Annular resonant cavity pulse laser based on waveform modulation

Abstract

The invention provides an annular resonant cavity pulse laser based on waveform modulation, and relates to the technical field of lasers, the annular resonant cavity pulse laser comprises a pumping gain module, an adjustable coupler, an acousto-optic modulator and a fiber bragg grating, the pumping gain module is connected with the first end and the second end of the adjustable coupler, and the acousto-optic modulator is connected with the fiber bragg grating. The adjustable coupler adjusts the pumping threshold power by changing the splitting ratio; the fiber bragg grating is connected with the third end of the adjustable coupler, the fiber bragg grating, the adjustable coupler and the pumping gain module form an annular resonant cavity, and the annular resonant cavity is used for laser oscillation and outputting continuous seed light to the acousto-optic modulator; the acousto-optic modulator is connected with the fourth end of the adjustable coupler, and the acousto-optic modulator is used for carrying out waveform modulation on the continuous seed light. According to the invention, the energy utilization efficiency and the pulse stability of the annular resonant cavity pulse laser can be improved.

Description

Technical Field

[0001] The invention relates to the field of laser technology, and in particular to a ring resonator pulse laser based on waveform modulation. Background Art

[0002] Pulse fiber lasers have attracted widespread attention due to their advantages such as good beam quality, compact structure, high conversion efficiency, good stability, easy maintenance, and good heat dissipation performance. At present, pulse fiber lasers have been widely used in many fields such as optical fiber communication, laser material processing, and military defense. Compared with the continuous seed light source generated by the traditional FP resonant cavity, the ring resonator uses an acousto-optic modulator to cut the continuous seed source of the ring resonator to generate pulsed lasers. Not only does it have a large repetition frequency adjustment range, but it is also more flexible and convenient to adjust the pulse waveform and width.

[0003] The Chinese patent application with the announcement number CN117175333A discloses a hybrid cavity single-frequency multi-frequency adjustable fiber laser and a photogenerated microwave source. The hybrid cavity fiber laser is composed of a linear fiber resonator with gain and a ring-shaped whispering gallery mode resonator. In the linear fiber cavity, one end of the gain fiber is connected to a fiber reflector, and the other end is a bevel fiber adjustable coupler. The laser produces total reflection at the end face of the bevel fiber, and the light wave enters the whispering gallery mode resonator through evanescent wave coupling. By means of the extremely high quality factor and Rayleigh scattering feedback of the whispering gallery mode ring resonator, a narrow-band feedback device is formed, which forms a hybrid cavity with the linear fiber cavity where the gain fiber is located, thereby reducing the laser threshold. After the pump laser reaches the threshold, the fiber cavity generates a continuous narrow linewidth single-frequency laser signal. After the laser signal reaches the nonlinear effect threshold of the whispering gallery cavity in the whispering gallery mode resonator, a nonlinear frequency conversion is generated, thereby generating a multi-frequency laser. Therefore, it is very necessary to provide a ring resonator pulse laser based on waveform modulation to improve the laser output power and beam quality. Summary of the invention

[0004] In view of this, the present invention proposes a waveform-modulated ring resonator pulse laser. By using a pump gain module to provide energy and forming a double-ended connection with an adjustable coupler, the stability of optical transmission and signal loss are improved. At the same time, the adjustable coupler optimizes the pump threshold power by flexibly adjusting the splitting ratio, thereby improving energy utilization efficiency and pulse stability.

[0005] The present invention provides a waveform-modulated ring resonator pulse laser, comprising a pump gain module, an adjustable coupler, an acousto-optic modulator and a fiber grating, wherein The pump gain module is connected to the first end and the second end of the adjustable coupler respectively, and the adjustable coupler can adjust the pump threshold power by changing the splitting ratio; The fiber Bragg grating is connected to the third end of the adjustable coupler, and the fiber Bragg grating, the adjustable coupler and the pump gain module constitute a ring resonant cavity, which is used for laser oscillation and outputs continuous seed light to the acousto-optic modulator; The acousto-optic modulator is connected to the fourth end of the adjustable coupler, and is used to perform waveform modulation on the continuous seed light to output pulsed laser.

