CN114421271A - All-fiber neodymium-doped fiber laser - Google Patents
All-fiber neodymium-doped fiber laser Download PDFInfo
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06725—Fibre characterized by a specific dispersion, e.g. for pulse shaping in soliton lasers or for dispersion compensating [DCF]
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- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
- H01S3/1118—Semiconductor saturable absorbers, e.g. semiconductor saturable absorber mirrors [SESAMs]; Solid-state saturable absorbers, e.g. carbon nanotube [CNT] based
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Abstract
The invention relates to the technical field of lasers, and provides an all-fiber neodymium-doped fiber laser, which comprises: the optical fiber coupling device comprises a first 808 nm waveband single-mode optical pumping source, a first 808/920 nm optical fiber wavelength division multiplexer, a single-cladding neodymium-doped optical fiber, an optical fiber type filter device, a 920nm weak signal filtering device and an optical fiber coupler; the first 808/920 nm optical fiber wavelength division multiplexer, the single cladding neodymium-doped optical fiber, the optical fiber type filter, the 920nm weak signal filtering device and the optical fiber coupler form a loop-shaped optical fiber laser cavity. The all-fiber neodymium-doped fiber laser provided by the invention can effectively filter out spontaneous radiation of 1060-1090nm wave band, so that mode locking starting of 920nm wave band becomes easier, and the signal-to-noise ratio of output ultrashort pulse of 920nm wave band can be improved.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to an all-fiber neodymium-doped fiber laser.
Background
The ultrashort pulse laser with the wavelength of 920nm has good application in the two-photon fluorescence imaging of neuroscience, and is particularly suitable for observing living cells and tissues marked by green fluorescent protein. The living body cell to be observed marked by the fluorescent protein can absorb 2 photons of 920nm in a femtosecond time range, which is equivalent to 1 photon of 460nm, thereby releasing a fluorescent signal of 500-550 nm wave band. Because two-photon excitation has requirements on the time-space energy density of laser, the background fluorescence of a non-focus area can be greatly weakened, so that the signal-to-noise ratio of imaging is improved by multiple orders of magnitude, and meanwhile, the area generating negative effects such as phototoxicity and photobleaching and the like is limited to the focus with the scale of only hundred nanometers. In addition, since 920nm near infrared light of a long wavelength is less scattered in the specimen than 460nm visible light of a short wavelength, it is more suitable to observe the appearance below the surface layer of the specimen using two-photon excitation than using single-photon excitation.
In the prior art, the methods for generating 920nm ultrashort pulses are roughly classified into the following types: using a titanium gem tunable laser or optical parametric oscillation and other methods; shifting the frequency from other wave bands (such as 1030 nm wave bands corresponding to ytterbium-doped optical fibers or 1550 nm wave bands corresponding to erbium-doped optical fibers) to 920nm by utilizing the nonlinear effect of the optical fibers; the pulse of the wave band is generated by directly utilizing a seed source of the neodymium-doped fiber.
The scheme of generating the pulse (i.e. mode locking) of the band by using the seed source of the neodymium-doped fiber faces an inherent difficulty, namely that the main radiation peak of most neodymium-doped fibers is 1060-1090nm band, for the formation of 920nm ultrashort pulse, the radiation of more than 1 μm becomes a competition band, and the noise light makes it difficult for the 920nm band to start mode locking.
Disclosure of Invention
The invention provides an all-fiber neodymium-doped fiber laser, which is used for solving the defects that the 920nm ultrashort pulse fiber laser in the prior art influences mode locking starting and output signal-to-noise ratio reduction due to the existence of noise light in 1060-1090nm wave bands, and realizing effective filtering of spontaneous radiation in 1060-1090nm wave bands.
