CN111668688A - Three-cladding phosphorus-doped optical fiber and Raman fiber laser based on phosphorus-doped optical fiber - Google Patents

Three-cladding phosphorus-doped optical fiber and Raman fiber laser based on phosphorus-doped optical fiber Download PDF

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CN111668688A
CN111668688A CN202010648381.XA CN202010648381A CN111668688A CN 111668688 A CN111668688 A CN 111668688A CN 202010648381 A CN202010648381 A CN 202010648381A CN 111668688 A CN111668688 A CN 111668688A
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fiber
phosphorus
doped
cladding
raman
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许将明
马小雅
张扬
叶俊
李阳
黄良金
刘伟
姚天甫
杨欢
李�灿
马鹏飞
张汉伟
肖虎
冷进勇
潘志勇
周朴
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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
    • H01S3/06708—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]
    • 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
    • H01S3/06716—Fibre compositions or doping with active elements
    • 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
    • H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
    • H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
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  • Optics & Photonics (AREA)
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  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention provides a three-cladding phosphorus-doped fiber and a Raman fiber laser based on the phosphorus-doped fiber, which comprise a pumping source, a first fiber grating, a phosphorus-doped fiber, a second fiber grating and an end cap, wherein the output end of the pumping source is welded with the input end of the first fiber grating; the output end of the first fiber grating is welded with one end of the phosphorus-doped fiber; the other end of the phosphorus-doped optical fiber is welded with the input end of the second fiber bragg grating; and the output end of the second fiber bragg grating is welded with the end cap, and the Raman laser is output through the end cap. The three-cladding phosphorus-doped optical fiber comprises a fiber core, wherein the fiber core is sequentially coated with a first cladding, a second cladding and a third cladding from inside to outside, and the fiber core is doped with P2O5The first cladding layer is doped with GeO2The second cladding layer is SiO2The third cladding is a coating layer, and the refractive index gradually decreases from the fiber core, the first cladding to the second cladding from inside to outside. The invention can be used to a great extentThe thermal load is reduced, and the output brightness and power of the Raman fiber laser are further improved.

Description

Three-cladding phosphorus-doped optical fiber and Raman fiber laser based on phosphorus-doped optical fiber
Technical Field
The invention belongs to the technical field of fiber lasers, and particularly relates to a phosphorus-doped fiber and a Raman fiber laser.
Background
The optical fiber laser has extremely high research significance and application value due to the advantages of simple and compact structure, stable and reliable work, good beam quality, high efficiency and the like, and has important application in the fields of national defense industry, medical safety, optical fiber communication and the like. The Raman fiber laser based on the stimulated Raman scattering in the optical fiber has the advantages of flexible wavelength, wide gain spectrum and the like, can simultaneously realize high-power and broadband output, and gradually becomes a research hotspot in the technical field of optical fiber lasers since the invention.
Conventional raman fiber lasers couple pump light into the core of a conventional single mode fiber, primarily by core pumping techniques. However, due to the core size of the optical fiber, it is difficult to couple the pump light with higher power, and the power and brightness increase of the output raman laser is greatly limited, in which the ordinary single mode optical fiber is shown in fig. 3. Based on the difficulty of single-mode fiber in the aspect of coupling pump light, double-cladding or even triple-cladding fiber aiming at cladding pumping technology is developed, the sectional area of the fiber is greatly increased, and the injection capability of pump power is improved. In order to meet different requirements, the refractive index of one of two claddings of a common three-clad fiber close to a fiber core is lower, the design of the low refractive index of the inner cladding enables the manufacturing process of the three-clad fiber to be more complex and the drawing difficulty to be increased, and the application of the three-clad fiber in a fiber laser is greatly limited.