[0006] On the basis of the above technical solution, preferably, the expression of the pump threshold power is:

[0007]

[0008] in, α represents the total loss in the ring resonator, k 1 indicates device loss, k 2 represents the coupling output loss, P represents the pump threshold power, hv p represents the photon energy of the pump source, A represents the beam area of ​​the output pulse laser, η p represents the pump efficiency, τ2 represents the upper level lifetime, σ em Indicates the size of the pulse laser emission cross section.

[0009] On the basis of the above technical solution, preferably, the pump gain module includes a first pump source, a first fiber combiner and a gain fiber, the first pump source is connected to the first end of the first fiber combiner, the second end of the first fiber combiner is connected to one end of the gain fiber, the third end of the first fiber combiner is connected to the first end of the adjustable coupler, and the other end of the gain fiber is connected to the second end of the adjustable coupler.

[0010] More preferably, the splitting ratio of the adjustable coupler is any one of 90:10, 80:20 and 50:50.

[0011] More preferably, the gain fiber includes any one of ytterbium-doped fiber, erbium-doped fiber, erbium-ytterbium co-doped fiber and thulium-doped fiber.

[0012] More preferably, the fiber Bragg grating includes a high-reflection Bragg fiber grating or a reflective coated fiber grating.

[0013] More preferably, the fiber Bragg grating is connected to the fourth end of the adjustable coupler, and the acousto-optic modulator is connected to the third end of the adjustable coupler.

[0014] More preferably, the pump gain module also includes a second fiber combiner and a second pump source, the second pump source is connected to the first end of the second fiber combiner, the second end of the second fiber combiner is connected to the other end of the gain fiber, and the second end of the second fiber combiner is connected to the second end of the adjustable coupler.

[0015] More preferably, the pumping modes of the first pump source and the second pump source include any one of forward pumping, reverse pumping and bidirectional pumping, and the first pump source and the second pump source include any one of semiconductor lasers, solid-state lasers and fiber lasers.

[0016] More preferably, the first optical fiber combiner and the second optical fiber combiner are both forward combiners or reverse combiners.

[0017] The waveform-modulated ring resonator pulse laser provided by the present invention has the following beneficial effects compared with the prior art: (1) By using a pump gain module to provide energy and forming a two-end connection with an adjustable coupler, the stability of optical path transmission and signal loss are improved. At the same time, the adjustable coupler can optimize the pump threshold power by flexibly adjusting the splitting ratio, and can accurately control the pump light power entering the ring resonator, thereby optimizing the working state of the laser and improving energy utilization efficiency and pulse stability. The connection between the fiber Bragg grating and the third end of the adjustable coupler forms a ring resonator structure, ensuring the stable oscillation of the laser in the cavity. At the same time, with the help of the wavelength selection effect of the fiber Bragg grating and the waveform modulation function of the acousto-optic modulator, a pulse laser output with high wavelength purity and controllable waveform can be obtained, thereby ensuring the stable and reliable operation of the ring resonator pulse laser while also having good adjustability and adaptability.

[0018] (2) Through the specific reflection bandwidth characteristics of the fiber Bragg grating and the unique structure of the ring resonator, the continuous oscillation and amplification process of the laser is realized, so that the continuous seed light forms a stable cyclic transmission path in the ring cavity. When the laser passes through the gain fiber, the inversion particle number is consumed and amplified, and then it is reflected back to the ring cavity through the fiber Bragg grating to continue the cyclic amplification. This closed-loop design not only effectively solves the problem of continuous light instability and the generation of chaotic small pulses in the traditional FP resonator, but also significantly improves the output stability and overall performance of the laser through stable energy replenishment and cyclic amplification mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a ring resonator pulse laser provided in the first embodiment of the present invention; Figure 2 A schematic diagram of the structure of a ring resonator pulse laser provided in the second embodiment of the present invention; Figure 3 A schematic structural diagram of a ring resonator pulse laser provided in the third embodiment of the present invention.