The invention provides an all-fiber neodymium-doped fiber laser, which comprises: the optical fiber coupling device comprises a first 808 nm waveband single-mode optical pumping source, a first 808/920 nm optical fiber wavelength division multiplexer, a single-cladding neodymium-doped optical fiber, an optical fiber type filter device, a 920nm weak signal filtering device and an optical fiber coupler; the first 808/920 nm optical fiber wavelength division multiplexer, the single cladding neodymium-doped optical fiber, the optical fiber type filter device, the 920nm weak signal filtering device and the optical fiber coupler form a loop optical fiber laser cavity;
the input end of the first 808/920 nm optical fiber wavelength division multiplexer is connected to the single-mode optical pumping source with the first 808 nm waveband, and the first transmission end of the first 808/920 nm optical fiber wavelength division multiplexer is connected to one end of the single-cladding neodymium-doped optical fiber;
a first output end of the optical fiber coupler is connected to a second transmission end of the first 808/920 nm optical fiber wavelength division multiplexer, and a second output end of the optical fiber coupler is connected with an output optical path;
the optical fiber type filter device and the 920nm weak signal filtering device are connected between the other end of the single-clad neodymium-doped optical fiber and the input end of the optical fiber coupler.
According to the all-fiber type neodymium-doped fiber laser provided by the invention, the fiber type filter device is an 920/1060 nm wavelength division multiplexer, the input end of the 920/1060 nm wavelength division multiplexer is connected with the other end of the single-cladding neodymium-doped fiber, the first output end of the 920/1060 nm wavelength division multiplexer is connected with the fiber coupler, and the second output end of the 920/1060 nm wavelength division multiplexer is connected with a suspended output fiber so as to filter noise light in 1060-1090nm waveband.
According to the all-fiber neodymium-doped fiber laser provided by the invention, the fiber filter is a fiber Bragg grating.
According to the all-fiber neodymium-doped fiber laser provided by the invention, the 920nm weak signal filter comprises a fiber circulator and a reflective saturable absorber, wherein the signal light input end of the fiber circulator is connected to the other end of the single-cladding neodymium-doped fiber, and the reflected light output end of the fiber circulator is connected to the input end of the fiber coupler; and the signal light output end of the optical fiber circulator is connected to the reflective saturable absorber.
According to the all-fiber neodymium-doped fiber laser provided by the invention, the reflective saturable absorber is a semiconductor saturable absorber mirror or a reflector for fixing graphene, a carbon nano tube or black phosphorus.
The all-fiber neodymium-doped fiber laser further comprises an optical fiber type dispersion management device, wherein the optical fiber type dispersion management device is connected between the input end of the optical fiber coupler and the output end of the 920nm weak signal filtering device.
The all-fiber neodymium-doped fiber laser further comprises a 920nm fiber isolator, wherein the 920nm fiber isolator is arranged on the output light path, and the input end of the 920nm fiber isolator is connected to the second output end of the fiber coupler.
The all-fiber neodymium-doped fiber laser further comprises a second 808 nm-waveband single-mode optical pumping source and a second 808/920 nm-fiber wavelength division multiplexer, wherein the input end of the second 808/920 nm-fiber wavelength division multiplexer is connected to the second 808 nm-waveband single-mode optical pumping source, and the first transmission end of the second 808/920 nm-fiber wavelength division multiplexer is connected to the other end of the single-cladding neodymium-doped fiber.
According to the all-fiber type neodymium-doped fiber laser provided by the invention, the number of the single-cladding neodymium-doped fibers is multiple, the number of the first 808 nm waveband single-mode optical pumping source, the number of the first 808/920 nm fiber wavelength division multiplexer, the number of the second 808 nm waveband single-mode optical pumping source and the number of the second 808/920 nm fiber wavelength division multiplexer are multiple, the multiple first 808 nm waveband single-mode optical pumping sources and the first 808/920 nm fiber wavelength division multiplexer are in one-to-one correspondence, the multiple second 808 nm waveband single-mode optical pumping sources and the second 808/920 nm fiber wavelength division multiplexer are in one-to-one correspondence, two ends of each single-cladding neodymium-doped fiber are respectively and correspondingly connected with a first transmission end of the first 808/920 nm fiber wavelength division multiplexer and a first transmission end of the second 808/920 nm fiber wavelength division multiplexer, and the second transmission ends of the plurality of first 808/920 nm optical fiber wavelength division multiplexers and the second transmission ends of the plurality of second 808/920 nm optical fiber wavelength division multiplexers are connected in the loop-shaped optical fiber laser cavity.