The conventional Raman fiber laser adopts undoped silica-based fiber or germanium-doped silica-based fiber as a gain medium, stimulated Raman scattering effect occurs when pump light is transmitted in passive fiber, the Raman gain peak shifted at 13.2THz in Raman gain spectrum is mainly utilized to provide gain, quantum loss is about 5%, the conversion efficiency of the laser is low, thermal lens and thermal mode instability are generated, and the power improvement of the Raman fiber laser is restricted.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a three-cladding phosphorus-doped optical fiber and a Raman fiber laser based on the phosphorus-doped optical fiber.
In order to achieve the technical purpose, the invention adopts the following specific technical scheme:
the invention provides a three-cladding phosphorus-doped optical fiber which comprises a fiber core, wherein the fiber core is sequentially coated with a first cladding, a second cladding and a third cladding from inside to outside, and the fiber core is doped with P2O5The first cladding layer is doped with GeO2The second cladding layer is SiO2The third cladding is a coating layer, and the refractive index gradually decreases from the fiber core, the first cladding to the second cladding from inside to outside. Compared with the common three-clad optical fiber, the manufacturing difficulty and the cost are greatly reduced. At present, no report of the three-clad optical fiber with the core doped with phosphorus element exists. The fiber core of the invention is doped with P2O5Using Raman gain peaks with smaller frequency shifts (frequency shifts) in the Raman gain spectrum of phosphorus<4THz) provides gain and outputs raman laser light with a wavelength close to that of the pump laser, and the quantum defect is reduced to about 1/3 of the conventional raman laser based on the 13.2THz raman peak.
Furthermore, the fiber core of the phosphorus-doped optical fiber is simultaneously doped with Yb2O3。
The invention also provides a Raman fiber laser based on the phosphorus-doped fiber, wherein the Raman fiber in the Raman fiber laser is a three-clad phosphorus-doped fiber.
The Raman fiber laser based on the phosphorus-doped fiber comprises a pumping source, a first fiber grating, a phosphorus-doped fiber, a second fiber grating and an end cap, wherein the output end of the pumping source is welded with the input end of the first fiber grating; the output end of the first fiber grating is welded with one end of the phosphorus-doped fiber; the other end of the phosphorus-doped optical fiber is welded with the input end of the second fiber bragg grating; and the output end of the second fiber bragg grating is welded with the end cap, and the Raman laser is output through the end cap. The fiber core of the phosphorus-doped optical fiber is doped with P2O5Using Raman gain peaks whose frequency shift in the Raman gain spectrum is smaller (frequency shift)<4THz) provides gain and outputs raman laser light having a wavelength close to that of the pump laser.
Furthermore, the three-cladding phosphorus-doped optical fiber adopted in the phosphorus-doped optical fiber-based Raman optical fiber laser comprises a fiber core, wherein the fiber core is sequentially coated with a first cladding, a second cladding and a third cladding from inside to outside, and the fiber core is doped with P2O5The first cladding layer is doped with GeO2The second cladding layer is SiO2The third cladding is a coating layer, and the refractive index gradually decreases from the fiber core, the first cladding to the second cladding from inside to outside.
Furthermore, the pumping source in the raman fiber laser based on the phosphorus-doped fiber is a fiber laser or a semiconductor laser, and the output end of the fiber laser couples the pumping light into the first cladding or the second cladding of the three-cladding phosphorus-doped fiber in a cladding pumping manner, so that the brightness and the output power of the signal light are remarkably improved while the high-power input of the pumping light is allowed, and the fiber coupling efficiency can be greatly improved.
Furthermore, in the Raman fiber laser based on the phosphorus-doped fiber, the reflectivity of the first fiber grating is greater than 95%, and the reflectivity of the second fiber grating is 4-50%.
Furthermore, the raman fiber laser based on the phosphorus-doped fiber provided by the invention has an oscillator structure formed by a pair of fiber gratings, and a plurality of grating pairs (namely, a high-reflectivity grating and a low-reflectivity grating are used in a matching way) can be used according to actual needs.
