CN114725762A - Intermediate infrared saturable absorber and all-fiber intermediate infrared pulse laser - Google Patents

Intermediate infrared saturable absorber and all-fiber intermediate infrared pulse laser Download PDF

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CN114725762A
CN114725762A CN202210360910.5A CN202210360910A CN114725762A CN 114725762 A CN114725762 A CN 114725762A CN 202210360910 A CN202210360910 A CN 202210360910A CN 114725762 A CN114725762 A CN 114725762A
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fiber
absorber
laser
main
mid
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杨林永
张斌
侯静
陈胜平
宋锐
杨未强
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National University of Defense Technology
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National University of Defense Technology
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • 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
    • H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • 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
    • H01S3/06712—Polarising fibre; Polariser
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • 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
    • H01S3/06754—Fibre amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser

Abstract

The invention provides a mid-infrared saturable absorber and an all-fiber mid-infrared pulse laser, belonging to the technical field of lasers, wherein the mid-infrared saturable absorber comprises an absorber pump source for generating absorber pump light; an absorber optical fiber having an initial active ion, the initial active ion being located at a base energy level; the absorber optical fiber is connected with the absorber pumping source and used for receiving the absorber pumping light and the laser to be modulated; under the action of absorber pump light, part of initial active ions of the absorber optical fiber are pumped from a base energy level to an excitation energy level to obtain first active ions, and laser to be modulated is modulated under the action of the first active ions. The on-line tuning of the modulation parameters can be realized by adjusting absorber pump light generated by the absorber pump source. And an all-fiber mid-infrared pulse laser is provided based on the fiber-based mid-infrared saturable absorber, so that all-fiber integration is realized, and the stability of the laser is improved.

Description

Intermediate infrared saturable absorber and all-fiber intermediate infrared pulse laser
Technical Field
The invention relates to the technical field of lasers, in particular to a mid-infrared saturable absorber and an all-fiber mid-infrared pulse laser.
Background
With the development of fiber laser technology, fiber lasers based on quartz fiber with wave bands of 1 micron, 1.5 microns and 2 microns are rapidly developed, but the quartz fiber has great transmission loss in the wave band above 2.5 microns, so the quartz fiber cannot be used for generating laser light above 2.5 microns. The mid-infrared fiber laser can be realized by using soft glass fibers (such as tellurite glass fibers, fluoride fibers, chalcogenide glass fibers and the like) with lower phonon energy. However, the mid-infrared optical fiber has the defects of brittleness (fluoride optical fiber), easiness in wetting (fluoride optical fiber), low transition temperature (tellurate glass optical fiber, fluoride optical fiber, chalcogenide glass optical fiber and the like), and the like, so that the preparation and treatment difficulty of the optical fiber is high, and the existing mid-infrared band optical fiber device, especially the mid-infrared band optical fiber-based saturable absorber is lacked. In addition, modulation parameters (such as modulation depth and the like) of all the existing non-fiber-based intermediate infrared band saturable absorbers do not have an online tunable function. This severely limits the flexibility and compactness improvement of the mid-ir pulsed laser pulse parameters. Furthermore, limited by the lack of fiber-based modulation devices, there is currently no infrared fiber-pulsed laser in all-fiber architecture.
Disclosure of Invention
The invention aims to provide a mid-infrared saturable absorber and an all-fiber mid-infrared pulse laser, wherein modulation parameters can be tuned on line, all-fiber integration can be realized, and the stability of the laser and the flexibility of output pulse parameters are improved.
In order to achieve the purpose, the invention provides the following scheme:
a mid-infrared saturable absorber disposed in a laser and receiving laser light to be modulated, the mid-infrared saturable absorber comprising:
an absorber pump source for generating absorber pump light;
an absorber optical fiber having active ions, the active ions being located at a base energy level;
the absorber optical fiber is connected with the absorber pump source and is used for receiving the absorber pump light and laser to be modulated; under the action of the absorber pump light, part of the active ions of the absorber optical fiber are pumped from a base energy level to an excited energy level to obtain first active ions, and the laser to be modulated is modulated under the action of an excited state absorption effect of the first active ions.