According to the all-fiber type neodymium-doped fiber laser, laser of a first 808 nm waveband single-mode optical pumping source is input into a cavity through a first 808/920 nm wavelength division multiplexer, spontaneous radiation of a 920nm mixed 1060-. Compared with the prior art, the all-fiber neodymium-doped fiber laser can effectively filter out spontaneous radiation in 1060-1090nm wave bands, enables mode locking starting of 920nm wave bands to be easier, and can improve the signal-to-noise ratio of output ultrashort pulses in 920nm wave bands.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an all-fiber nd-doped fiber laser according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an all-fiber nd-doped fiber laser according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an all-fiber neodymium-doped fiber laser according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of an all-fiber neodymium-doped fiber laser according to a fourth embodiment of the present invention;
reference numerals:
11: a first 808 nm wave band single-mode optical pumping source; 12: a second 808 nm wave band single-mode optical pumping source; 21: a first 808/920 nm fiber optic wavelength division multiplexer; 22: a second 808/920 nm fiber wavelength division multiplexer; 30: a single clad neodymium-doped fiber; 41: 920/1060 nm wavelength division multiplexer; 42: a fiber bragg grating; 51: a fiber optic circulator; 52: a reflective saturable absorber; 60: a fiber coupler; 70: 920nm optical fiber type isolator; 80: a fiber-optic dispersion management device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following describes the all-fiber type neodymium-doped fiber laser of the present invention with reference to fig. 1 to 4.
Referring to fig. 1 to 4, the present invention provides an all-fiber type neodymium-doped fiber laser, including: a first 808 nm wave band single-mode optical pump source 11, a first 808/920 nm optical fiber wavelength division multiplexer 21, a single cladding neodymium-doped optical fiber 30, an optical fiber type filter device, a 920nm weak signal filtering device and an optical fiber coupler 60; the first 808/920 nm optical fiber wavelength division multiplexer 21, the single cladding neodymium-doped optical fiber 30, the optical fiber type filter device, the 920nm weak signal filtering device and the optical fiber coupler 60 form a loop-shaped optical fiber laser cavity;
the input end of the first 808/920 nm optical fiber wavelength division multiplexer 21 is connected to the first 808 nm waveband single-mode optical pumping source 11, and the first transmission end of the first 808/920 nm optical fiber wavelength division multiplexer 21 is connected to one end of the single-cladding neodymium-doped optical fiber 30;
a first output end of the optical fiber coupler 60 is connected to a second transmission end of the first 808/920 nm optical fiber wavelength division multiplexer 21, and a second output end of the optical fiber coupler 60 is connected to an output optical path;
the optical fiber type filter device and the 920nm weak signal filtering device are connected between the other end of the single-cladding neodymium-doped optical fiber 30 and the input end of the optical fiber coupler 60.
In the structure, all the optical fiber devices are connected through optical fibers, the connection between the optical fiber devices in the laser cavity is completed by welding of the optical fiber welding machine, and the optical fiber is light in weight, soft and bendable, so that the optical fiber laser cavity is formed, is convenient to integrate in a miniaturized laser box, saves cost, and is convenient to maintain and expand.
The first 808 nm band single-mode optical pump source 11 is used for emitting 808 nm continuous pump laser, the output form is optical fiber coupling output, the single cladding neodymium-doped optical fiber 30 can generate 920nm mixed 1060-1090nm band spontaneous radiation after being excited by 808 nm continuous pump laser, the optical fiber type filter device is used for filtering or inhibiting 1060-1090nm band noise light, and the 920nm weak signal filter device is used for filtering the weaker part of 920nm signal light.
The optical fiber coupler 60 guides 920nm signal light with a certain energy proportion (such as 90%) into the first output end and enters the first 808/920 nm optical fiber wavelength division multiplexer 21 again to form the next ring of oscillation; while the remaining portion (e.g., 10%) of the signal light enters the second output of the fiber coupler 60 as the output of the seed source. The energy ratio modulation can be performed according to specific use requirements, and is not described in detail herein.