The first fiber grating and the second fiber grating can be replaced by volume Bragg gratings according to actual needs. The Raman fiber laser based on the phosphorus-doped fiber comprises a pumping source, a first volume Bragg grating, the phosphorus-doped fiber, a second volume Bragg grating and an end cap, wherein the output end of the pumping source is welded with the input end of the first volume Bragg grating; the output end of the first integral Bragg grating is welded with one end of the phosphorus-doped optical fiber; the other end of the phosphorus-doped fiber is welded with the input end of the second volume Bragg grating; and the output end of the second volume Bragg grating is welded with the end cap, and the Raman laser is output through the end cap. Furthermore, the Raman fiber laser based on the phosphorus-doped fiber, provided by the invention, has the oscillator structure formed by a pair of fiber gratings, and can be simplified into an open cavity or semi-open cavity structure according to actual needs. Furthermore, the invention provides a raman fiber laser based on a phosphorus-doped fiber, which comprises a pumping source, a wavelength division multiplexer, a first fiber grating, a phosphorus-doped fiber, a second fiber grating and an end cap, wherein the output end of the pumping source is welded with the pumping end of the wavelength division multiplexer, and the common end of the wavelength division multiplexer is welded with the input end of the first fiber grating. The output end of the first fiber grating is welded with one end of the phosphorus-doped fiber; the other end of the phosphorus-doped optical fiber is welded with the input end of the second fiber bragg grating; and the output end of the second fiber bragg grating is welded with the end cap, and the Raman laser is output through the end cap.
The invention has the following beneficial effects:
1. the invention provides a phosphorus-doped optical fiber with three claddings, the refractive index of the optical fiber is gradually reduced from the fiber core, the first cladding to the second cladding from inside to outside due to the higher refractive index of the phosphorus-doped fiber core, and compared with the common optical fiber with three claddings, the manufacturing difficulty and the cost are greatly reduced.
2. Based on the structural characteristics of the triple-clad optical fiber, the pump light is coupled into the gain optical fiber in a cladding pumping mode, the brightness and the output power of the signal light are obviously improved while the high-power injection of the pump light is allowed, and the optical fiber coupling efficiency can be greatly improved;
3. based on the Raman gain characteristic of the phosphorus-doped fiber, the invention provides gain by using a Raman gain peak (frequency shift <4THz) with smaller frequency shift on a Raman gain spectrum, outputs Raman laser with the wavelength similar to the wavelength of pump laser, and reduces the quantum loss to about 1/3 of the conventional Raman fiber laser based on the 13.2THz Raman peak.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.
Fig. 3 is a schematic structural view of a general single mode optical fiber.
Fig. 4 is a schematic structural diagram of a triple-clad phosphorus-doped raman fiber provided by the present invention.
Fig. 5 is a schematic structural diagram of embodiment 5 of the present invention.
Fig. 6 is a schematic structural diagram of embodiment 6 of the present invention.
1: a pump source; 2: a first fiber grating; 3: a phosphorus-doped optical fiber; 4: a second fiber grating; 5: an end cap; 6: a wavelength division multiplexer.
Detailed Description
In order to make the technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
referring to fig. 1, the raman fiber laser based on a phosphorus-doped fiber provided by the present embodiment includes a pump source 1, a first fiber grating 2, a phosphorus-doped fiber 3, a second fiber grating 4, and an end cap 5. The output end of the pumping source 1 is welded with the input end of the first fiber bragg grating 2; the output end of the first fiber bragg grating 2 is welded with one end of the phosphorus-doped fiber 3; the other end of the phosphorus-doped optical fiber 3 is welded with the input end of the second fiber bragg grating 4; the output end of the second fiber grating 4 is welded with the end cap 5, and the raman laser is output through the end cap 5.
The pump source 1 is a fiber laser or a semiconductor laser, and the output end of the pump source couples pump light into the first cladding or the second cladding of the phosphorus-doped fiber 3 in a cladding pumping mode.