Optionally, the absorber fiber is a mid-infrared doped fiber.
Optionally, the mid-infrared saturable absorber further comprises:
and the absorber beam combiner is respectively connected with the absorber pumping source and the absorber optical fiber and is used for transmitting the absorber pumping light and the laser to be modulated to the absorber optical fiber.
In order to achieve the above purpose, the invention also provides the following scheme:
an all-fiber mid-infrared pulsed laser, comprising:
a main pump source for generating a main pump light;
the fiber grating pair comprises a high-reflection fiber grating and a low-reflection fiber grating; the high-reflection fiber grating is connected with the main pumping source;
the main doped optical fiber is connected with the high-reflectivity fiber grating and is provided with active ions; the active ions absorb the main pump light in the form of stimulated absorption and emit light in the form of stimulated radiation; the high-reflection fiber grating is used for frequency-selecting light emitted by the main doped fiber to obtain first frequency-selecting laser, and reflecting the first frequency-selecting laser to the main doped fiber;
the intermediate infrared saturable absorber is connected with the main doped fiber and is used for modulating light emitted by the main doped fiber to obtain modulated laser;
the low-reflection fiber grating is connected with the intermediate infrared saturable absorber, and is used for carrying out frequency selection on the modulated laser to obtain second frequency-selected laser, reflecting part of the second frequency-selected laser to the main doped fiber and transmitting and outputting the rest of the second frequency-selected laser; after the second frequency-selective laser reaches a stable state, the laser transmitted and output by the low-reflection fiber bragg grating is main laser;
the main doped fiber is also used for amplifying the first frequency-selective laser and the second frequency-selective laser in the form of stimulated radiation.
Optionally, the all-fiber mid-infrared pulse laser further includes:
and the main beam combiner is respectively connected with the main pumping source and the high-reflection fiber grating and is used for sending the main pumping light to the high-reflection fiber grating.
Optionally, the primary doped fiber is a mid-infrared doped fiber.
Optionally, the all-fiber mid-infrared pulse laser further includes:
and the cladding light filter is connected with the low-reflection fiber grating and is used for filtering main pumping light and absorber pumping light which are transmitted in the fiber cladding and are not completely absorbed.
Optionally, the all-fiber mid-infrared pulse laser has a ring cavity structure.
In order to achieve the above purpose, the invention also provides the following scheme:
an all-fiber mid-infrared pulsed laser, comprising: the device comprises a main pump source, a mid-infrared saturable absorber, a main beam combiner, a fiber grating pair and a main doped fiber;
the main pump source is used for generating main pump light;
the fiber grating pair comprises a high-reflection fiber grating and a low-reflection fiber grating;
the main beam combiner is respectively connected with the main pump source, the absorber pump source of the intermediate infrared saturable absorber and the high-reflection fiber grating; the main beam combiner is used for transmitting the main pump light and the absorber pump light to the high-reflectivity fiber grating;
the main doped fiber is connected with the high-reflectivity fiber grating, and is provided with active ions which absorb photons of the main pump light in a stimulated absorption mode and emit light in a stimulated radiation mode;
the high-reflection fiber grating is used for transmitting main pump light to a main doped fiber, carrying out frequency selection on the light emitted by the main doped fiber to obtain first frequency-selective laser, and reflecting the first frequency-selective laser to the main doped fiber;
an absorber optical fiber of the intermediate infrared saturable absorber is connected with the main doped optical fiber, and the absorber optical fiber is used for modulating light emitted by the main doped optical fiber to obtain modulated laser;
the low-reflection fiber grating is connected with the absorber optical fiber, and is used for carrying out frequency selection on the modulated laser to obtain second frequency-selective laser, reflecting part of the second frequency-selective laser to the main doped optical fiber and transmitting and outputting part of the second frequency-selective laser; after the second frequency-selective laser reaches a stable state, the laser transmitted and output by the low-reflection fiber bragg grating is main laser;
the main doped fiber is also used for amplifying the first frequency-selective laser and the second frequency-selective laser in the form of stimulated radiation.