Thus, in this embodiment, the laser of the first 808 nm band single-mode optical pump source 11 is input into the cavity through the first 808/920 nm fiber wavelength division multiplexer 21, after passing through the single cladding neodymium-doped fiber 30, the spontaneous radiation of the 920nm hybrid 1060-1090nm band is generated, then the weak portion of the noise light and 920nm signal light of the 1060-1090nm band is filtered or suppressed by the fiber type filter and the 920nm weak signal filter, the fiber coupler 60 outputs a portion of the light, the other portion of the light is left in the cavity of the loop-shaped fiber laser to continue oscillation, and finally, the stable optical pulse of picosecond or femtosecond level is formed after the continuous loop-around oscillation propagation, that is, the mode-locked state, so as to output the mode-locked 920nm band pulse. Compared with the prior art, the all-fiber neodymium-doped fiber laser can effectively filter out spontaneous radiation in 1060-1090nm wave bands, enables mode locking starting of 920nm wave bands to be easier, and can improve the signal-to-noise ratio of output ultrashort pulses in 920nm wave bands.
The laser of the embodiment can realize that the 920nm laser continuously oscillates in a ring-shaped optical path and outputs mode-locked pulses, and the repetition frequency of the mode-locked pulses is determined by the optical path length in the cavity.
According to different scene requirements, the laser can be made into a polarization maintaining type or a non-polarization maintaining type; the laser can be used as a seed source, and output light of the laser can be subjected to energy improvement through a later-stage optical amplifier, so that an application scene needing high energy is matched.
Referring to fig. 1, fig. 3 and fig. 4, in an embodiment of the present invention, the optical fiber filter is an 920/1060 nm wavelength division multiplexer 41, an input end of the 920/1060 nm wavelength division multiplexer 41 is connected to the other end of the single cladding neodymium-doped optical fiber, a first output end of the 920/1060 nm wavelength division multiplexer 41 is connected to the optical fiber coupler, and a second output end of the 920/1060 nm wavelength division multiplexer 41 is connected to a suspended output optical fiber or other devices capable of absorbing or transmitting 1060 nm wavelength bands, so as to filter noise light in 1060-1090nm wavelength band.
The spontaneous radiation of the 920nm mixed 1060-1090nm waveband enters from the input end of the 920/1060 nm wavelength division multiplexer 41, the signal light of the 920nm waveband is output from the first output end, and the noise light of the 1060-1090nm waveband enters the suspended output optical fiber and cannot be continuously transmitted in the cavity, so that the filtering is realized. To prevent the reflection of this band at the fiber end, the end can be cut at an 8 ° bevel or a 1060 nm fiber isolator can be fused.
Referring to fig. 2, in another embodiment, the optical fiber filter device is a fiber bragg grating 42.
By setting the fiber bragg grating 42 to be penetrated by only the signal light in the 920nm band, suppression of the noise light in the 1060-1090nm band can be achieved.
Referring to fig. 1 to 4, in addition, in an embodiment of the present invention, the 920nm weak signal filter includes an optical fiber circulator 51 and a reflective saturable absorber 52, a signal light input end of the optical fiber circulator 51 is connected to the other end of the single cladding neodymium-doped optical fiber 30, and a reflected light output end of the optical fiber circulator 51 is connected to an input end of the optical fiber coupler 60; the signal light output end of the optical fiber circulator 51 is connected to the reflective saturable absorber 52.
The 920nm signal light is incident on the reflective saturable absorber 52 through the signal light output end of the optical fiber circulator 51 and reflected back to the optical fiber circulator 51, and then is transmitted out from the reflected light output end. At the reflectively saturable absorber 52, the weaker part of the random 920nm signal light will be absorbed, while the stronger part will be reflected, forming a steady light pulse on the order of picoseconds or femtoseconds after the continuous ringing propagation.
In this embodiment, the reflective saturable absorber 52 is a semiconductor saturable absorber mirror or a mirror fixed with graphene, carbon nanotube or black phosphorus.
The common end of the fiber circulator 51 is an FC/PC head, and the saturable absorption mirror can be fixed by a metal heat sink with adaptive size and is tightly attached to the FC/PC head. Therefore, in the loop-back fiber laser, except one end of the saturable absorption mirror, other devices are all fiber devices, and the all-fiber laser can omit a space light path, so that performance degradation and even failure of the laser caused by performance degradation of space light path coupling due to vibration, temperature change and the like in the environment are avoided.
Of course, in other embodiments, the 920nm weak signal filter may also be an optical fiber device that retains a strong portion by transmitting and filtering a weak portion of the 920nm signal light, which is not described in detail.
