locking the wave plate angle, the method has the advantages that only the pump diode is started, so that the laser enters a mode-locking starting mode, and the programmable starting mode overcomes the technical shortboard which can generate an undesirable working state and is difficult to optimize. The self-starting performance of the 9-shaped cavity laser is obviously improved, and the 9-shaped cavity laser can be ensured to stably and efficiently enter an ideal mode locking state. The structure design is simple, the volume is compact, the reliability is high, the operation is simple and convenient, and the practicability of the 9-shaped cavity laser is greatly improved.
Drawings
Fig. 1 is a schematic diagram of a 9-cavity laser with programmable start-up mode in which the waveplate is located on the linear arm in embodiment 1.
Fig. 2 is a schematic diagram of a 9-cavity laser with programmable start-up mode in which a waveplate is located in a fiber optic ring mirror in embodiment 2.
Fig. 3 is a schematic diagram of a 9-cavity laser with programmable start-up mode in embodiment 3, in which the waveplate is located on the linear arm and in the optical ring mirror at the same time.
In the figure: 1. the device comprises a polarization beam splitter, 2, a polarization beam splitter, 3, a quarter wave plate, 4, a first half wave plate, 5, a first Faraday rotator, 6, a polarization beam combining collimator, 7, a gain fiber, 8, a wavelength division multiplexer, 9, a laser diode, 10, a photoelectric detector, 11, a judging circuit, 12, a fiber mirror, 13, a fiber coupler, 14, a second half wave plate, 15, a second Faraday rotator, 16, a first collimator, 17, a second collimator and 18, and a third collimator.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings in order to enhance understanding and appreciation of the invention.
The wave plate in the preferred embodiment can adjust the type and the number of the wave plates and the relative positions of the wave plates and other space optical elements according to the actual requirements of the cavity type. All wave plate arrangement and combination modes capable of enabling the 9-shaped cavity laser to enter a mode locking state are included. Example 1: the present embodiment provides a design of a 9-cavity laser with programmable start-up mode with a waveplate on the linear arm. The specific scheme is as follows in combination with the figure one: the laser comprises a reflecting mirror 1, a polarization beam splitter 2, a quarter wave plate 3, a first half wave plate 4, a first Faraday rotator 5, a polarization beam combining collimator 6, a gain optical fiber 7, a wavelength division multiplexer 8, a laser diode 9, a photoelectric detector 10 and a judging circuit 11, and specifically: the common end of the wavelength division multiplexer 8 is connected with one end of the gain optical fiber 7, the other end of the gain optical fiber 7 is connected with one end of the polarization beam combining collimator 6, and the signal end of the wavelength division multiplexer 8 is connected with the other end of the polarization beam combining collimator 6; the pumping end of the wavelength division multiplexer 8 is connected with a laser diode 9, and the polarization beam combination collimator 6 converts the optical fiber light into space light and then sequentially passes through the Faraday rotator 5, the first half wave plate 4, the quarter wave plate 3, the polarization beam splitter 2 and the reflecting mirror 1. The reflecting surface of the polarization beam splitter 2 outputs a laser signal. The output signal is received by the photodetector 10, converted into an electrical signal, and then enters the judgment circuit 11. The working process is as follows: in the starting process of the laser, the laser diode 9 is kept in an output state under a set power value; the angles of the quarter wave plate 3 and the first half wave plate 4 are adjusted, the parameter domain of the laser is scanned within a certain range, the output power of the laser diode 9 is adjusted in a programmed mode, the output state of the laser diode 9 is judged in real time by utilizing the judging circuit 11, the 9-shaped cavity laser is automatically started, and the adjusting process is ended after the ideal mode locking state is entered.
Example 2: the embodiment provides a design scheme of a 9-shaped cavity laser with a programmable starting mode, wherein a wave plate is positioned in an optical fiber annular mirror. The specific scheme shown in fig. 2 is as follows: the laser comprises a fiber mirror 12, a fiber coupler 13, a gain fiber 7, a wavelength division multiplexer 8, a laser diode 9, a first collimator 16, a first Faraday rotator 5, a first half-wave plate 4, a quarter-wave plate 3, a second half-wave plate 14, a second Faraday rotator 15, a second collimator 17, a photoelectric detector 10 and a judging circuit 11. Specific: the public end of the wavelength division multiplexer 8 is connected with one end of the gain optical fiber 7, the other end of the gain optical fiber 7 is connected with the first end of the optical fiber coupler 13, and the signal end of the wavelength division multiplexer 8 is connected with the second collimator 17; the pump end of the wavelength division multiplexer 8 is connected to a laser diode 9. The second end of the fiber coupler 13 is connected with a first collimator 16; the third end of the fiber coupler 13 is connected to the fiber mirror 12. The first faraday rotator 5, the first half-wave plate 4, the quarter-wave plate 3, the second half-wave plate 14 and the second faraday rotator 15 are arranged in order between the first collimator 16 and the second collimator 17. The fourth terminal of the fiber coupler 13 outputs a laser signal. The output signal is received by the photodetector 10, converted into an electrical signal, and then enters the judgment circuit 11. The working process is as follows: in the starting process of the laser, the laser diode 9 is kept in an output state under a set power value; the angles of the first half wave plate 4, the quarter wave plate 3 and the second half wave plate 14 are adjusted, the parameter domain of the laser is scanned within a certain range, the output power of the laser diode 9 is adjusted in a programmed mode, the output state of the laser diode 9 is judged in real time by utilizing the judging circuit 11, the 9-shaped cavity laser is automatically started, and the adjusting process is ended after the ideal mode locking state is entered.