Optionally, the all-fiber mid-infrared pulse laser further includes:
and the cladding light filter is connected with the low-reflection fiber grating and is used for filtering main pumping light and absorber pumping light which are transmitted in the fiber cladding and are not completely absorbed.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the intermediate infrared saturable absorber comprises an absorber pump source and an absorber optical fiber, the intermediate infrared saturable absorber is realized based on the excited state absorption effect of activated ions in the absorber optical fiber, and online tuning of modulation parameters can be realized by adjusting absorber pump light generated by the absorber pump source. And an all-fiber mid-infrared pulse laser is provided based on the fiber-based mid-infrared saturable absorber, so that all-fiber integration is realized, and the stability of the laser is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of the structure of an infrared saturable absorber of the present invention;
FIG. 2 is a schematic diagram of the energy levels of a fiber-based mid-IR saturable absorber;
FIG. 3 is a schematic diagram of a first structure of an all-fiber mid-IR pulse laser;
fig. 4 is a schematic diagram of a second structure of an all-fiber mid-ir pulsed laser.
Description of the symbols:
the device comprises a main pump source-1, an optical fiber-based intermediate infrared saturable absorber-2, an absorber pump source-21, an absorber beam combiner-22, an absorber optical fiber-23, a main beam combiner-3, an optical fiber grating pair-4, a high-reflection optical fiber grating-41, a low-reflection optical fiber grating-42, a main doped optical fiber-5 and a cladding light filter-6.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention aims to provide a mid-infrared saturable absorber and an all-fiber mid-infrared pulse laser, wherein the mid-infrared saturable absorber is realized based on the excited state absorption effect of active ions in an absorber fiber, and online tuning of modulation parameters can be realized by adjusting absorber pump light generated by an absorber pump source. And an all-fiber mid-infrared pulse laser is provided based on the fiber-based mid-infrared saturable absorber, so that all-fiber integration is realized, and the stability of the laser is improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in FIG. 1, the infrared saturable absorber of the present invention includes an absorber pump source 21 and an absorber fiber 23. Specifically, the mid-infrared saturable absorber is an optical fiber-based mid-infrared saturable absorber.
The absorber pump source 21 is used to generate absorber pump light.
The absorber fiber 23 has active ions at a base energy level. The absorber fiber 23 is connected to the absorber pump source 21, and the absorber fiber 23 is used for receiving the absorber pump light and the laser light to be modulated. Preferably, the absorber fiber 23 is a mid-infrared doped fiber. The absorption spectrum of the excited state absorption of the dopant ions of the absorber fiber 23 covers the wavelength λ of the laser light to be modulated3。
Under the action of the absorber pump light, part of the initial active ions of the absorber fiber 23 are pumped from a base energy level to an excited energy level to obtain first active ions, and the laser to be modulated is modulated under the action of an excited state absorption effect of the first active ions.
Further, the mid-infrared saturable absorber further includes an absorber combiner 22. The absorber combiner 22 is connected to the absorber pump source 21 and the absorber fiber 23, and the absorber combiner 22 is configured to send the absorber pump light and the laser to be modulated to the absorber fiber 23. In addition, the absorber combiner 22 may also be an absorber wavelength division multiplexer, which is specifically determined by a core pumping or cladding pumping manner.
A simplified diagram of the doping ion energy levels in the absorber fiber 23 is shown in fig. 2. The wavelength of the absorber pump light output from the absorber pump source 21 is λ2. Absorber pump light passing absorber beam combiner22 enter the absorber fiber 23 and are absorbed by some of the active ions within the absorber fiber 23. This part activates the ion from the radical energy level E1Is pumped to a first excitation level E2(as shown in process a in fig. 2).
When the first excitation level E2And a second excitation level E3The wavelength range corresponding to the transition between covers the wavelength lambda of the laser to be modulated3The absorber fiber 23 will absorb the laser light to be modulated (one at the first excitation level E)2Can absorb an ion having a wavelength lambda3As shown in process b in fig. 2).