The phosphorus-doped optical fiber 3 has a structure as shown in fig. 4, and comprises a fiber core, wherein the fiber core is sequentially coated with a first cladding, a second cladding and a third cladding from inside to outside, and the fiber core is doped with P2O5The first cladding layer is doped with GeO2The second cladding layer is SiO2The third cladding is a coating layer, and the refractive index gradually decreases from the fiber core, the first cladding to the second cladding from inside to outside.
The reflectivity of the first fiber grating 2 is greater than 95%, and the reflectivity of the second fiber grating 4 is between 4% and 50%. The first fiber grating 2 and the second fiber grating 4 may also select a plurality of grating pairs (i.e., a high-reflectivity grating and a low-reflectivity grating are used in combination) according to actual needs, or may be replaced with a volume bragg grating.
Example 2:
referring to fig. 2, the raman fiber laser based on a phosphorus-doped fiber provided by the present embodiment includes a pump source 1, a wavelength division multiplexer 6, a first fiber grating 2, a phosphorus-doped fiber 3, a second fiber grating 4, and an end cap 5. The output end of the pumping source 1 is welded with the pumping end of the wavelength division multiplexer 6, and the common end of the wavelength division multiplexer 6 is welded with the input end of the first fiber bragg grating 2; the output end of the first fiber bragg grating 2 is welded with one end of the phosphorus-doped fiber 3; the other end of the phosphorus-doped optical fiber 3 is welded with the input end of the second fiber bragg grating 4; the output end of the second fiber grating 4 is welded with the end cap 5, and the raman laser is output through the end cap 5.
The pump source 1 is a fiber laser or a semiconductor laser, and the output end of the pump source couples pump light into the first cladding or the second cladding of the phosphorus-doped fiber 3 in a cladding pumping mode.
The structure of the phosphorus-doped optical fiber 3 is shown in fig. 4 and comprises a fiber core, wherein the fiber core is sequentially coated with a first cladding, a second cladding and a third cladding from inside to outside, and the fiber core is doped with P2O5The first cladding layer is doped with GeO2The second cladding layer is SiO2The third cladding is a coating layer, and the refractive index gradually decreases from the fiber core, the first cladding to the second cladding from inside to outside.
The reflectivity of the first fiber grating 2 is greater than 95%, and the reflectivity of the second fiber grating 4 is between 4% and 50%. The first fiber grating 2 and the second fiber grating 4 may also select a plurality of grating pairs (i.e., a high-reflectivity grating and a low-reflectivity grating are used in combination) according to actual needs, or may be replaced with a volume bragg grating.
Example 3:
the phosphorus-doped optical fiber with three claddings has a structure shown in figure 4, and comprises a fiber core, wherein the fiber core is sequentially coated with a first cladding, a second cladding and a third cladding from inside to outside, and the fiber core is doped with P2O5The first cladding layer is doped with GeO2The second cladding layer is SiO2The third cladding is a coating layer, and the refractive index gradually decreases from the fiber core, the first cladding to the second cladding from inside to outside.
Currently, a common single mode fiber is shown in fig. 3. To meet different requirements, a common triple-clad fiber has a lower refractive index in one of the two claddings near the core. The design of low refractive index of the inner cladding layer enables the manufacturing process of the triple-clad optical fiber to be more complex and the drawing difficulty to be increased, and greatly limits the application of the triple-clad optical fiber in the optical fiber laser.
Example 4:
the phosphorus-doped optical fiber with three claddings has a structure shown in figure 4, and comprises a fiber core, wherein the fiber core is sequentially coated with a first cladding, a second cladding and a third cladding from inside to outside, and the fiber core is doped with P2O5And Yb2O3The first cladding layer is doped with GeO2The second cladding layer is SiO2The third cladding is a coating layer, and the refractive index gradually decreases from the fiber core, the first cladding to the second cladding from inside to outside. Wherein the phosphorus element realizes Raman gain with small frequency shift, Yb3+Active gain is achieved. The phosphorus doping is passive gain, and the Raman light is output by using a Raman gain peak with smaller frequency shift, so that the quantum loss can be reduced; ytterbium doping is an active gain, further amplifying raman light using atomic level transitions.