Example 3: referring to fig. 3, the present embodiment provides a design of a 9-cavity laser with programmable start-up mode with a wave plate located on both the linear arm and in the optical ring mirror. Referring to fig. 3, the specific scheme is as follows: the laser comprises a reflecting mirror 1, a polarization beam splitter 2, a second half-wave plate 14, a third collimator 18, an optical fiber coupler 13, a gain optical fiber 7, a wavelength division multiplexer 8, a laser diode 9, a first collimator 16, a first Faraday rotator 5, a first half-wave plate 4, a quarter-wave plate 3, a second Faraday rotator 15, a second collimator 17, a photoelectric detector 10 and a judging circuit 11. Specific: the public end of the wavelength division multiplexer 8 is connected with one end of the gain optical fiber 7, the other end of the gain optical fiber 7 is connected with the first end of the optical fiber coupler 13, and the signal end of the wavelength division multiplexer 8 is connected with the second collimator 17; the pump end of the wavelength division multiplexer 8 is connected to a laser diode 9. The second end of the fiber coupler 13 is connected with a first collimator 16; a third end of the fiber coupler 13 is connected to a third collimator 19. The first faraday rotator 5, the first half-wave plate 4, the quarter-wave plate 3, and the second faraday rotator 15 are arranged in this order between the first collimator 16 and the second collimator 17. The second half-wave plate 14, the polarization beam splitter 2 and the reflecting mirror 1 are arranged in sequence behind the third collimator 18. The fourth terminal of the fiber coupler 13 outputs a laser signal. The output signal is received by the photodetector 10, converted into an electrical signal, and then enters the judgment circuit 11. The working process is as follows: in the starting process of the laser, the laser diode 8 is kept in an output state under a set power value; the angles of the first half wave plate 4, the second half wave plate 14 and the quarter wave plate 3 are adjusted, the parameter domain of the laser is scanned within a certain range, the output power of the laser diode 9 is adjusted in a programmed mode, the output state of the laser diode 9 is judged in real time by utilizing the judging circuit 11, the 9-shaped cavity laser is automatically started, and the adjusting process is ended after the ideal mode locking state is entered.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and equivalent changes or substitutions made on the basis of the above-mentioned technical solutions fall within the scope of the present invention as defined in the claims.
Claims (9)
1. A9-shaped cavity laser with a programmable starting mode is characterized in that a wave plate with a rotation angle is arranged in the laser, and the parameter domain of the laser is scanned by adjusting the angle of the wave plate in the starting process of the laser; meanwhile, the output power of the pump diode is adjusted according to the time sequence in the starting process; meanwhile, the laser has a circuit structure for judging the output pulse state of the laser in real time, the output state of the laser is monitored in real time in the starting process, the laser is automatically started by adjusting the angle of a wave plate in the starting process and simultaneously matching with the programmed adjustment of the output power of the pumping diode, and the adjusting process is stopped when the target mode locking state is reached; finally, the 9-shaped cavity laser with the programmable starting mode is realized, and the structure of the 9-shaped cavity laser comprises a 9-shaped cavity oscillator and a circuit structure for judging the output state of the oscillator in real time.
2. A 9-cavity laser with programmable start-up mode according to claim 1, characterized in that the circuit configuration for real-time determination of the output state of the oscillator comprises a photo detector (10) and a determination circuit (11) for detecting the output signal of the 9-cavity oscillator and for real-time determination of the output state, respectively.
3. A 9-cavity laser with programmable start-up mode according to claim 2, wherein the programmable start-up mode scans the parameter domain of the laser by adjusting the angle of the waveplate during start-up, and specifically includes any waveplate rotatable by 30 ° or more.