The absorption process has the characteristic of being "saturable": the high-power laser light can "bleach (decrease the absorption rate, increase the pass rate)" the absorber fiber 23 with a low absorption rate, and the low-power laser light passes through the absorber fiber 23 with a high absorption rate by the absorber fiber 23. Therefore, when the laser light to be modulated passes through the absorber fiber 23, the laser loss of the portion with weak power in the time domain of the laser light to be modulated is large because the absorption rate is high; and the part with stronger power on the time domain of the laser to be modulated has small laser loss due to low absorptivity. The saturable absorption process can thus modulate the laser light to be modulated.
Absorber pump light lambda for adjusting absorber pump source output2Will cause the absorber fiber 23 to be pumped to the first excitation level E2The number of active ions on the absorber fiber 23 changes, which results in a change in the modulation capability of the absorber fiber 23 for the laser light to be modulated, i.e. an on-line tuning of the modulation parameters (modulation depth and/or recovery time) can be achieved.
Both ends of the optical fiber-based intermediate infrared saturable absorber 2 can be connected with other optical fibers and devices in a fusion mode, so that full optical fiber is convenient to realize, and online tuning of modulation parameters can be realized by adjusting the pumping power of the optical fiber-based intermediate infrared saturable absorber. The fiber-based intermediate infrared saturable absorber 2 is a doped fiber added with pump light, and online tuning of modulation parameters can be realized by changing the pump power of the doped fiber. Compared with the similar products, the invention has the obvious advantages of full optical fiber integration, online tuning of modulation parameters and the like.
As shown in fig. 3, the all-fiber mid-ir pulsed laser of the present invention comprises: a main pump source 1, a fiber grating pair 4, a main doped fiber 5 and the fiber-based mid-infrared saturable absorber 2.
Wherein the primary pump source 1 is used for generating primary pump light. The wavelength of the main pump light is lambda1. The main pump source 1 may be a single-wavelength pump source, or a laser with multiple wavelengths, or a combination of multiple lasers with the same or different operating wavelengths, depending on the wavelength of the main laser.
The fiber grating pair 4 includes a high-reflectivity fiber grating 41 and a low-reflectivity fiber grating 42. The high-reflectivity fiber grating 41 is connected with the main pump source 1. Specifically, the working wavelength of the fiber grating pair 4 is the dominant laser wavelength λ3I.e. the design wavelength of the laser.
The main doped fiber 5 is connected to the highly reflective fiber grating 41, and the main doped fiber 5 has active ions that absorb the main pump light in the form of stimulated absorption and emit light in the form of stimulated radiation (i.e., amplified spontaneous emission) at a range of emission wavelengths that includes a main laser wavelength. Preferably, the primary doped fiber 5 is a mid-infrared doped fiber. The emission spectrum of the doped ions of the main doped fiber 5 covers the main laser wavelength lambda3。
The high-reflectivity fiber grating 41 is configured to frequency-select light emitted by the main doped fiber to obtain a first frequency-selected laser, and reflect the first frequency-selected laser to the main doped fiber 5.
The optical fiber base intermediate infrared saturable absorber 2 is connected with the main doped optical fiber 5, and the optical fiber base intermediate infrared saturable absorber 2 is used for modulating light emitted by the main doped optical fiber to obtain modulated laser.
The low-reflection fiber grating 42 is connected with the fiber-based intermediate infrared saturable absorber 2, and the low-reflection fiber grating 42 is used for further frequency-selecting the modulated laser to obtain a second frequency-selecting laser, reflecting part of the second frequency-selecting laser to the main doped fiber 5, and transmitting and outputting part of the second frequency-selecting laser. Because the high-reflection fiber grating and the low-reflection fiber grating are matched on the working wavelength and the bandwidth, the frequency selection effects of the high-reflection fiber grating and the low-reflection fiber grating are consistent, and the laser output with specific wavelength is realized.
The light emitted by the main doped fiber 5 oscillates back and forth in the resonant cavity formed by the high fiber grating 41 and the low fiber grating 42 until the laser output by the low fiber grating 42 reaches a steady state. When the steady state is reached, the laser output by the low reflection fiber grating 42 is the main laser.