Raman fiber laser adopting simultaneous doping of P2O5And Yb2O3When the triple-clad Raman fiber is doped with phosphorus. Firstly, under the action of the stimulated Raman scattering effect, the Raman gain peak with smaller frequency shift in the phosphorus-doped fiber can be used for converting the pump light into the Raman light with lower quantum loss. In addition, use is made of Yb3+The energy level transition of the ions can continue to absorb the pump light and amplify the generated Raman light, thereby improving the output power of the Raman laser. Therefore, when the phosphorus-doped fiber is applied to the Raman fiber laser, the passive gain and the active gain can be combined, and the output power of the Raman fiber laser is further improved.
Example 5:
referring to fig. 5, the fully-open-cavity raman fiber laser based on the phosphorus-doped fiber provided by the present embodiment includes a pump source 1, a phosphorus-doped fiber 3 and an end cap 5. The output end of the pumping source 1 is welded with one end of the phosphorus-doped optical fiber 3; the other end of the phosphorus-doped optical fiber 3 is welded with the end cap 5, and Raman laser is output through the end cap 5.
The pump source 1 is a fiber laser or a semiconductor laser, and the output end of the pump source couples pump light into the first cladding or the second cladding of the phosphorus-doped fiber 3 in a cladding pumping mode.
The schematic structural diagram of the phosphorus-doped optical fiber 3 is shown in fig. 4, and comprises a fiber core,the fiber core is sequentially coated with a first cladding, a second cladding and a third cladding from inside to outside, and the fiber core is doped with P2O5The first cladding layer is doped with GeO2The second cladding layer is SiO2The third cladding is a coating layer, and the refractive index gradually decreases from the fiber core, the first cladding to the second cladding from inside to outside.
Example 6:
referring to fig. 6, the raman fiber laser based on the phosphorus-doped fiber and having the semi-open cavity structure provided by the present embodiment includes a pump source 1, a first fiber grating 2, a phosphorus-doped fiber 3, and an end cap 5. The output end of the pumping source 1 is welded with the input end of the first fiber bragg grating 2; the output end of the first fiber bragg grating 2 is welded with one end of the phosphorus-doped fiber 3; the other end of the phosphorus-doped optical fiber 3 is welded with the end cap 5, and Raman laser is output through the end cap 5.
The pump source 1 is a fiber laser or a semiconductor laser, and the output end of the pump source couples pump light into the first cladding or the second cladding of the phosphorus-doped fiber 3 in a cladding pumping mode.
The phosphorus-doped optical fiber 3 has a structure as shown in fig. 4, and comprises a fiber core, wherein the fiber core is sequentially coated with a first cladding, a second cladding and a third cladding from inside to outside, and the fiber core is doped with P2O5The first cladding layer is doped with GeO2The second cladding layer is SiO2The third cladding is a coating layer, and the refractive index gradually decreases from the fiber core, the first cladding to the second cladding from inside to outside.
In summary, although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (10)

1. The utility model provides a three claddings mix phosphorus optic fibre, includes the fibre core, the fibre core by inside to outside cladding in proper order has first cladding, second cladding and third cladding, its characterized in that: the core is doped with P2O5The first cladding layer is doped with GeO2Of 1 atThe two cladding layers are SiO2The third cladding is a coating layer, and the refractive index gradually decreases from the fiber core, the first cladding to the second cladding from inside to outside.
2. The triple-clad phosphor-doped optical fiber according to claim 1, wherein: yb is also doped in the fiber core2O3。
3. The Raman fiber laser based on the phosphorus-doped fiber is characterized in that: the raman fiber in the raman fiber laser is the triple-clad phosphor-doped fiber according to any one of claims 1 to 2.