4. A 9-cavity laser with programmable start-up mode according to claim 3, characterized in that the pump diode is a laser diode (9) and the pump light enters the 9-cavity oscillator through the pump end of the wavelength division multiplexer (8).
5. The 9-cavity laser with programmable start mode as set forth in claim 4, wherein the programmable start mode is a laser start method that, during the start of the laser, keeps the pump diode in an output state at an initial set power, then continuously rotates the wave plate and adjusts the scanning laser parameter domain in cooperation with the programming of the pump diode output power, and simultaneously determines the laser output state in real time, so that the laser is self-started, and stops the scanning process after entering a target mode locking state.
6. A 9-cavity laser with programmable launch mode according to claim 5, characterized by a wave plate rotated by an angle during launch, comprising a quarter wave plate (3), a first half wave plate (4) and/or a second half wave plate (14); the wave plate angle control device comprises electric control and/or mechanical control.
7. A 9-cavity laser with programmable start-up mode according to claim 6, characterized in that the 9-cavity oscillator comprises a mirror (1), a polarization beam splitter (2), a quarter wave plate (3), a first half wave plate (4), a first faraday rotator (5), a polarization beam combining collimator (6), a gain fiber (7), a wavelength division multiplexer (8) and a laser diode (9); the common end of the wavelength division multiplexer (8) is connected with one end of the gain optical fiber (7), the other end of the gain optical fiber (7) is connected with one end of the polarization beam combining collimator (6), the signal end of the wavelength division multiplexer (8) is connected with the other end of the polarization beam combining collimator (6), the pumping end of the wavelength division multiplexer (8) is connected with the laser diode (9), and the polarization beam combining collimator (6) converts optical fiber light into space light and sequentially passes through the first Faraday rotator (5), the first half wave plate (4), the quarter wave plate (3), the polarization beam splitting mirror (2) and the reflecting mirror (1).
8. A 9-cavity laser with programmable start-up mode according to claim 6, characterized in that the 9-cavity oscillator comprises a fiber mirror (12), a fiber coupler (13), a gain fiber (7), a wavelength division multiplexer (8), a laser diode (9), a first collimator (16), a first faraday rotator (5), a first half-wave plate (4), a quarter-wave plate (3), a second half-wave plate (14), a second faraday rotator (15) and a second collimator (17), the common end of the wavelength division multiplexer (8) is connected to one end of the gain fiber (7), the other end of the gain fiber (7) is connected to the first end of the fiber coupler (13), and the signal end of the wavelength division multiplexer (8) is connected to the second collimator (17); the pumping end of the wavelength division multiplexer (8) is connected with the laser diode (9), and the second end of the optical fiber coupler (13) is connected with the first collimator (16); the third end of the optical fiber coupler (13) is connected with the optical fiber mirror (12), and a first Faraday rotator (5), a first half-wave plate (4), a quarter-wave plate (3), a second half-wave plate (14) and a second Faraday rotator (15) are sequentially arranged between the first collimator (16) and the second collimator (17).
9. A 9-cavity laser with programmable start-up mode according to claim 6, characterized in that the 9-cavity oscillator comprises a mirror (1), a polarization beam splitter (2), a second half-wave plate (14), a third collimator (18), a fiber coupler (13), a gain fiber (7), a wavelength division multiplexer (8), a laser diode (9), a first collimator (16), a first faraday rotator (5), a first half-wave plate (4), a quarter-wave plate (3), a second faraday rotator (15) and a second collimator (17), wherein the common end of the wavelength division multiplexer (8) is connected to one end of the gain fiber (7), the other end of the gain fiber (7) is connected to the first end of the fiber coupler (13), and the signal end of the wavelength division multiplexer (8) is connected to the collimator (2 (17); the pumping end of the wavelength division multiplexer (8) is connected with the laser diode (9), and the second end of the optical fiber coupler (13) is connected with the first collimator (16); the third end of the optical fiber coupler (13) is connected with a third collimator (18), a first Faraday rotator (5), a first half-wave plate (4), a quarter-wave plate (3) and a second Faraday rotator (15) are sequentially arranged between the first collimator (16) and the second collimator (17), and a second half-wave plate (14), a polarization beam splitter (2) and a reflecting mirror (1) are sequentially arranged behind the third collimator (18).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117578173A (en) * | 2023-10-27 | 2024-02-20 | 北京大学长三角光电科学研究院 | Full polarization-maintaining O-shaped ultrashort pulse mode-locked fiber laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117578173A (en) * | 2023-10-27 | 2024-02-20 | 北京大学长三角光电科学研究院 | Full polarization-maintaining O-shaped ultrashort pulse mode-locked fiber laser |
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