CN212342994U - Amplified ring mirror pulse oscillator with switchable output parameters - Google Patents
Amplified ring mirror pulse oscillator with switchable output parameters Download PDFInfo
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- CN212342994U CN212342994U CN202021745307.1U CN202021745307U CN212342994U CN 212342994 U CN212342994 U CN 212342994U CN 202021745307 U CN202021745307 U CN 202021745307U CN 212342994 U CN212342994 U CN 212342994U
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Abstract
The utility model discloses a changeable enlarged ring mirror pulse oscillator of output parameter, it includes that Sagnac interferes ring, central coupler, first linear reflection arm and second linear reflection arm, and wherein, Sagnac interferes ring and central coupler and first linear reflection arm and/or second linear reflection arm constitution nonlinear amplification ring mirror pulse oscillator, the ultrashort pulse of stable output picosecond or femtosecond magnitude. The utility model discloses well Sagnac interferes ring, central coupler and one of them arbitrary linear reflection arm and all can constitute the nonlinear amplification ring mirror pulse oscillator of "9" word chamber type, the ultrashort pulse of stable output picosecond magnitude. The switching of output parameters depends on the switching and the adjustment of the mode locking states of the two lasers between the two linear reflecting arms, and mode locking pulses with different central wavelengths, pulse widths, repetition frequencies and dual wavelengths can be realized.
Description
Technical Field
The utility model relates to a laser technical field specifically indicates a changeable enlarged ring mirror pulse oscillator of output parameter.
Background
Ultrashort pulse fiber lasers play an increasingly important role in the fields of fine processing, laser medical treatment, scientific research, military, national defense and the like, and are becoming key instruments and equipment for promoting the preparation of new materials and new devices. In the implementation of the high-power ultrashort pulse fiber laser, the pulse oscillator is a core component, and the difference of the output parameters of the oscillator directly affects the difference of the final output parameters of the laser, thereby causing the difference of the action field and the application effect of the laser.
The parameters influencing the action field and the application effect of the laser are mainly the output pulse width, the repetition frequency and the output wavelength of the laser. For a high-power ultrashort pulse laser with a fixed index, the laser is limited by a single oscillator output parameter, and the application field and the action effect of the laser are generally limited. High-power fiber femtosecond lasers with pulse width of 20ps, for example, are remarkably effective in the aspect of sapphire wafer (LED) stealth. However, 20ps lasers are not capable of power in undercutting other materials (e.g., SiC wafers). Increasing or decreasing the output pulse width of the laser can only make it competent for SiC wafer stealth, but can result in its inability to competent for LED stealth.
Therefore, the research on the ultrashort pulse fiber oscillator with switchable output parameters can greatly improve the application compatibility of the fiber laser, so that the fiber laser can be suitable for laser processing and manufacturing of different materials. Related researches have been carried out at home and abroad to obtain the optical fiber pulse oscillator with different output parameters, but the change of the output parameters of the laser is small, so that the requirements of different applications are difficult to meet. For example, in 2012, yanble dual-wavelength passing mode-locked Yb-doped fiber laser using SESAM (Tunable dual-wavelength passing mode-locked Yb-doped fiber laser) of tianjin university adopts a semiconductor saturable absorber mirror to realize a dual-wavelength ytterbium-doped fiber laser with Tunable output wavelength. The output center wavelength tuning range of the laser is 1020-1055 nm, and the repetition frequency difference is only 20 kHz. The pulse width comparison of two mode locking pulses is not given in the experiment, but the spectral widths of the two mode locking pulses have little difference, the corresponding conversion limit pulse width difference is presumed to be small, and the change of the output parameter is extremely small.
Disclosure of Invention
The utility model aims at providing a changeable enlarged ring mirror pulse oscillator of output parameter, the utility model discloses a nonlinear enlarged ring mirror realizes that output parameter is changeable.
To achieve the object, the present invention provides an amplifying ring mirror pulse oscillator with switchable output parameters, which is characterized in that: the pulse oscillator comprises a Sagnac interference ring, a central coupler, a first linear reflection arm and a second linear reflection arm, wherein the Sagnac interference ring, the central coupler and the first linear reflection arm and/or the second linear reflection arm form a nonlinear amplification ring mirror pulse oscillator, and ultrashort pulses of picoseconds and even femtoseconds are stably output.
