CN217984055U - All-polarization-maintaining optical fiber dispersion management annular cavity mode-locked femtosecond ytterbium-doped optical fiber laser - Google Patents
All-polarization-maintaining optical fiber dispersion management annular cavity mode-locked femtosecond ytterbium-doped optical fiber laser Download PDFInfo
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- H01S3/1115—Passive mode locking using intracavity saturable absorbers
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Abstract
The utility model discloses a full polarization maintaining optical fiber dispersion management ring chamber mode locking femto second mixes ytterbium fiber laser is applied to the laser field, and this fiber laser includes: the device comprises a double-tail fiber optical fiber collimation semiconductor saturable absorption mirror, a three-port circulator, a gain fiber, a chirped fiber grating, a wavelength division multiplexer and a pumping source; all the devices are welded together through single-mode polarization-maintaining fibers; the all-fiber device forms a laser resonant cavity between the semiconductor saturable absorption mirror and the fiber grating; the utility model discloses to the linear chamber of current semiconductor saturable absorber mirror mode locking easily forms parasitic oscillation, makes the intracavity mode locking unstable, leads to the semiconductor saturable absorber mirror anti-damage threshold value can greatly reduced, easily receives the problem of damage, has adopted the annular chamber structure, and laser instrument stability is high, is difficult for receiving the influence that optical fiber splice point back reflection and the terminal surface reflection of output port produced parasitic oscillation; the utility model discloses an extraluminal pumping, mode-locked laser easily realize high repetition frequency.
Description
Technical Field
The utility model belongs to the laser field, in particular to passive mode locking full polarization maintaining fiber laser ware technique based on semiconductor saturable absorber mirror.
Background
Ultrashort optical pulses are widely applied to the fields of ultrafast optical diagnosis, optical precision measurement, precision machining, laser medical treatment, bioengineering and the like, and are also the leading subjects of research directions of nonlinear optics, ultrafast optics and the like. The hundred-femtosecond-level ultrashort pulse has the characteristics of extremely narrow pulse width, ultra-wide spectrum, extremely high peak power and the like, and is widely applied to the research fields of dry optical frequency combing, molecular transient dynamics, nonlinear optics and the like. Compared with ultrashort pulse laser sources such as a solid laser, a semiconductor laser, a gas laser and a dye laser, the ultrashort pulse laser has the unique advantages of low manufacturing cost, simple and compact structure, no need of water cooling, high stability, high pumping conversion efficiency, low laser oscillation threshold, light beam quality close to diffraction limit and the like, and is favored in scientific research and industrial application. Mode locking is a main means for generating hundred femtosecond ultrashort pulses, and mode locking is mainly divided into an active mode locking mode and a passive mode locking mode. Active mode locking requires adding active modulation elements such as acousto-optic and electro-optic modulators in a cavity, the active modulation elements are generally polarization sensitive elements, and changes caused by external environment temperature, vibration and the like can influence the stability of a polarization state, so that modulation pulse is unstable, and the pulse width of a mode locking pulse output by a common active mode locking laser is ps to ns magnitude, and is difficult to be below ps. The passive mode locking does not need an additional modulation device, can realize an all-fiber structure, has small volume and strong anti-jamming capability, and can output pulse width reaching ps and fs magnitude.