[0021] Explanation of the reference numerals: 1. Ring resonator; 11. First pump source; 12. First fiber combiner; 13. Gain fiber; 14. Second fiber combiner; 15. Second pump source; 2. Adjustable coupler; 3. Fiber Bragg grating; 4. Acousto-optic modulator. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] refer to Figure 1 The present invention provides a waveform-modulated ring resonator pulse laser, comprising a pump gain module, an adjustable coupler 2, an acousto-optic modulator 4 and a fiber grating 3, wherein: The pump gain module is connected to the first end and the second end of the adjustable coupler 2 respectively, and the adjustable coupler 2 adjusts the pump threshold power by changing the splitting ratio. The pump gain module includes a first pump source 11, a first fiber combiner 12 and a gain fiber 13, the first pump source 11 is connected to the first end of the first fiber combiner 12, the second end of the first fiber combiner 12 is connected to one end of the gain fiber 13, the third end of the first fiber combiner 12 is connected to the first end of the adjustable coupler 2, and the other end of the gain fiber 13 is connected to the second end of the adjustable coupler 2.

[0024] In this embodiment, by optimizing the combination and connection of the first pump source 11, the first fiber combiner 12 and the gain fiber 13 of the pump gain module, efficient energy transmission from the pump light source to the gain medium is achieved, and the flexible adjustment of the pump threshold power by the adjustable coupler 2 not only improves the utilization efficiency of the pump light, but also enables the working state of the laser to be accurately adjusted according to actual needs. At the same time, this modular structural design also simplifies the assembly and adjustment process of the ring resonator pulse laser, and improves the stability and reliability of the ring resonator pulse laser.

[0025] Furthermore, the gain fiber 13 includes any one of ytterbium-doped fiber, erbium-doped fiber, erbium-ytterbium co-doped fiber and thulium-doped fiber, the pumping mode of the first pump source 11 includes any one of forward pumping, reverse pumping and bidirectional pumping, the first pump source 11 and the second pump source 15 include any one of a semiconductor laser, a solid laser and a fiber laser, and the first fiber combiner 12 is a forward combiner or a reverse combiner.

[0026] By providing a variety of component options, the high flexibility and wide applicability of the ring resonator pulse laser are achieved. In terms of gain fiber 13, ytterbium-doped fiber suitable for the 1μm band with high efficiency and high gain characteristics, erbium-doped fiber suitable for the 1.5μm band and widely used in the field of optical communications, erbium-ytterbium co-doped fiber that can achieve wide gain bandwidth, and thulium-doped fiber suitable for the 2μm band with unique advantages in the field of medical sensing can be selected; in terms of pumping mode, forward pumping with simple structure, reverse pumping that is conducive to heat management, or bidirectional pumping that achieves uniform pump distribution can be selected according to power requirements; in terms of pump source selection, semiconductor lasers with small size and high efficiency, solid lasers with stable output, or fiber lasers with good beam quality can be used; at the same time, in the selection of fiber combiners, forward combiners with simple structure and low loss or reverse combiners suitable for high-power applications can be selected according to the application scenario.

[0027] In this embodiment, the pump threshold power is expressed as:

[0028]

[0029] in, α represents the total loss in the ring resonator, k 1 indicates device loss, k 2 represents the coupling output loss, P represents the pump threshold power, hv p represents the photon energy of the pump source, A represents the beam area of ​​the output pulse laser, ηp represents the pump efficiency, τ2 represents the upper level lifetime, σ em Indicates the size of the pulse laser emission cross section.

[0030] In this embodiment, the loss level in the resonant cavity can be effectively controlled by adjusting the splitting ratio of the adjustable coupler. When a lower splitting ratio is selected, the intracavity loss can be significantly reduced, thereby achieving a lower pump threshold power. This loss control mechanism based on splitting ratio adjustment can optimize the working state of the laser according to actual application requirements, effectively improving the energy utilization efficiency and operation stability of the ring resonator pulse laser.