The utility model has the advantages that:
the utility model discloses well Sagnac interferes ring, central coupler and one of them arbitrary linear reflection arm and all can constitute the nonlinear amplification ring mirror pulse oscillator of "9" word chamber type, the ultrashort pulse of stable output picosecond magnitude. The switching of output parameters depends on the switching and the adjustment of the mode locking states of the two lasers between the two linear reflecting arms, and mode locking pulses with different central wavelengths, pulse widths, repetition frequencies and dual wavelengths can be realized.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a schematic diagram of a first optical fiber amplifier according to the present invention;
FIG. 3 is a schematic diagram of a second fiber amplifier according to the present invention;
FIG. 4 is a schematic diagram of a third optical fiber amplifier according to the present invention;
1110-a first fiber amplifier, 1120-a beam splitter, 1130-a phase shifter, 1140-a central coupler, 1150-a second fiber amplifier, 1160-a first filter reflector, 1170-a third fiber amplifier, 1180-a second filter reflector, 1111-a first pump source, 1112-a first wavelength division multiplexer, 1113-a first gain fiber, 1151-a second pump source, 1152-a second wavelength division multiplexer, 1153-a second gain fiber, 1171-a third pump source, 1172-a third wavelength division multiplexer, 1173-a third gain fiber.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
the utility model discloses a changeable amplification ring mirror pulse oscillator of output parameter, as shown in fig. 1 ~ 4, it includes that Sagnac interferes ring, central coupler 1140, first linear reflection arm and second linear reflection arm, and wherein, Sagnac interferes ring and central coupler 1140 and first linear reflection arm and/or second linear reflection arm constitution nonlinear amplification ring mirror pulse oscillator, the ultrashort pulse of stable output picosecond or even femto second magnitude.
In the above solution, the Sagnac interferometric loop includes a first fiber amplifier 1110, a beam splitter 1120, and a phase shifter 1130, the first fiber amplifier 1110 includes a first pump source 1111, a first wavelength division multiplexer 1112, and a first gain fiber 1113, the signal output end of the first pump source 1111 is connected to the first communication end on the left side of the first wavelength division multiplexer 1112, the second communication end on the left side of the first wavelength division multiplexer 1112 is connected to the first communication end of the beam splitter 1120, the communication end on the right side of the first wavelength division multiplexer 1112 is connected to one end of the first gain fiber 1113, the other end of the first gain fiber 1113 is connected to the first communication end on the left side of the central coupler 1140, the second communication end of the beam splitter 1120 is an oscillator mode-locked pulse output end, the third communication end of the beam splitter 1120 is connected to the first communication end of the phase shifter 1130, and the second communication end of the phase shifter 1130 is connected to the second communication end on the left side of the central coupler 1140.
In the above technical solution, the first linear reflection arm includes a second optical fiber amplifier 1150 and a first filter reflector 1160, the second optical fiber amplifier 1150 includes a second pump source 1151, a second wavelength division multiplexer 1152 and a second gain optical fiber 1153, a signal output end of the second pump source 1151 is connected to a left first communication end of the second wavelength division multiplexer 1152, a left second communication end of the second wavelength division multiplexer 1152 is connected to a right first communication end of the central coupler 1140, a right communication end of the second wavelength division multiplexer 1152 is connected to one end of the second gain optical fiber 1153, and the other end of the second gain optical fiber 1153 is connected to a communication end of the first filter reflector 1160.
In the above technical solution, the second linear reflection arm includes a third fiber amplifier 1170 and a second filter reflector 1180, the third fiber amplifier 1170 includes a third pump source 1171, a third wavelength division multiplexer 1172 and a third gain fiber 1173, a signal output end of the third pump source 1171 is connected to a left first communication end of the third wavelength division multiplexer 1172, a left second communication end of the third wavelength division multiplexer 1172 is connected to a right second communication end of the central coupler 1140, a right communication end of the third wavelength division multiplexer 1172 is connected to one end of the third gain fiber 1173, and the other end of the third gain fiber 1173 is connected to a communication end of the second filter reflector 1180.
In the above technical solution, the pump source provides pump energy for the amplifier. The wavelength division multiplexer is used for combining the pumping laser output by the pumping source and the signal beam and then efficiently coupling the combined beam into the gain optical fiber.
In the above technical solution, the doped ion types of the first gain fiber 1113, the second gain fiber 1153, and the third gain fiber 1173 include erbium, ytterbium, thulium, holmium, and neodymium ions. The gain fiber can radiate spontaneous emission laser after being excited by the pump light.