The semiconductor saturable absorber mirror (SESAM for short) has an ultrafast time response characteristic and a mode-locked self-starting characteristic, so that the full polarization-maintaining fiber mode-locking technology based on the semiconductor saturable absorber mirror is widely applied to the research and development of industrial grade high-performance fiber mode-locked laser oscillators. The basic structure of a semiconductor saturable absorber mirror is to combine a mirror with a semiconductor saturable absorber. The bottom layer is generally a semiconductor reflector, a semiconductor saturable absorber film is grown on the bottom layer, the uppermost layer can be grown with a reflector or directly uses the interface of the semiconductor and air as the reflector, so that the upper reflector and the lower reflector form a Fabry-Perot cavity, and the modulation depth of the absorber and the bandwidth of the reflector can be adjusted by changing the thickness of the absorber and the reflectivity of the two reflectors. The semiconductor saturable absorption mirror has the disadvantages of low damage-resistant threshold, irreversible loss and relatively short service life. A common semiconductor saturable absorber mirror laser cavity usually adopts a linear cavity structure, but a laser resonant cavity formed by the structure has certain problem in stability, the linear cavity is a standing wave cavity, and due to the problems of back reflection of an optical fiber fusion point and end surface reflection of an output port, part of signal light is easy to form parasitic oscillation in the cavity, the mode locking stability of the original resonant cavity is seriously influenced, so that the damage resistance threshold of the semiconductor saturable absorber mirror is greatly reduced, and the semiconductor saturable absorber mirror is extremely easy to damage.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a full polarization maintaining optical fiber dispersion management ring cavity mode-locked femtosecond ytterbium-doped fiber laser, which has good self-starting performance and high stability; and the utility model discloses a polarization maintaining fiber structure's chirp fiber grating (CFBG) carries out the dispersion management to the resonance intracavity for laser instrument work is in nearly zero dispersion district, and the hundred femto second grade ultrashort optical pulse output that can obtain the broad spectrum through the chamber outside the compression of chirp that goes.
The utility model adopts the technical proposal that: a full polarization maintaining optical fiber dispersion management annular cavity mode-locked femtosecond ytterbium-doped fiber laser comprises the following devices:
the device comprises a double-tail fiber optical fiber collimation semiconductor saturable absorption mirror, a three-port circulator, a gain fiber, a chirped fiber grating, a wavelength division multiplexer and a pumping source;
all the devices are welded together through single-mode polarization-maintaining fibers;
the three-port circulator and the gain fiber are arranged between the double-tail fiber optical fiber collimation semiconductor saturable absorber mirror and the chirped fiber grating, a laser resonant cavity is formed between the double-tail fiber optical fiber collimation semiconductor saturable absorber mirror and the chirped fiber grating, pump light generated by a pump source enters the gain fiber, the gain fiber generates signal light through spontaneous radiation after absorbing the pump light, the signal light enters the double-tail fiber optical fiber collimation semiconductor saturable absorber mirror through the three-port circulator, the double-tail fiber optical fiber collimation semiconductor saturable absorber mirror reflects the signal light of a high pulse peak power part back to the laser resonant cavity, one part of the signal light of the high pulse peak power part is reflected back to the laser resonant cavity at the chirped fiber grating, and the other part of the signal light is transmitted to be output as mode-locked laser.
When the wavelength division multiplexer and the pumping source are arranged outside the laser resonant cavity:
the input end of the semiconductor saturable absorption mirror is connected with the third port of the three-port circulator through a single-mode polarization-maintaining optical fiber, the output end of the semiconductor saturable absorption mirror is connected with the first port of the three-port circulator through the single-mode polarization-maintaining optical fiber, the second port of the three-port circulator is connected with one end of the gain optical fiber, the other end of the gain optical fiber is connected with the input end of the chirped fiber grating, the output end of the pumping source is connected with one pumping end of the wavelength division multiplexer, the public end of the wavelength division multiplexer is connected with the transmission output end of the chirped fiber grating through the single-mode polarization-maintaining optical fiber, and the signal light end of the wavelength division multiplexer serves as a mode-locked laser output end.
When wavelength division multiplexer and pumping source set up in the laser resonator:
the input end of the semiconductor saturable absorption mirror is connected with the third port of the three-port circulator through the single-mode polarization-maintaining optical fiber, the output end of the semiconductor saturable absorption mirror is connected with the signal light end of the wavelength division multiplexer through the single-mode polarization-maintaining optical fiber, the pumping end of the wavelength division multiplexer is connected with the output end of the pumping source, the public end of the wavelength division multiplexer is connected with the first end of the gain optical fiber through the single-mode polarization-maintaining optical fiber, the second end of the gain optical fiber is connected with the first port of the three-port circulator through the single-mode polarization-maintaining optical fiber, the second port of the three-port circulator is connected with the input end of the chirped fiber grating, and the output end of the chirped fiber grating is used as a mode-locked laser output end.
The gain fiber is ytterbium-doped fiber with length of 0.4m.
The dispersion value of the chirped fiber grating is 0.2-0.42 ps/nm, the reflectivity is 10% -25%, and the bandwidth is 10-25 nm.
The pumping source is a semiconductor laser diode.