[0031] The splitting ratio of the adjustable coupler 2 is any one of 90:10, 80:20 and 50:50, which realizes the flexible adjustment of the laser performance. When the length of the resonant cavity is fixed, a higher return ratio in the cavity (such as 90:10) means that more light is returned in a single-pass transmission, which accelerates the growth rate of energy in the resonant cavity, so that the ring resonant cavity pulse laser only needs to absorb less energy to resonate, thereby reducing the pump threshold power; conversely, a lower return ratio will increase the pump threshold power. This adjustability enables the laser to flexibly adjust the operating parameters according to actual application requirements, improving the applicability and practical value of the laser.

[0032] The fiber Bragg grating 3 is connected to the third end of the adjustable coupler 2. The fiber Bragg grating 3, the adjustable coupler 2 and the pump gain module constitute a ring resonator 1. The ring resonator 1 is used for laser oscillation and outputs continuous seed light to the acousto-optic modulator 4. The fiber Bragg grating 3 includes a high-reflection Bragg fiber Bragg grating 3 or a reflective coated fiber Bragg grating 3.

[0033] Compared with the continuous seed light source generated by the traditional FP resonant cavity, the ring resonator 1 uses the acousto-optic modulator 4 to cut the continuous seed source of the ring resonator 1 to generate pulsed laser, which not only has a large repetition frequency adjustment range, but also makes the pulse waveform and width adjustment more flexible and convenient. This waveform-modulated ring resonator 1 pulse laser can also be used as a seed source for MOPA fiber lasers, which can achieve high peak power and reduce the stimulated Raman scattering effect.

[0034] In this embodiment, the continuous oscillation and amplification process of the laser is realized through the specific reflection bandwidth characteristics of the fiber Bragg grating 3 and the unique structure of the ring resonator 1, so that the continuous seed light forms a stable cyclic transmission path in the ring cavity. When the laser passes through the gain fiber 13, the inversion particle number is consumed and amplified, and then it is reflected back to the ring cavity through the fiber Bragg grating 3 to continue the cyclic amplification. This closed-loop design not only effectively solves the problem of continuous light instability and generation of chaotic small pulses in the traditional FP resonator, but also significantly improves the output stability and overall performance of the laser through stable energy replenishment and cyclic amplification mechanism, providing a reliable technical guarantee for achieving high-quality pulsed laser output.

[0035] The acousto-optic modulator 4 is connected to the fourth end of the adjustable coupler 2, and the acousto-optic modulator 4 is used to perform waveform modulation on the continuous seed light to output a pulsed laser. Moreover, the acousto-optic modulator 4 is not in the ring resonator 1, but is connected to one end of the coupler of the ring resonator. The acousto-optic modulator 4 can be connected to any end of the coupler as needed. The pulsed laser output by the acousto-optic modulator 4 can be directly output as a laser, or can be used as a signal light of a MOPA laser for optical amplification. The acousto-optic modulator 4 adopts a design of being connected to the outside of the ring resonator 1, and the connection port with the coupler can be flexibly selected. This structure does not affect the stable operation of the ring resonator 1, and can effectively perform waveform modulation on the continuous seed light. At the same time, the pulsed laser output by the acousto-optic modulator 4 has a dual application mode. This design not only improves the flexibility and adjustability of the ring resonator pulse laser, but also expands the application range of the laser, especially in situations where high-power output is required, higher output power can be obtained through MOPA amplification.

[0036] The first pump source 11 generates a continuous seed laser to provide energy for the laser gain medium (doped fiber). When the seed laser is transmitted from the fiber combiner to the doped fiber cladding, it passes through the gain medium of the fiber core multiple times through the total reflection characteristics of the fiber and is absorbed, forming a population inversion. The seed laser oscillates in the ring resonator 1. A portion of the laser enters the fiber grating 3 through the third end of the adjustable coupler 2 for reflection. The seed laser reflected back by the fiber grating 3 returns to the ring cavity through the third end of the coupler again, and consumes the inverted population after passing through the gain fiber 13, thereby amplifying the seed laser. This cycle is repeated until a stable continuous seed light is output. When the stable continuous seed light is output, the third end of the coupler passes through the fiber grating 3 and returns to the ring cavity to maintain the stability of the ring resonator 1. The fourth end of the coupler outputs a continuous seed light, turns on the switch of the acousto-optic modulator 4, and is chopped by the acousto-optic modulator to obtain laser pulses with different waveforms, frequencies, and pulse widths.