4. A raman fiber laser based on a phosphorus doped fiber according to claim 3, characterized in that: the optical fiber laser comprises a pumping source, a first fiber grating, a phosphorus-doped optical fiber, a second fiber grating and an end cap, wherein the output end of the pumping source is welded with the input end of the first fiber grating; the output end of the first fiber grating is welded with one end of the phosphorus-doped fiber; the other end of the phosphorus-doped optical fiber is welded with the input end of the second fiber bragg grating; and the output end of the second fiber bragg grating is welded with the end cap, and the Raman laser is output through the end cap.
5. The phosphorus-doped fiber-based raman fiber laser of claim 4, wherein: the output end of the pump source couples pump light into the first cladding or the second cladding of the three-cladding phosphor-doped fiber in a cladding pumping mode.
6. The phosphorus-doped fiber-based raman fiber laser of claim 4, wherein: the pumping source is a fiber laser or a semiconductor laser; the reflectivity of the first fiber grating is greater than 95%, and the reflectivity of the second fiber grating is between 4% and 50%.
7. A raman fiber laser based on a phosphorus doped fiber according to claim 3, characterized in that: the laser comprises a pumping source, a first volume Bragg grating, a phosphorus-doped optical fiber, a second volume Bragg grating and an end cap, wherein the output end of the pumping source is welded with the input end of the first volume Bragg grating; the output end of the first integral Bragg grating is welded with one end of the phosphorus-doped optical fiber; the other end of the phosphorus-doped fiber is welded with the input end of the second volume Bragg grating; and the output end of the second volume Bragg grating is welded with the end cap, and the Raman laser is output through the end cap.
8. A raman fiber laser based on a phosphorus doped fiber according to claim 3, characterized in that: the device comprises a pumping source, a wavelength division multiplexer, a first fiber grating, a phosphorus-doped fiber, a second fiber grating and an end cap, wherein the output end of the pumping source is welded with the pumping end of the wavelength division multiplexer, and the common end of the wavelength division multiplexer is welded with the input end of the first fiber grating; the output end of the first fiber grating is welded with one end of the phosphorus-doped fiber; the other end of the phosphorus-doped optical fiber is welded with the input end of the second fiber bragg grating; and the output end of the second fiber bragg grating is welded with the end cap, and the Raman laser is output through the end cap.
9. A raman fiber laser based on a phosphorus doped fiber according to claim 3, characterized in that: comprises a pumping source, a phosphorus-doped optical fiber and an end cap; the output end of the pumping source is welded with one end of the phosphorus-doped optical fiber; the other end of the phosphorus-doped optical fiber is welded with the end cap, and the Raman laser is output through the end cap.
10. A raman fiber laser based on a phosphorus doped fiber according to claim 3, characterized in that: the optical fiber laser comprises a pumping source, a first fiber grating, a phosphorus-doped optical fiber and an end cap; the output end of the pumping source is welded with the input end of the first fiber bragg grating; the output end of the first fiber grating is welded with one end of the phosphorus-doped fiber; the other end of the phosphorus-doped optical fiber is welded with the end cap, and the Raman laser is output through the end cap.
CN202010648381.XA 2020-07-07 2020-07-07 Three-cladding phosphorus-doped optical fiber and Raman fiber laser based on phosphorus-doped optical fiber Pending CN111668688A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113285335A (en) * 2021-05-20 2021-08-20 深圳市铭创光电有限公司 Mixed gain semi-open cavity structure 2um optical fiber random laser
CN115347441A (en) * 2022-05-17 2022-11-15 北京工业大学 Cascaded pumping 3.5 micron all-fiber femtosecond amplifier based on frequency shift Raman solitons

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113285335A (en) * 2021-05-20 2021-08-20 深圳市铭创光电有限公司 Mixed gain semi-open cavity structure 2um optical fiber random laser
CN115347441A (en) * 2022-05-17 2022-11-15 北京工业大学 Cascaded pumping 3.5 micron all-fiber femtosecond amplifier based on frequency shift Raman solitons
CN115347441B (en) * 2022-05-17 2024-04-26 北京工业大学 Cascaded pump 3.5-micrometer all-fiber femtosecond amplifier based on frequency shift Raman solitons

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