The wavelength range of the pump source is the absorption wavelength of the gain fiber.
The utility model has the advantages that: the fiber laser of the utility model has good self-starting performance and high stability; meanwhile, the chirp fiber grating (CFBG) of the polarization maintaining fiber structure is adopted to carry out dispersion management on the inside of the resonant cavity, so that the laser works in a near-zero dispersion region, and hundred-femtosecond laser pulse output with a wide spectrum can be obtained through chirp removal compression outside the cavity; the problem of unstable mode locking caused by parasitic oscillation formed by backward reflection of an optical fiber fusion point and end face reflection of an output optical fiber in the mode-locked laser is solved;
the utility model discloses the technical advantage who compares with current linear cavity structure mode-locked laser based on SESAM does: the utility model discloses mode-locked laser mode locking is stable, adopts the annular chamber structure to form the travelling wave chamber, reduction end face loss problem that can to a great extent, the intracavity is difficult for forming parasitic oscillation to threshold value characteristic is also better.
Drawings
FIG. 1 is a first structural schematic diagram of a full polarization maintaining fiber dispersion management ring cavity mode-locked femtosecond fiber laser;
FIG. 2 is a schematic diagram of a second structure of a full polarization maintaining fiber dispersion management ring cavity mode-locked femtosecond fiber laser;
FIG. 3 is a schematic structural diagram of a double pigtail fiber-collimated semiconductor saturable absorber mirror;
fig. 4 is a graph of the experimental results of the present invention, in fig. 4, (a) is a spectrogram of mode-locked output pulses, (b) is a pulse sequence, (c) is an output pulse radio frequency spectrum, (d) is a direct output pulse autocorrelation curve, and (e) is an autocorrelation curve after compression of the output pulses;
reference numerals: 1-double-pigtailed fiber collimation SESAM, 2-three-port circulator, 3-gain fiber, 4-chirped fiber grating, 5-wavelength division multiplexer, 6-semiconductor laser pumping source, 11-SESAM, 12-collimating lens, 13-input polarization-maintaining single-mode fiber, 14-output polarization-maintaining single-mode fiber, and 2-1, 2-2 and 2-3 are three ports of the three-port circulator respectively.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Fig. 1 is a full polarization maintaining fiber dispersion management annular cavity mode-locked femtosecond fiber laser structure schematic diagram, the utility model provides a pair of full polarization maintaining fiber dispersion management annular cavity mode-locked femtosecond fiber laser, include: the device comprises a double-pigtail fiber collimation SESAM 1, a three-port circulator 2, a gain fiber 3, a chirped fiber grating 4, a wavelength division multiplexer 5 and a pumping source 6; and all the devices are welded together through single-mode polarization-maintaining fibers.
Wherein, the input port of the double-pigtail fiber collimation SESAM 1 is connected with the ports 2-3 of the three-port circulator 2; the output port of the double-pigtail fiber collimation SESAM 1 is connected with the port 2-1 of the three-port circulator 2; a port 2-2 of the three-port circulator 2 is connected with one end of a gain fiber 3; the other end of the gain fiber 3 is connected with the input end of the chirped fiber grating 4; the pumping end of the wavelength division multiplexer 5 is connected with the output end of the pumping source 6; the common end of the wavelength division multiplexer is connected with the output end of the chirped fiber grating 4; a laser resonant cavity is formed between the double-tail fiber collimation SESAM 1 and the chirped fiber grating 4, and a signal light end of the wavelength division multiplexer 5 is used as a mode-locked laser output end.
The utility model utilizes the double-pigtail fiber collimation SESAM 1 and the chirped fiber grating 4 to form an optical resonant cavity, increases the output energy of a pumping source, and meets the mode locking condition when the gain in the cavity is more than the loss, thereby realizing the output of mode locking laser; the chirped fiber grating is used for carrying out intracavity dispersion compensation, and hundred femtosecond laser pulse output with wide spectrum can be obtained through the out-cavity chirp removal compression.