[0037] See also Figure 2 , Figure 2This is a schematic diagram of the structure of the ring resonator pulse laser provided in the second embodiment of the present application. The structure of the ring resonator pulse laser provided in the second embodiment is basically the same as that of the ring resonator pulse laser in the first embodiment, except that, in this embodiment, the fiber grating 3 is connected to the fourth end of the adjustable coupler 2, and the acousto-optic modulator 4 is connected to the third end of the adjustable coupler 2. That is, the acousto-optic modulator 4 is not in the ring resonator 1, but is connected to one end of the coupler of the ring resonator, wherein the acousto-optic modulator 4 can be connected to any end of the coupler as needed.

[0038] By allowing the fiber Bragg grating 3 and the acousto-optic modulator 4 to flexibly switch between the coupler output ports, the optimal connection method can be selected according to the actual application requirements. This flexible port configuration not only improves the adaptability and adjustability of the ring resonator pulse laser, but also ensures the stable operation of the ring resonator 1, so that the ring resonator pulse laser can obtain stable continuous seed light output and ideal pulse modulation effect under different working conditions.

[0039] See also Figure 3 , Figure 3 This is a schematic diagram of the structure of the ring resonator pulse laser provided in the third embodiment of the present application. The structure of the ring resonator pulse laser provided in the third embodiment is basically the same as that of the ring resonator pulse laser in the first embodiment, except that, in this embodiment, the pump gain module also includes a second fiber combiner 14 and a second pump source 15. The second pump source 15 is connected to the first end of the second fiber combiner 14, the second end of the second fiber combiner 14 is connected to the other end of the gain fiber 13, and the second end of the second fiber combiner 14 is connected to the second end of the adjustable coupler 2. By adding the second fiber combiner 14 and the second pump source 15, a double-end pumping structural design is formed, and the two pump sources provide pumping energy from the two ends of the gain fiber 13 respectively, and the pumping light is coupled into the gain fiber 13 through the fiber combiner. This double-ended pumping design not only improves the pumping efficiency and energy utilization, but also enables the gain fiber 13 to obtain a more uniform pumping distribution, thereby improving the output power and conversion efficiency of the laser. At the same time, through the optimized pumping structure, the ring resonator pulse laser can achieve a more stable population inversion distribution, effectively improving the performance indicators of the ring resonator pulse laser.

[0040] Furthermore, the pumping modes of the first pump source 11 and the second pump source 15 include any one of forward pumping, reverse pumping and bidirectional pumping, the first pump source 11 and the second pump source 15 include any one of semiconductor lasers, solid-state lasers and fiber lasers, and the first fiber combiner 12 and the second fiber combiner 14 are both forward combiners or reverse combiners.

[0041] In this embodiment, the first and second pump sources 15 can flexibly select semiconductor lasers, solid-state lasers or fiber lasers, and support forward, reverse or bidirectional pumping modes, and can be used in conjunction with the selection of forward or reverse fiber combiners. This highly flexible configuration scheme can not only select the optimal pumping mode and light source type according to actual application requirements, but also optimize the pumping efficiency according to different working conditions and improve energy utilization. At the same time, by reasonably selecting the combination of pump source type and pumping mode, a more uniform particle number inversion distribution can be achieved, thereby improving the output performance and stability of the laser, and providing the most optimized technical solutions for different application scenarios.

[0042] By adopting a pump gain module to provide energy and forming a double-end connection with the adjustable coupler 2, the stability of optical path transmission and signal loss are improved. At the same time, the adjustable coupler 2 can optimize the pump threshold power by flexibly adjusting the splitting ratio, and can accurately control the pump light power entering the ring resonator 1, so as to optimize the working state of the laser, improve energy utilization efficiency and pulse stability. The connection between the fiber grating 3 and the third end of the adjustable coupler 2 forms a ring resonator 1 structure, ensuring the stable oscillation of the laser in the cavity. At the same time, with the help of the wavelength selection effect of the fiber grating 3 and the waveform modulation function of the acousto-optic modulator 4, a pulse laser output with high wavelength purity and controllable waveform can be obtained, thereby ensuring the stable and reliable operation of the ring resonator pulse laser while also having good adjustability and adaptability.