Further, the all-fiber mid-infrared pulse laser further comprises a main beam combiner 3. The main beam combiner 3 is respectively connected with the main pump source 1 and the high-reflectivity fiber grating, and the main beam combiner 3 is used for transmitting the main pump light to the high-reflectivity fiber grating. Specifically, the main beam combiner 3 is selected by a core pumping or cladding pumping method.
Further, the all-fiber mid-infrared pulse laser further includes a cladding light filter 6. The cladding light filter 6 is connected to the low-reflection fiber grating, and the cladding light filter 6 is configured to filter light in the fiber cladding. The cladding light filter 6 ensures that the laser light output from the laser does not contain cladding light components. When the laser oscillates back and forth for a certain period in the resonant cavity, the dynamic balance is finally achieved, and the stable intermediate infrared pulse laser can be output from the output end of the laser.
Under the frequency selection action of the fiber grating pair 4, the wavelength lambda3Photons go back and forth in a resonant cavity formed by the fiber grating pair 4, the photon number of the laser is continuously increased, and then the power of the laser is amplified and is modulated by the fiber-based intermediate infrared saturable absorber 2. The main pump light source continuously provides energy to the active ions in the main doped fiber 5, the active ions continuously generate stimulated radiation, and the power of the laser is continuously amplified. Meanwhile, the low-reflectivity grating in the fiber grating pair 4 continuously outputs laser to the outside of the cavity, and finally, the laser reaches dynamic balance, and the power in the cavity and the output power tend to be stable. At the moment, the laser realizes stable intermediate infrared pulse laser output.
In addition, the positions of the fiber-based mid-infrared saturable absorber 2 and the primary doped fiber 5 can be interchanged.
The all-fiber mid-infrared pulse laser can be in a ring cavity structure. When in the form of a ring cavity structure, it will be clear to those skilled in the art that the design of the cavity will be different from that of the arrangement shown in figure 3.
On the premise of not causing the mutual influence of the doped ions in the main doped fiber 5 and the absorber fiber 23, the absorber combiner 22 of the mid-infrared saturable absorber 2 in the fiber base can be eliminated, and at this time, the laser output by the absorber pump source 21 is injected into the laser from the tail fiber of the main combiner 3, as shown in fig. 4.
The all-fiber mid-infrared pulse laser of the invention comprises: a main pump source 1, the fiber-based mid-infrared saturable absorber 2, a main beam combiner 3, a fiber grating pair 4 and a main doped fiber 5.
The primary pump source 1 is used to generate primary pump light. The main pump source 1 may be a single-wavelength pump source, or a laser with multiple wavelengths, or a combination of multiple lasers with the same or different operating wavelengths, depending on the wavelength of the main laser.
The fiber grating pair 4 includes a high-reflectivity fiber grating 41 and a low-reflectivity fiber grating 42.
The main beam combiner 3 is respectively connected with the main pump source 1, the absorber pump source 21 of the fiber-based mid-infrared saturable absorber 2 and the highly reflective fiber grating 41. The main beam combiner 3 is configured to transmit the main pump light and the absorber pump light to the highly reflective fiber grating 41.
The main doped fiber 5 is connected to the highly reflective fiber grating 41, and the main doped fiber 5 has active ions that absorb the main pump light in the form of stimulated absorption and emit light (i.e., amplified spontaneous emission) in the form of stimulated emission with a range of emission wavelengths including a main laser wavelength.
The high-reflectivity fiber grating 41 is configured to perform frequency selection on the light emitted by the main doped fiber 5 to obtain a first frequency-selective laser, and reflect the first frequency-selective laser to the main doped fiber 5.
The absorber fiber 23 of the fiber-based mid-infrared saturable absorber 2 is connected with the main doped fiber 5, and the absorber fiber 23 is used for modulating light emitted by the main doped fiber to obtain modulated laser.