The utility model discloses a theory of operation is: pump source 6 produces the pump light after circular telegram, the pump light enters into gain fiber 3 through wavelength division multiplexer 5 and chirp fiber grating 4, and spontaneous emission produces the signal light behind the gain fiber 3 absorption pump light, and the signal light passes through port 2-2 of three-port circulator 2 and enters into two tail fiber collimation SESAM 1 after reaching port 2-3, and low pulse peak power part is absorbed by SESAM 11, and high pulse peak power part is reflected back to the intracavity by SESAM 11, to used SESAM 11, its saturation optical power density is 32.8MW/cm 2 The low pulse peak power portion means less than 32.8MW/cm 2 Partially, and partially with high pulse peak power, means greater than 32.8MW/cm 2 Part (c) of (a). The signal light reflected by the SESAM reaches the port 2-2 through the port 2-1 of the three-port circulator 2, then passes through the gain fiber 3, and is partially reflected and transmitted through the chirped fiber grating 4, and part of the signal light which meets the set wavelength range (the central wavelength is 1030nm, and the bandwidth is 10-25 nm) is reflected back into the cavity by the chirped fiber grating 4 to form a laser resonant cavity. The tail fiber of the three-port circulator 2 is a polarization-maintaining single-mode fiber, light is output from a port 2-1 to a port 2-2 of the circulator, and light is output from the port 2-2 to a port 2-3, so that unidirectional transmission of the light in the ring is guaranteed. When the output energy of the pump light is weaker, the loss in the laser cavity is larger than the gain, and pulse laser cannot be generated. The generated pulse laser is transmitted out from one end of the chirped fiber grating 4 and transmitted through the signal light end of the wavelength division multiplexer 5 to be output as mode-locked laser.
As another structure form of the laser resonant cavity, FIG. 2 shows a mode-locked femtosecond with a fully polarization-maintaining fiber dispersion management ring cavityThe structure schematic diagram of the fiber laser is that the wavelength division multiplexer 5, the pumping source 6 and the gain fiber 3 in fig. 1 are placed in a fiber ring, and the mode locking of the fiber laser can be realized by increasing pumping energy in a cavity. The specific working principle is as follows: the pumping source 6 generates pumping light after being electrified, the pumping light enters the gain fiber 3 through the wavelength division multiplexer 5, the gain fiber 3 absorbs the pumping light and then spontaneously radiates to generate signal light, the signal light is transmitted to the port 2-2 from the port 2-1 of the three-port circulator 2, the signal light emitted from the port 2-2 is transmitted to the chirped fiber grating 4 through the optical fiber to be partially reflected and transmitted, part of the signal light which meets the set wavelength range (the central wavelength is 1030nm, and the bandwidth is 10-25 nm) is reflected back to the cavity by the chirped fiber grating 4, the reflected signal light is transmitted to the port 2-3 from the port 2-2 of the three-port circulator 2 and then enters the double-tail fiber collimation SESAM 1, the lower part of the pulse peak power is absorbed by the SESAM 11, and the higher part of the pulse peak power is reflected back to the cavity by the SESAM 11 to form a laser resonant cavity, for the SESAM 11 used in the utility model, the saturated light power density is 32.8MW/cm 2 The low pulse peak power portion means less than 32.8MW/cm 2 Partially, and partially with high pulse peak power, means greater than 32.8MW/cm 2 Part (c) of (a).
The tail fiber of the three-port circulator 2 adopts a polarization-maintaining single-mode fiber, light is output from a port 2-1 to a port 2-2 of the circulator, and light is output from the port 2-2 to a port 2-3, so that unidirectional transmission of the light in the ring is ensured. When the output energy of the pump light is weaker, the loss in the laser cavity is larger than the gain, pulse laser cannot be generated, when the energy of the pump light is increased to a certain value by increasing the current, the gain in the laser cavity is larger than the loss, the mode locking condition of a laser is met, and the pulse laser is generated. The generated pulse laser is transmitted out from one end of the chirped fiber grating 4 to be output as mode-locked laser.
The gain fiber 3 is a rare earth doped fiber, selected from ytterbium doped fiber, neodymium doped fiber, erbium doped fiber or thulium doped fiber, etc., the utility model discloses preferred ytterbium doped fiber, its absorption wavelength is 915-976nm, length is 0.2-1 m. The gain fiber of this example is an ytterbium-doped fiber with a length of 0.4m. It should be noted by those skilled in the art that when the gain fiber 3 is other rare-earth doped fiber, the length of the gain fiber 3 can be determined according to the parameters of the particular rare-earth doped fiber.