Referring to fig. 3, in addition, in an embodiment of the present invention, the present invention further includes an optical fiber type dispersion management device 80, where the optical fiber type dispersion management device 80 is connected between the input end of the optical fiber coupler 60 and the output end of the 920nm weak signal filtering device.
A fiber-based dispersion management device 80 is added to provide anomalous dispersion to compensate or partially compensate for normal dispersion in the seed source cavity. The fiber dispersion management device 80 may be fused to the input end of the output coupler to better control the time domain width of the output pulse, or may be fused to other parts of the ring fiber laser cavity, as long as it is ensured that the peak power of the pulse signal incident on the reflective saturable absorber 52 will not cause damage to the reflective saturable absorber 52.
Referring to fig. 1 to 4, in an embodiment of the present invention, the optical fiber coupler further includes a 920nm optical fiber isolator 70, the 920nm optical fiber isolator 70 is disposed in the output optical path, and an input end of the 920nm optical fiber isolator 70 is connected to the second output end of the optical fiber coupler 60.
In this embodiment, the outputted 920nm signal light passes through the 920nm optical fiber isolator 70 and then can be connected to the amplification stage optical path, so as to be effectively amplified, thereby meeting the requirements of downstream applications.
In addition, referring to fig. 4, in an embodiment of the present invention, the optical fiber module further includes a second 808 nm band single-mode optical pump source 12 and a second 808/920 nm optical fiber wavelength division multiplexer 22, an input end of the second 808/920 nm optical fiber wavelength division multiplexer 22 is connected to the second 808 nm band single-mode optical pump source 12, and a first transmission end of the second 808/920 nm optical fiber wavelength division multiplexer 22 is connected to the other end of the single cladding neodymium-doped optical fiber 30.
Therefore, 808 nm pump light energy injected into the laser cavity can be improved, the nonlinear polarization rotation effect generated when the 920nm wave band oscillates in the optical fiber loop cavity is enhanced, and the power of the 920nm wave band in the cavity is better ensured to be above the mode locking threshold power, so that the mode locking stability of the laser and the 920nm signal light energy output are ensured.
Based on the above embodiment, the number of the single-cladding neodymium-doped optical fibers 30 is multiple, the number of the first 808 nm band single-mode optical pumping sources 11, the number of the first 808/920 nm optical fiber wavelength division multiplexer 21, the number of the second 808 nm band single-mode optical pumping sources 12, and the number of the second 808/920 nm optical fiber wavelength division multiplexer 22 are multiple, the multiple first 808 nm band single-mode optical pumping sources 11 and the first 808/920 nm optical fiber wavelength division multiplexer 21 correspond to each other one by one, the multiple second 808 nm band single-mode optical pumping sources 12 and the second 808/920 nm optical fiber wavelength division multiplexer 22 correspond to each other one by one, two ends of each single-cladding neodymium-doped optical fiber 30 respectively correspond to and are connected to the first transmission end of the first 808/920 nm optical fiber wavelength division multiplexer 21 and the first transmission end of the second 808/920 nm optical fiber wavelength division multiplexer 22, and the second transmission end of the multiple first 808/920 nm optical fiber wavelength division multiplexer 21 and the multiple second transmission ends of the second 808/920 nm optical fiber wavelength division multiplexer The second transmission end of the two 808/920 nm fiber wavelength division multiplexer 22 is connected in the loop fiber laser cavity.
Therefore, the output 920nm signal light energy can be further improved according to the needs, and specifically, the number of the single-cladding neodymium-doped optical fiber 30, the first 808 nm waveband single-mode optical pumping source 11, the first 808/920 nm optical fiber wavelength division multiplexer 21, the second 808 nm waveband single-mode optical pumping source 12 and the second 808/920 nm optical fiber wavelength division multiplexer 22 can be set according to the required 920nm signal light energy, which is not described in detail.
Based on the above embodiments, please refer to fig. 1 in combination, in the first embodiment of the present invention, the first 808 nm band single-mode optical pump source 11, the first 808/920 nm optical fiber wavelength division multiplexer 21, the single cladding neodymium-doped optical fiber 30, the 920/1060 nm wavelength division multiplexer 41, the optical fiber circulator 51, and the optical fiber coupler 60 are sequentially connected to form a loop optical fiber laser cavity, the common end of the optical fiber circulator 51 is an FC/PC head, the saturable absorber mirror can be fixed by a size-adapted metal heat sink and tightly attached to the FC/PC head, the second output end of the optical fiber coupler 60 is connected to the 920nm optical fiber isolator, and the output end of the 920nm optical fiber isolator 7 is connected to a corresponding laser amplification stage for signal amplification.