In the technical scheme, the optical fiber amplifiers are inserted into the Sagnac interference ring and the two linear reflection arms to adjust the gain effect of the path, the gain effect depends on the intensity of the pump light, and the stronger the pump light is, the more obvious the gain effect is.
In the above technical solution, the first filter reflector 1160 is a first fiber bragg grating, one end of the first fiber bragg grating is connected to the other end of the second gain fiber 1153, and the other end of the first fiber bragg grating is empty;
or, the first filtering reflector 1160 is composed of a first filter and a first reflector, wherein the other end of the second gain fiber 1153 is connected to the first reflector through the first filter.
The second filter reflector 1180 is a second fiber bragg grating, one end of the second fiber bragg grating is connected to the other end of the third gain fiber 1173, and the other end of the second fiber bragg grating is empty;
alternatively, the second filtering reflector 1180 is composed of a second optical filter and a second reflecting mirror, wherein the other end of the third gain fiber 1173 is connected to the second reflecting mirror through the second optical filter.
The first 1160 and second 1180 filter reflectors have different parameters.
The parameters of the filter reflector comprise: reflection efficiency, filter center wavelength, filter bandwidth. Different filter reflector parameters affect the oscillator output parameters, which correspond to the gain, output center wavelength, spectral width, and pulse width of the oscillator, respectively.
In the above technical solution, the beam splitter 1120 is a 1 × 2 type optical fiber coupler with a splitting ratio of 10:90, and the splitting ratio of the second communication end to the third communication end of the beam splitter 1120 is 10: 90.
In the above technical solution, the central coupler 1140 is a 2 × 2 fiber coupler with a 50:50 splitting ratio.
In the above technical scheme, the 1130 phase shifter is a non-reciprocal device, and can provide a fixed phase difference for signal light in forward and reverse directions in a Sagnac interferometric ring, thereby helping to realize self-starting mode locking of a nonlinear amplification ring mirror mode-locked oscillator.
In the above technical solution, the first filtering reflector 1160 is, for example, a fiber laser operating in a 1 μm band. The optical fiber Bragg grating with the central wavelength of 1070nm is set, the reflection bandwidth is 0.05nm, and the reflectivity is more than 99%. The output pulse of the corresponding mode-locked pulse oscillator has the central wavelength of 1070nm and the pulse width of 70 ps.
The second filtering reflector 1180 is exemplified by a fiber laser operating in a 1 μm band. The fiber Bragg grating with the central wavelength of 1030nm is taken as the fiber Bragg grating, the reflection bandwidth is 1nm, and the reflectivity is more than 60 percent. The central wavelength of the output pulse of the corresponding mode-locked pulse oscillator is 1030nm, and the pulse width is 10 ps. The filter reflector includes but is not limited to a device operating in a 1 μm band, and is also not limited to a form of a fiber bragg grating, or a form of a filter and a fiber mirror, and any other components or structures capable of realizing the functions of filtering and reflecting.
In the technical scheme, the output parameters of the oscillator are switched, and the competitive advantage of the path in the oscillator can be changed by adjusting the gain, loss, polarization and other effects of the two linear reflection arms, so that the switching of the output parameters of the laser is realized.
Output parameter switching, which means that the output parameter of the whole pulse oscillator is determined by the parameters of the filter reflectors in the two linear arms, for example, if one path of competition advantage is obvious (i.e. gain is higher or loss is smaller), the oscillator outputs the output parameter determined by the filter reflector; if the competitive advantage of the other path is obvious, the oscillator outputs the output parameter determined by the filter reflector of the other path; if the two competitive advantages are equal, the output parameters of the oscillator comprise the common characteristics of the two linear arms, and the oscillator is a typical dual-wavelength and dual-pulse laser oscillator.
The utility model discloses in, two way output pulse repetition frequency's difference can rely on to increase single mode fiber in the linear reflection arm of arbitrary the same kind and realize.
The output parameter switching may adopt the following operations: and after the pumping sources in the first optical fiber amplifier 1110 and the second optical fiber amplifier 1150 are started and increased to a certain power threshold value and spontaneous radiation laser in the gain medium is excited to generate, stable mode locking pulses can be formed in a resonant cavity formed by the laser sagnac interference ring and the first linear reflection arm, so that mode locking pulse output dominated by the first linear reflection arm can be respectively obtained, the central wavelength is 1070nm, and the pulse width is 70 ps. Then, the second fiber amplifier 1150 is turned off, the third fiber amplifier 1170 is turned on and raised to a certain power threshold, and a mode-locked pulse output dominated by the second linear reflection arm can be obtained, with a center wavelength of 1030nm and a pulse width of 10 ps. Thereby realizing the switching of the output parameters.