[0043] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate quantity restrictions, but indicate the existence of at least one. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A ring resonator pulse laser based on waveform modulation, characterized in that: It comprises a pump gain module, an adjustable coupler (2), an acousto-optic modulator (4) and a fiber grating (3), wherein The pump gain module is respectively connected to the first end and the second end of the adjustable coupler (2), and the adjustable coupler (2) adjusts the pump threshold power by changing the splitting ratio; The fiber Bragg grating (3) is connected to the third end of the adjustable coupler (2); the fiber Bragg grating (3), the adjustable coupler (2) and the pump gain module form a ring resonant cavity (1); the ring resonant cavity (1) is used for laser oscillation and outputs continuous seed light to the acousto-optic modulator (4); The acousto-optic modulator (4) is connected to the fourth end of the adjustable coupler (2), and the acousto-optic modulator (4) is used to perform waveform modulation on the continuous seed light to output pulsed laser light.

2. The ring resonator pulse laser according to claim 1, characterized in that: The expression of the pump threshold power is: ； ； in, α represents the total loss in the ring resonator, k 1 indicates device loss, k 2 represents the coupling output loss, P represents the pump threshold power, hv p represents the photon energy of the pump source, A represents the beam area of ​​the output pulse laser, η p represents the pump efficiency, τ2 represents the upper level lifetime, σ em Indicates the size of the pulse laser emission cross section.

3. The ring resonator pulse laser according to claim 2, characterized in that: The pump gain module comprises a first pump source (11), a first optical fiber combiner (12) and a gain optical fiber (13); the first pump source (11) is connected to a first end of the first optical fiber combiner (12); the second end of the first optical fiber combiner (12) is connected to one end of the gain optical fiber (13); the third end of the first optical fiber combiner (12) is connected to a first end of the adjustable coupler (2); and the other end of the gain optical fiber (13) is connected to a second end of the adjustable coupler (2).

4. The ring resonator pulse laser according to claim 3, characterized in that: The splitting ratio of the adjustable coupler (2) is any one of 90:10, 80:20 and 50:

50.

5. The ring resonator pulse laser according to claim 4, characterized in that: The gain optical fiber (13) comprises any one of ytterbium-doped optical fiber, erbium-doped optical fiber, erbium-ytterbium co-doped optical fiber and thulium-doped optical fiber.

6. The ring resonator pulse laser according to claim 5, characterized in that: The optical fiber grating (3) comprises a high-reflection Bragg optical fiber grating (3) or a reflective coated optical fiber grating (3).

7. The ring resonator pulse laser according to claim 6, characterized in that: The optical fiber grating (3) is connected to the fourth end of the adjustable coupler (2), and the acousto-optic modulator (4) is connected to the third end of the adjustable coupler (2).

8. The ring resonator pulse laser according to claim 7, characterized in that: The pump gain module further comprises a second optical fiber combiner (14) and a second pump source (15), wherein the second pump source (15) is connected to a first end of the second optical fiber combiner (14), the second end of the second optical fiber combiner (14) is connected to the other end of the gain optical fiber (13), and the second end of the second optical fiber combiner (14) is connected to a second end of the adjustable coupler (2).

9. The ring resonator pulse laser according to claim 8, characterized in that: The pumping modes of the first pump source (11) and the second pump source (15) include any one of forward pumping, reverse pumping and bidirectional pumping, and the first pump source (11) and the second pump source (15) include any one of semiconductor lasers, solid-state lasers and fiber lasers.

10. The ring resonator pulse laser according to claim 9, characterized in that: The first optical fiber combiner (12) and the second optical fiber combiner (14) are both forward combiners or reverse combiners.

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