Referring to fig. 2, in addition, the present invention further provides an embodiment two, which is different from the embodiment one in that the 920/1060 nm wavelength division multiplexer 41 of the embodiment one is replaced by a fiber bragg grating 42 having a filtering performance in the 920nm band, and the fiber bragg grating can also function to filter the 1060-1090nm band noise light.
Referring to fig. 3, in the third embodiment, a dispersion management device 60 is added on the basis of the first embodiment to provide an amount of anomalous dispersion to compensate or partially compensate the normal dispersion accumulated in the ordinary silica fiber in the 920nm band.
Referring to fig. 4, in the fourth embodiment, based on the first embodiment, the two ends of the single-cladding neodymium-doped fiber 30 are respectively connected to the first 808/920 nm fiber wavelength division multiplexer 21 and the second 808/920 nm fiber wavelength division multiplexer 22, so that the pump light energy of 808 nm injected into the laser cavity is increased, and the output signal light energy of 920nm is increased, and the 920/1060 nm wavelength division multiplexer 41 is disposed between the signal light output end of the fiber circulator 51 and the saturable absorber.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. An all-fiber neodymium-doped fiber laser is characterized by comprising: the optical fiber coupling device comprises a first 808 nm waveband single-mode optical pumping source, a first 808/920 nm optical fiber wavelength division multiplexer, a single-cladding neodymium-doped optical fiber, an optical fiber type filter device, a 920nm weak signal filtering device and an optical fiber coupler; the first 808/920 nm optical fiber wavelength division multiplexer, the single cladding neodymium-doped optical fiber, the optical fiber type filter, the 920nm weak signal filtering device and the optical fiber coupler form a loop-shaped optical fiber laser cavity;
the input end of the first 808/920 nm optical fiber wavelength division multiplexer is connected to the single-mode optical pumping source with the first 808 nm waveband, and the first transmission end of the first 808/920 nm optical fiber wavelength division multiplexer is connected to one end of the single-cladding neodymium-doped optical fiber;
a first output end of the optical fiber coupler is connected to a second transmission end of the first 808/920 nm optical fiber wavelength division multiplexer, and a second output end of the optical fiber coupler is connected with an output optical path;
the optical fiber type filter device and the 920nm weak signal filtering device are connected between the other end of the single-clad neodymium-doped optical fiber and the input end of the optical fiber coupler;
the 920nm weak signal filter comprises an optical fiber circulator and a reflective saturable absorber, wherein the signal light input end of the optical fiber circulator is connected to the other end of the single-cladding neodymium-doped optical fiber, and the reflected light output end of the optical fiber circulator is connected to the input end of the optical fiber coupler; and the signal light output end of the optical fiber circulator is connected to the reflective saturable absorber.
2. The all-fiber neodymium-doped fiber laser device as claimed in claim 1, wherein the fiber filter device is an 920/1060 nm wavelength division multiplexer, an input end of the 920/1060 nm wavelength division multiplexer is connected to the other end of the single-cladding neodymium-doped fiber, a first output end of the 920/1060 nm wavelength division multiplexer is connected to the fiber coupler, and a second output end of the 920/1060 nm wavelength division multiplexer is connected to a suspended output fiber, so as to filter noise light in 1060-1090nm band.
3. The all-fiber neodymium-doped fiber laser of claim 1, wherein the fiber filter is a fiber bragg grating.
4. The all-fiber neodymium-doped fiber laser of any one of claims 1 to 3, wherein the reflective saturable absorber is a semiconductor saturable absorber mirror or a graphene, carbon nanotube or black phosphorus fixed mirror.
5. The all-fiber neodymium-doped fiber laser as claimed in any one of claims 1 to 3, further comprising a fiber dispersion management device connected between the input end of the fiber coupler and the output end of the 920nm weak signal filtering device.