Furthermore, the utility model discloses still can realize the nonlinear amplification ring mirror mode locking pulse oscillator of a dual wavelength output. In contrast to the above, such a laser is realized by means of the following operations: the parameters of the first filtering reflector 1160 are modified. The fiber Bragg grating with the central wavelength of 1070nm is taken as the fiber Bragg grating, the reflection bandwidth is 1nm, and the reflectivity is more than 99 percent. The central wavelength of the output pulse of the corresponding mode-locked pulse oscillator is 1070nm, and the pulse width is 10 ps. The first fiber amplifier 1110, the second fiber amplifier 1150, and the third fiber amplifier 1170 are all turned on and raised to a certain power threshold. The spectrometer is used to observe the output pulse of the output end of the laser beam combiner 1120, and continuously optimize the pumping power of the second fiber amplifier 1150 and the third fiber amplifier 1170 until finally outputting a stable dual-wavelength mode-locked pulse.
The following explains a specific implementation of the present invention:
for the mode-locked pulse fiber laser, the mode-locked pulse is realized as a result of combined action of gain and loss in a resonant cavity, and when the gain in the cavity is larger than the loss, the mode-locked pulse can be stably output. The utility model discloses in, when the linear reflection arm exists alone wantonly all the way, the mode locking pulse homoenergetic can stably produce. The output parameters of which are mainly determined by the parameters of the filter reflector. When one of the paths has more obvious gain effect (i.e. the amplifier has higher power) and has more competitive advantage, the output parameter of the oscillator is determined by the linear reflection arm. By reducing the gain of the path, the working state of the oscillator can be switched to be dominated by the other path by improving the gain of the other path, thereby realizing the switching of the output parameters.
In addition, when the length difference of the two linear reflection arms is small (the repetition frequencies of the two output pulses are very close), the gain effects of the two paths are ensured to be at a same level. In the pulse evolution process, the action of the nonlinear effect (cross phase modulation) can realize a pulse oscillator with dual-wavelength simultaneous output. The oscillator can be used as a seed source of a double-optical comb spectrometer.
An oscillation output method using the above oscillator, comprising the steps of:
step 1: the first pump source 1111 outputs a pump laser signal, the pump laser signal is transmitted to the first gain fiber 1113 through the first wavelength division multiplexer 1112, and the first gain fiber 1113 radiates spontaneous emission laser according to the pump laser signal to form signal light;
step 2: the first gain fiber 1113 transmits the signal light to the second wavelength division multiplexer 1152 through the central coupler 1140, the second pump source 1151 outputs a pump laser signal, the second wavelength division multiplexer 1152 combines the signal light and the pump laser signal and then performs signal amplification through the second gain fiber 1153, and the first filter reflector 1160 reflects the combined light after signal amplification and then returns to the central coupler 1140 again;
and step 3: the central coupler 1140 couples the reflected signal light into the sagnac interference ring again, one signal light is transmitted clockwise, that is, one signal light sequentially passes through the phase shifter 1130, the beam splitter 1120 and the first fiber amplifier 1110, and the other signal light is transmitted counterclockwise, that is, the other signal light sequentially passes through the first fiber amplifier 1110, the beam splitter 1120 and the phase shifter 1130, and the two-way transmitted signal light is amplified by the first gain fiber 1113 and accumulated with a certain phase when passing through the first fiber amplifier 1110, but the accumulated phases are different because the two signal lights pass through different sequences and have a certain phase difference;
and 4, step 4: the signal light after the two-way transmission amplification returns to the central coupler 1140 again and carries a certain phase difference, when the phase difference is 2 pi, the two light beams are enhanced in interference, all the original paths return to the second optical fiber amplifier 1150 again, then the two light beams are reflected by the first filtering reflector 1160 again, and the steps are repeated in a circulating mode until stable mode locking pulses are formed and are output by the second communication end of the beam splitter (1120), and the parameters of the output pulses of the paths are determined by the first filtering reflector.