The tail fiber of the chirped fiber grating 4 is a polarization maintaining single mode fiber, the dispersion value is 0.2-0.42 ps/nm, the reflectivity is 10% -25%, and the bandwidth is 10-25 nm. For example, the chirped fiber grating of the present invention has a dispersion value of 0.21ps/nm, a reflectivity of 10%, and a bandwidth of 25nm.
The pumping source 6 adopts a semiconductor laser diode, the wavelength range of the semiconductor laser diode is the absorption wavelength of the gain fiber 3, the common pumping wavelength is 976nm, the power is generally less than 1W, and the output form is a single-mode fiber.
The wavelength division multiplexer 5 and the pump source 6 can be placed in the cavity of the laser resonator or outside the cavity of the laser resonator. In this example, the fiber loop length of the saturable absorber mirror 1 connected to the three-port circulator 2 is 1.91m, and the fiber length of the linear reflection arm between the three-port circulator 2 and the chirped fiber grating 4 is 1.40m, at which time the output pulse repetition frequency corresponding to the cavity length of the mode-locked laser is 43.62MHz.
Fig. 3 is a schematic structural diagram of a double-pigtailed fiber collimating semiconductor saturable absorber mirror, where the SESAM is a reflective saturable absorber selected from a semiconductor, a nanotube, or graphene, and a full fiber structure is implemented by coupling double-pigtailed collimators. Mainly comprises an SESAM 11, a collimating lens 12, a polarization-preserving single-mode fiber 13, a polarization-preserving single-mode fiber 14 and a heat-dissipating copper block 15; the SESAM 11 is embedded on a heat sink copper block 15. The signal light enters the SESAM 11 through the input polarization-preserving single-mode fiber 13, the low pulse peak power part is absorbed by the SESAM, the high pulse peak power part is reflected by the SESAM, and the reflected signal light passes through the collimating lens 12 and then exits through the output polarization-preserving single-mode fiber 14.
The utility model discloses an experimental result as follows:
when the pumping power is 50mW, the laser can stably and automatically start the mode locking, and the average output power is 4.3mW. The specific output characteristics of the pulses at this time are shown in fig. 4: FIG. 4 (a) is a spectrum of the output pulse, the spectrum is approximately Gaussian, the center wavelength is 1032.81nm, and the 3dB bandwidth is 15.09nm. Fig. 4 (b) is a sequence diagram of the output pulses with a pulse spacing of about 22.93ns. FIG. 4 (c) shows the output pulse radio spectrum with a pulse repetition frequency of 43.62MHz and a signal-to-noise ratio of 74dB. Fig. 4 (d) is a direct output pulse autocorrelation curve, measuring a pulse width of 1.346ps. Fig. 4 (e) is an autocorrelation curve of the output pulse after the grating-to-extracavity chirped compression, measured as a compressed pulse width of 135fs.
In fig. 4 (a), the abscissa Wavelength is the Wavelength, and the ordinate Intensity (dBm) is the spectral Intensity; in fig. 4 (b), the abscissa Time (ns) is Time and the ordinate Intensity (a.u.) is the normalized Intensity of the pulse sequence; in fig. 4 (c), the abscissa Frequency (MHz) is Frequency, and the ordinate Power (dB) is rf signal intensity; in fig. 4 (d) and (e), the abscissa Time (ps) is Time, and the ordinate Intensity (a.u.) is normalized Intensity of the pulse autocorrelation.