The low-reflection fiber grating 42 is connected with the absorber fiber 23, and the low-reflection fiber grating 42 is used for further frequency-selecting the modulated laser to obtain a second frequency-selecting laser, reflecting part of the second frequency-selecting laser to the main doped fiber 5, and transmitting and outputting part of the second frequency-selecting laser. Because the high-reflection fiber grating and the low-reflection fiber grating are matched on the working wavelength and the bandwidth, the frequency selection effects of the high-reflection fiber grating and the low-reflection fiber grating are consistent. And after the second frequency-selective laser reaches a stable state, the laser transmitted and output by the low-reflection fiber bragg grating is the main laser.
Further, the all-fiber mid-infrared pulse laser further comprises a cladding light filter 6. The cladding light filter 6 is connected to the low-reflection fiber grating 42, and the cladding light filter 6 is used for filtering out primary pumping light and absorber pumping light which are transmitted in the fiber cladding and are not completely absorbed, so as to obtain intermediate infrared pulsed laser.
The laser can also be a ring cavity structure. The positions of the absorber fiber 23 and the primary doped fiber 5 may be interchanged.
Since the fiber-based mid-infrared saturable absorber 2 is essentially a doped fiber with pump light, the whole laser can be conveniently made into a full fiber by fusion welding with other components. Therefore, the all-fiber mid-infrared pulse laser provided by the invention can realize all-fiber in the true sense, and all components are connected by fusion. In the existing intermediate infrared pulse fiber laser, the full optical fiber is not realized due to the limitation of a saturable absorber or/and other devices. Therefore, compared with the similar products, the all-fiber mid-infrared pulse laser has the advantages of obviously improved shock resistance, moisture resistance, service life, stability, reliability and compactness.
In order to better understand the solution of the present invention, the following description is given with reference to specific examples.
The main pump source is 976nm with tail fiberThe laser diode comprises a main beam combiner, a high-reflectivity fiber grating and a low-reflectivity fiber grating, wherein the main beam combiner is an optical fiber beam combiner with the working wavelength of 976nm, and the working wavelengths of the high-reflectivity fiber grating and the low-reflectivity fiber grating are the main laser wavelength lambda3The main doped fiber is erbium-doped ZBLAN (Er)3+: ZBLAN) fiber. The pump source of the absorber is a fiber laser with the working wavelength of about 1950nm, the beam combiner of the absorber is a mid-infrared wavelength division multiplexer, and the doped fiber of the absorber is a holmium-doped ZBLAN (Ho)3+: ZBLAN) fiber. Working wavelength lambda of fiber grating pair3(i.e. the main laser wavelength λ)3) Any wavelength of 2.7-3.0 μm. The laser can realize the wavelength lambda3And (4) medium infrared pulse laser output.
The output lasing wavelength of the absorber pump source may actually be between 1900-2100nm, with 1950nm being most typical.
The laser of the above embodiment is a linear cavity structure. An annular cavity structure is also possible.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the foregoing, the description is not to be taken in a limiting sense.

Claims (10)

1. A mid-infrared saturable absorber disposed in a laser and receiving laser light to be modulated, the mid-infrared saturable absorber comprising:
an absorber pump source for generating absorber pump light;
an absorber optical fiber having active ions, the active ions being located at a base energy level;
the absorber optical fiber is connected with the absorber pumping source and is used for receiving the absorber pumping light and the laser to be modulated; under the action of the absorber pump light, part of initial active ions of the absorber optical fiber are pumped from a base energy level to an excitation energy level to obtain first active ions, and the laser to be modulated is modulated under the action of the first active ions.
2. The mid-infrared saturable absorber of claim 1, wherein the absorber fiber is a mid-infrared doped fiber.
3. The mid-infrared saturable absorber of claim 1, further comprising:
and the absorber beam combiner is respectively connected with the absorber pumping source and the absorber optical fiber and is used for transmitting the absorber pumping light and the laser to be modulated to the absorber optical fiber.