The operation principle of the linear path determined by the second linear reflection arm is the same as that of the steps 1-4. Only if the first fiber amplifier 1110 and the second fiber amplifier 1150 are turned on, the laser light is operated in the resonant cavity formed by the sagnac interferometric ring, the second fiber amplifier 1150 and the first filter reflector 1160 to form a pulse output; if the first fiber amplifier 1110 and the third fiber amplifier 1170 are turned on, the laser light runs in a resonant cavity formed by the sagnac interferometric ring, the third fiber amplifier 1170 and the second filter reflector 1180, and pulse output is formed; if the first optical fiber amplifier 1110, the second optical fiber amplifier 1150 and the third optical fiber amplifier 1170 are opened, and the second optical fiber amplifier 1150 and the third optical fiber amplifier 1170 have the same gain effect, laser is transmitted and operated together in a resonant cavity respectively formed by the sagnac interference ring and the first linear reflection arm, and the sagnac interference ring and the second linear reflection arm, so that dual-wavelength double-pulse laser output is formed.
Embodiment 1, a nonlinear amplification ring mirror mode-locked pulse oscillator with switchable output pulse parameters.
The utility model discloses a nonlinear amplification ring mirror mode locking has realized that an output wavelength changes (>40nm), and the pulse width difference (>50ps), the changeable ultrashort pulse fiber oscillator of output parameter of repetition frequency difference (MHz order of magnitude).
In embodiment 1, the first fiber amplifier 1110 may amplify the power of the signal light by using the stimulated emission effect of the laser. The device comprises a pumping source, a wavelength division multiplexer and a gain fiber.
The pumping source provides pumping energy for the oscillator. The central wavelength of the output pump laser is 974nm, and the maximum output power is 600 mW.
The wavelength division multiplexer is used for efficiently coupling the pump laser and the signal light into the gain optical fiber after being combined. The working band is 974/1030 nm.
In the embodiment, the gain fiber is a gain fiber with a fiber core doped with ytterbium ions, and 1000-1100 nm of spontaneous emission laser can be radiated after being excited by 974nm of pump light.
The first filtering reflector 1160 is a fiber Bragg grating with the central wavelength of 1070nm, the reflection bandwidth is 0.05nm, and the reflectivity is more than 99%. The output pulse of the corresponding mode-locked pulse oscillator has the central wavelength of 1070nm and the pulse width of 70 ps.
The second filtering reflector 1180 is a fiber bragg grating with a central wavelength of 1030nm, the reflection bandwidth is 1nm, and the reflectivity is greater than 60%. The central wavelength of the output pulse of the corresponding mode-locked pulse oscillator is 1030nm, and the pulse width is 10 ps.
In this embodiment, the difference between the repetition frequencies of the two output pulses can be realized by adding a single-mode fiber to any one of the linear reflection arms.
Example 1 was carried out by turning on and raising first fiber amplifier 1110 and second fiber amplifier 1150 to a power threshold to obtain a mode-locked pulse output dominated by the first linear reflector arm, centered at 1070nm, with a pulse width of 70 ps. Then, the second fiber amplifier 1150 is turned off, the third fiber amplifier 1170 is turned on and raised to a certain power threshold, and a mode-locked pulse output dominated by the second linear reflection arm can be obtained, with a center wavelength of 1030nm and a pulse width of 10 ps. Thereby realizing the switching of the output parameters.
Example 2, a two wavelength output nonlinear amplification ring mirror mode locked pulse oscillator. Compared with embodiment 1, embodiment 2 only changes the parameters of the filter reflector of the first linear reflection arm, and ensures that the lengths of the two linear reflection arms are consistent (error is less than 2 cm). The reason why the repetition frequency difference of the two-path mode-locking pulse is less than 200Hz is that when the two-path mode-locking pulse and the Sagnac interference ring evolve, the dual-wavelength output can be possible only through the clamping effect of cross phase modulation, and if the pulse repetition frequency difference is too much, the pulse walk-off is serious, and stable dual-wavelength pulse output is difficult to form.
Embodiment 2 changes only the parameters of the first filtering reflector 1160 compared to embodiment 1. The fiber Bragg grating with the central wavelength of 1070nm has the reflection bandwidth of 1nm and the reflectivity of more than 99 percent. The central wavelength of the output pulse of the corresponding mode-locked pulse oscillator is 1070nm, and the pulse width is 10 ps.
Example 2 is performed by turning on and raising each of the first fiber amplifier 1110, the second fiber amplifier 1150, and the third fiber amplifier 1170 to a power threshold. The output pulses from the output of the combiner 1120 are observed by a spectrometer, and the pumping powers of the second fiber amplifier 1150 and the third fiber amplifier 1170 are continuously optimized until stable dual-wavelength mode-locked pulses are finally output.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (9)
1. An amplified ring mirror pulse oscillator with switchable output parameters, comprising: the high-power Sagnac pulse oscillator comprises a Sagnac interference ring, a central coupler (1140), a first linear reflection arm and a second linear reflection arm, wherein the Sagnac interference ring and the central coupler (1140) and the first linear reflection arm and/or the second linear reflection arm form a nonlinear amplification ring mirror pulse oscillator.