To sum up, the utility model provides a fine dispersion management annular chamber mode locking femto second fiber laser of full polarization maintaining optical fiber, it has all optical fiber structure, can compactification encapsulation, realizes a novel structure of mode locking based on two tail optical fiber collimation semiconductor saturable absorber mirrors. Utilize this structure utility model's fiber laser self-starting performance good, the interference killing feature is strong, can obtain hundred femto second level laser ultrashort pulse output, can regard as the good kind seed source of amplifier system.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (7)
1. A mode-locked femtosecond ytterbium-doped fiber laser with a fully polarization-maintaining fiber dispersion management annular cavity is characterized by comprising the following devices:
the device comprises a double-tail fiber optical fiber collimation semiconductor saturable absorption mirror, a three-port circulator, a gain fiber, a chirped fiber grating, a wavelength division multiplexer and a pumping source;
all the devices are welded together through single-mode polarization maintaining fibers;
the three-port circulator and the gain fiber are arranged between the double-tail fiber optical fiber collimation semiconductor saturable absorber mirror and the chirped fiber grating, a laser resonant cavity is formed between the double-tail fiber optical fiber collimation semiconductor saturable absorber mirror and the chirped fiber grating, pump light generated by a pump source enters the gain fiber, the gain fiber generates signal light through spontaneous radiation after absorbing the pump light, the signal light enters the double-tail fiber optical fiber collimation semiconductor saturable absorber mirror through the three-port circulator, the double-tail fiber optical fiber collimation semiconductor saturable absorber mirror reflects the signal light of a high pulse peak power part back to the laser resonant cavity, one part of the reflected signal light is transmitted to the chirped fiber grating and is reflected back to the laser resonant cavity, and the other part of the reflected signal light is output as mode-locked laser.
2. The apparatus of claim 1, wherein when the wavelength division multiplexer and the pump source are disposed outside the laser resonator:
the input end of the semiconductor saturable absorption mirror is connected with the third port of the three-port circulator through a single-mode polarization-maintaining optical fiber, the output end of the semiconductor saturable absorption mirror is connected with the first port of the three-port circulator through the single-mode polarization-maintaining optical fiber, the second port of the three-port circulator is connected with one end of the gain optical fiber, the other end of the gain optical fiber is connected with the input end of the chirped fiber grating, the output end of the pumping source is connected with the pumping end of the wavelength division multiplexer, the public end of the wavelength division multiplexer is connected with the transmission output end of the chirped fiber grating through the single-mode polarization-maintaining optical fiber, and the signal light end of the wavelength division multiplexer serves as a mode-locked laser output end.
3. The fiber dispersion management ring cavity mode-locked femtosecond ytterbium-doped fiber laser device of claim 1, wherein when the wavelength division multiplexer and the pump source are disposed in the laser resonator:
the input end of the semiconductor saturable absorption mirror is connected with the third port of the three-port circulator through a single-mode polarization-maintaining fiber, the output end of the semiconductor saturable absorption mirror is connected with the signal light end of the wavelength division multiplexer through the single-mode polarization-maintaining fiber, the pumping end of the wavelength division multiplexer is connected with the output end of the pumping source, the public end of the wavelength division multiplexer is connected with the first end of the gain fiber through the single-mode polarization-maintaining fiber, the second end of the gain fiber is connected with the first port of the three-port circulator through the single-mode polarization-maintaining fiber, the second port of the three-port circulator is connected with the input end of the chirped fiber grating, and the output end of the chirped fiber grating is used as a mode-locked laser output end.
4. The apparatus of claim 2 or 3, wherein the gain fiber is an ytterbium-doped fiber.
5. The apparatus of claim 2 or 3, wherein the chirped fiber grating has a dispersion value of 0.2-0.42 ps/nm, a reflectivity of 10% -25%, and a bandwidth of 10-25 nm.
6. The apparatus of claim 2 or 3, wherein the pump source is a semiconductor laser diode.
7. The apparatus of claim 6, wherein the pump source has a wavelength in the absorption wavelength range of the gain fiber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021110317268 | 2021-09-03 | ||
| CN202111031726.8A CN113725706A (en) | 2021-09-03 | 2021-09-03 | All-polarization-maintaining optical fiber dispersion management annular cavity mode-locked femtosecond ytterbium-doped optical fiber laser |
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| Publication Number | Publication Date |
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| CN217984055U true CN217984055U (en) | 2022-12-06 |
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| CN202111031726.8A Pending CN113725706A (en) | 2021-09-03 | 2021-09-03 | All-polarization-maintaining optical fiber dispersion management annular cavity mode-locked femtosecond ytterbium-doped optical fiber laser |
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| CN116154594B (en) * | 2023-04-20 | 2023-09-26 | 北京工业大学 | All-fiber structure medium infrared mode-locked laser oscillator |
| CN117589428B (en) * | 2024-01-19 | 2024-06-04 | 中国工程物理研究院激光聚变研究中心 | Device and method for evaluating pumping characteristics of semiconductor laser |
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