4. An all-fiber mid-infrared pulse laser, comprising:
a main pump source for generating a main pump light;
the fiber grating pair comprises a high-reflection fiber grating and a low-reflection fiber grating; the high-reflection fiber grating is connected with the main pumping source;
the main doped fiber is connected with the high-reflectivity fiber grating and is provided with active ions, and the active ions absorb the main pump light in a stimulated absorption mode and emit light in a stimulated radiation mode; the high-reflection fiber grating is used for frequency-selecting light emitted by the main doped fiber to obtain first frequency-selecting laser, and reflecting the first frequency-selecting laser to the main doped fiber;
the mid-infrared saturable absorber of any one of claims 1-3, connected to the primary doped fiber, for modulating light emitted from the primary doped fiber to obtain modulated laser light;
the low-reflection fiber grating is connected with the intermediate infrared saturable absorber and is used for carrying out frequency selection on the modulated laser to obtain second frequency-selected laser, reflecting part of the second frequency-selected laser to the main doped fiber and transmitting and outputting part of the second frequency-selected laser; after the second frequency-selective laser reaches a stable state, the laser transmitted and output by the low-reflection fiber bragg grating is main laser;
the main doped fiber is also used for amplifying the first frequency-selective laser and the second frequency-selective laser in the form of stimulated radiation.
5. The all-fiber mid-ir pulsed laser of claim 4, further comprising:
and the main beam combiner is respectively connected with the main pumping source and the high-reflection fiber grating and is used for sending the main pumping light to the high-reflection fiber grating.
6. The all-fiber mid-ir pulsed laser of claim 4, wherein the primary doped fiber is a mid-ir doped fiber.
7. The all-fiber mid-ir pulsed laser of claim 4, further comprising:
and the cladding light filter is connected with the low-reflection fiber grating and is used for filtering main pumping light and absorber pumping light which are transmitted in the fiber cladding and are not completely absorbed.
8. The all-fiber mid-ir pulsed laser of claim 4, wherein said all-fiber mid-ir pulsed laser has a ring cavity structure.
9. An all-fiber mid-infrared pulse laser, comprising: a primary pump source, the mid-infrared saturable absorber of claim 1, a primary beam combiner, a fiber grating pair, and a primary doped fiber;
the main pump source is used for generating main pump light;
the fiber grating pair comprises a high-reflection fiber grating and a low-reflection fiber grating;
the main beam combiner is respectively connected with the main pump source, the absorber pump source of the intermediate infrared saturable absorber and the high-reflection fiber grating; the main beam combiner is used for transmitting the main pump light and the absorber pump light to the high-reflectivity fiber grating;
the main doped fiber is connected with the high-reflectivity fiber grating, and is provided with active ions which absorb photons of the main pump light in a stimulated absorption mode and emit light in a stimulated radiation mode;
the high-reflection fiber grating is used for transmitting main pump light to a main doped fiber, carrying out frequency selection on light emitted by active ions of the main doped fiber to obtain first frequency-selective laser, and reflecting the first frequency-selective laser to the main doped fiber;
an absorber optical fiber of the intermediate infrared saturable absorber is connected with the main doped optical fiber, and the absorber optical fiber is used for modulating light emitted by the main doped optical fiber to obtain modulated laser;
the low-reflection fiber grating is connected with the absorber optical fiber, and is used for carrying out frequency selection on the modulated laser to obtain second frequency-selective laser, reflecting part of the second frequency-selective laser to the main doped optical fiber and transmitting and outputting part of the second frequency-selective laser; after the second frequency-selective laser reaches a stable state, the laser transmitted and output by the low-reflection fiber bragg grating is main laser;
the main doped fiber is also used for amplifying the first frequency-selective laser and the second frequency-selective laser in the form of stimulated radiation.
10. The all-fiber mid-ir pulsed laser of claim 9, further comprising:
and the cladding light filter is connected with the low-reflection fiber grating and is used for filtering main pumping light and absorber pumping light which are transmitted in the fiber cladding and are not completely absorbed.
CN202210360910.5A 2022-04-07 2022-04-07 Intermediate infrared saturable absorber and all-fiber intermediate infrared pulse laser Pending CN114725762A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115000794A (en) * 2022-07-19 2022-09-02 中国科学院长春光学精密机械与物理研究所 Light-operated modulation module and pulse laser system formed by same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115000794A (en) * 2022-07-19 2022-09-02 中国科学院长春光学精密机械与物理研究所 Light-operated modulation module and pulse laser system formed by same

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