2. The switchable output parameter amplified ring mirror pulse oscillator of claim 1, wherein: the Sagnac interference ring comprises a first optical fiber amplifier (1110), a beam splitter (1120) and a phase shifter (1130), wherein the first optical fiber amplifier (1110) comprises a first pump source (1111), a first wavelength division multiplexer (1112) and a first gain optical fiber (1113), the signal output end of the first pump source (1111) is connected with the first communication end on the left side of the first wavelength division multiplexer (1112), the second communication end on the left side of the first wavelength division multiplexer (1112) is connected with the first communication end of the beam splitter (1120), the communication end on the right side of the first wavelength division multiplexer (1112) is connected with one end of the first gain optical fiber (1113), the other end of the first gain optical fiber (1113) is connected with the first communication end on the left side of a central coupler (1140), the second communication end of the beam splitter (1120) is an oscillator mode-locked pulse output end, the third communication end of the beam splitter (1120) is connected with the first communication end of the phase shifter (1130), the second communication terminal of the phase shifter (1130) is connected to the left second communication terminal of the central coupler (1140).
3. The output parameter switchable amplification ring mirror pulse oscillator of claim 2, wherein: the first linear reflection arm comprises a second optical fiber amplifier (1150) and a first filtering reflector (1160), the second optical fiber amplifier (1150) comprises a second pumping source (1151), a second wavelength division multiplexer (1152) and a second gain optical fiber (1153), a signal output end of the second pumping source (1151) is connected with a left first communication end of the second wavelength division multiplexer (1152), a left second communication end of the second wavelength division multiplexer (1152) is connected with a right first communication end of the central coupler (1140), a right communication end of the second wavelength division multiplexer (1152) is connected with one end of the second gain optical fiber (1153), and the other end of the second gain optical fiber (1153) is connected with a communication end of the first filtering reflector (1160).
4. An amplified ring mirror pulse oscillator as claimed in claim 2 or 3 with switchable output parameters, characterized in that: the second linear reflection arm comprises a third optical fiber amplifier (1170) and a second filtering reflector (1180), the third optical fiber amplifier (1170) comprises a third pumping source (1171), a third wavelength division multiplexer (1172) and a third gain optical fiber (1173), the signal output end of the third pumping source (1171) is connected with the first left communication end of the third wavelength division multiplexer (1172), the second left communication end of the third wavelength division multiplexer (1172) is connected with the second right communication end of the central coupler (1140), the right communication end of the third wavelength division multiplexer (1172) is connected with one end of the third gain optical fiber (1173), and the other end of the third gain optical fiber (1173) is connected with the communication end of the second filtering reflector (1180).
5. The switchable output parameter amplified ring mirror pulse oscillator of claim 4, wherein: the doping ion types of the first gain fiber (1113), the second gain fiber (1153) and the third gain fiber (1173) comprise erbium, ytterbium, thulium, holmium and neodymium ions.
6. The switchable output parameter amplified ring mirror pulse oscillator of claim 3, wherein: the first filter reflector (1160) is a first fiber Bragg grating, one end of the first fiber Bragg grating is connected with the other end of the second gain fiber (1153), and the other end of the first fiber Bragg grating is empty;
or the first filtering reflector (1160) is composed of a first optical filter and a first reflector, wherein the other end of the second gain optical fiber (1153) is connected with the first reflector through the first optical filter.
7. The switchable output parameter amplified ring mirror pulse oscillator of claim 4, wherein: the second filter reflector (1180) is a second fiber Bragg grating, one end of the second fiber Bragg grating is connected with the other end of the third gain fiber (1173), and the other end of the second fiber Bragg grating is empty;
or the second filter reflector (1180) is composed of a second optical filter and a second reflecting mirror, wherein the other end of the third gain optical fiber (1173) is connected with the second reflecting mirror through the second optical filter.
8. The output parameter switchable amplification ring mirror pulse oscillator of claim 2, wherein: the beam splitter (1120) is a 1 x 2 type optical fiber coupler with a beam splitting ratio of 10: 90.
9. The output parameter switchable amplification ring mirror pulse oscillator of claim 2, wherein: the central coupler (1140) is a 2 x 2 type fiber coupler having a 50:50 splitting ratio.
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