6. The all-fiber neodymium-doped fiber laser device of any one of claims 1 to 3, further comprising a 920nm fiber isolator, wherein the 920nm fiber isolator is disposed on the output optical path, and an input end of the 920nm fiber isolator is connected to the second output end of the fiber coupler.
7. The all-fiber neodymium-doped fiber laser device according to any one of claims 1 to 3, further comprising a second 808 nm band single-mode optical pump source and a second 808/920 nm fiber-optic wavelength division multiplexer, wherein an input end of the second 808/920 nm fiber-optic wavelength division multiplexer is connected to the second 808 nm band single-mode optical pump source, and a first transmission end of the second 808/920 nm fiber-optic wavelength division multiplexer is connected to the other end of the single-cladding neodymium-doped fiber.
8. The all-fiber neodymium-doped fiber laser according to claim 7, wherein the number of the single-clad neodymium-doped fibers is plural, the number of the first 808 nm band single-mode optical pumping sources, the number of the first 808/920 nm fiber wavelength division multiplexer, the number of the second 808 nm band single-mode optical pumping sources and the number of the second 808/920 nm fiber wavelength division multiplexer are plural, the plural first 808 nm band single-mode optical pumping sources and the first 808/920 nm fiber wavelength division multiplexer are in one-to-one correspondence, the plural second 808 nm band single-mode optical pumping sources and the second 808/920 nm fiber wavelength division multiplexer are in one-to-one correspondence, two ends of each single-clad neodymium-doped fiber are respectively and correspondingly connected with a first transmission end of the first 808/920 nm fiber wavelength division multiplexer and a first transmission end of the second 808/920 nm fiber wavelength division multiplexer, and the second transmission ends of the plurality of first 808/920 nm optical fiber wavelength division multiplexers and the second transmission ends of the plurality of second 808/920 nm optical fiber wavelength division multiplexers are connected in the loop-shaped optical fiber laser cavity.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115685448A (en) * | 2022-10-12 | 2023-02-03 | 北京大学长三角光电科学研究院 | Wavelength division multiplexer, design method and manufacturing method thereof and optical fiber laser |
| US11817672B2 (en) * | 2019-06-25 | 2023-11-14 | Lumentum Operations Llc | Femtosecond pulse stretching fiber oscillator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701021A (en) * | 2013-12-17 | 2014-04-02 | 北京工业大学 | All-fiber pulse laser utilizing cross modulation of resonant cavities |
| CN103944048A (en) * | 2014-04-23 | 2014-07-23 | 北京大学 | Femtosecond laser device based on single cladding neodymium optical fibers and ring cavity and manufacturing method |
| CN206850211U (en) * | 2016-10-27 | 2018-01-05 | 北京工业大学 | One kind is based on 1 micron of all -fiber ultrashort pulse laser caused by dispersive wave |
| CN210926598U (en) * | 2019-07-04 | 2020-07-03 | 天津大学 | Ring-shaped cavity 1.7 mu m thulium-doped all-fiber laser |
-
2022
- 2022-03-30 CN CN202210321441.6A patent/CN114421271A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701021A (en) * | 2013-12-17 | 2014-04-02 | 北京工业大学 | All-fiber pulse laser utilizing cross modulation of resonant cavities |
| CN103944048A (en) * | 2014-04-23 | 2014-07-23 | 北京大学 | Femtosecond laser device based on single cladding neodymium optical fibers and ring cavity and manufacturing method |
| CN206850211U (en) * | 2016-10-27 | 2018-01-05 | 北京工业大学 | One kind is based on 1 micron of all -fiber ultrashort pulse laser caused by dispersive wave |
| CN210926598U (en) * | 2019-07-04 | 2020-07-03 | 天津大学 | Ring-shaped cavity 1.7 mu m thulium-doped all-fiber laser |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11817672B2 (en) * | 2019-06-25 | 2023-11-14 | Lumentum Operations Llc | Femtosecond pulse stretching fiber oscillator |
| CN115685448A (en) * | 2022-10-12 | 2023-02-03 | 北京大学长三角光电科学研究院 | Wavelength division multiplexer, design method and manufacturing method thereof and optical fiber laser |
| CN115685448B (en) * | 2022-10-12 | 2023-09-19 | 北京大学长三角光电科学研究院 | Wavelength division multiplexer, design method and manufacturing method thereof and fiber laser |
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