CN111668687A - Boron-phosphorus co-doped optical fiber and Raman fiber laser based on boron-phosphorus co-doped optical fiber - Google Patents

Boron-phosphorus co-doped optical fiber and Raman fiber laser based on boron-phosphorus co-doped optical fiber Download PDF

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Publication number
CN111668687A
CN111668687A CN202010646624.6A CN202010646624A CN111668687A CN 111668687 A CN111668687 A CN 111668687A CN 202010646624 A CN202010646624 A CN 202010646624A CN 111668687 A CN111668687 A CN 111668687A
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fiber
boron
phosphorus
doped
grating
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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)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention provides a boron-phosphorus co-doped fiber and a Raman fiber laser based on the boron-phosphorus co-doped fiber, which comprise a pumping source, a first fiber grating, the boron-phosphorus co-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 boron-phosphorus co-doped fiber; the other end of the boron-phosphorus co-doped fiber is welded with the input end of the second fiber 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. Wherein the core of the boron-phosphorus co-doped fiber is doped with B2O3And P2O5. The invention can greatly reduce the heat load and improve the energy conversion efficiency, thereby further improving the brightness and the output power of the Raman fiber laser.

Description

Boron-phosphorus co-doped optical fiber and Raman fiber laser based on boron-phosphorus co-doped optical fiber
Technical Field
The invention belongs to the technical field of fiber lasers, and particularly relates to a boron-phosphorus co-doped fiber and a Raman fiber laser based on the boron-phosphorus co-doped fiber.
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.
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 power conversion efficiency of the laser is reduced, the effects of thermal lens, unstable thermal mode and the like are generated, and the power improvement of the Raman fiber laser is restricted. To solve this problem, attention has been directed to optical fibers doped with a particular element, such as phosphor-doped optical fibers. The Raman gain characteristic of the phosphorus element can greatly reduce the quantum loss of the fiber laser, but the phosphorus element faces more serious problems of gain competition and the like, and limits the performance improvement of the doped phosphor fiber laser. While boron may provide higher gain at the lower frequency shifted bosch peak, it is a better choice than phosphorus. However, due to the characteristics of boron element, when boron element is doped in the fiber core of the optical fiber, a negative refractive index is formed, the total reflection condition between the fiber core and the cladding in the optical fiber cannot be met, a stable optical waveguide structure cannot be formed, and the manufacturing process of the boron-doped optical fiber is complicated, so that the application and development of the boron-doped optical fiber in the fields of optical fiber lasers and the like are restricted for various reasons.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a boron-phosphorus co-doped fiber and a Raman fiber laser based on the boron-phosphorus co-doped fiber, which can greatly reduce the thermal load and improve the energy conversion efficiency, thereby further improving the output power of the Raman fiber laser.
In order to achieve the technical purpose, the invention adopts the following specific technical scheme:
the invention provides a boron-phosphorus co-doped optical fiber, the fiber core of which is doped with B2O3And P2O5. At present, no report exists on an optical fiber with a core doped with boron and phosphorus simultaneously. Fiber core doping B of the invention2O3And P2O5The phosphorus element can improve the refractive index of the fiber core, so that the interior of the optical fiber meets the total reflection condition between the fiber core and the cladding, and a stable optical waveguide structure is formed; simultaneous use of boronThe Raman gain peak with smaller frequency shift in the element Raman gain spectrum provides gain, the Raman laser with the wavelength close to the wavelength of the pump laser is output, the heat load is greatly reduced, the energy conversion efficiency of the laser is improved, and the output power of the Raman fiber laser is improved.
The invention provides a Raman fiber laser based on a boron-phosphorus co-doped fiber, wherein the Raman fiber in the Raman fiber laser is the boron-phosphorus co-doped fiber, and the fiber core of the boron-phosphorus co-doped fiber is doped with B2O3And P2O5. The Raman fiber is a boron-phosphorus co-doped fiber, wherein phosphorus can improve the refractive index of the fiber core, so that the interior of the fiber meets the total reflection condition between the fiber core and the cladding, and a stable optical waveguide structure is formed; meanwhile, a Raman gain peak with smaller frequency shift in a boron Raman gain spectrum is used for providing gain, Raman laser with the wavelength close to that of the pump laser is output, the heat load is greatly reduced, the energy conversion efficiency of the laser is improved, and the output power of the Raman fiber laser is improved.
The Raman fiber laser based on the boron-phosphorus co-doped fiber comprises a pumping source, a first fiber grating, the boron-phosphorus co-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 boron-phosphorus co-doped fiber; the other end of the boron-phosphorus co-doped fiber is welded with the input end of the second fiber 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.
Further, in the raman fiber laser based on the boron-phosphorus co-doped fiber, the pump source is a fiber laser or a semiconductor laser.
Further, in the raman fiber laser based on the boron-phosphorus co-doped fiber, the boron-phosphorus co-doped fiber can be selected from a single mode fiber, a double-clad fiber or a multi-clad fiber according to actual needs.
Furthermore, in the Raman fiber laser based on the boron-phosphorus co-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, in the raman fiber laser based on the boron-phosphorus co-doped fiber, the oscillator structure formed by a pair of fiber gratings can use a plurality of grating pairs (namely, a high-reflectivity grating and a low-reflectivity grating are used in combination) 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 boron-phosphorus co-doped fiber comprises a pumping source, a first volume Bragg grating, the boron-phosphorus co-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 integrated Bragg grating is welded with one end of the boron-phosphorus co-doped optical fiber; the other end of the boron-phosphorus co-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. The reflectivity of the first volume Bragg grating is more than 95%, and the reflectivity of the second volume Bragg grating is between 4% and 50%.
Furthermore, the Raman fiber laser based on the boron-phosphorus co-doped fiber provided by the invention has the advantage that the oscillator structure formed by a pair of fiber gratings can be simplified into an open cavity or semi-open cavity structure according to actual needs. Specifically, a Raman fiber laser based on a boron-phosphorus co-doped fiber is provided, and is of a full-open cavity structure; which includes a pump source, a boron-phosphorus co-doped fiber, and an end cap. The output end of the pumping source is welded with one end of the boron-phosphorus co-doped fiber; the other end of the boron-phosphorus co-doped optical fiber is welded with the end cap, and Raman laser is output through the end cap. In addition, the Raman fiber laser based on the boron-phosphorus co-doped fiber is of a semi-open cavity structure and comprises a pumping source, a first fiber grating, the boron-phosphorus co-doped 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 boron-phosphorus co-doped fiber; the other end of the boron-phosphorus co-doped fiber is welded with the end cap, and Raman laser is output through the end cap.
Furthermore, the invention provides a Raman fiber laser based on a boron-phosphorus co-doped fiber, which comprises a pumping source, a wavelength division multiplexer, a first fiber grating, the boron-phosphorus co-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 boron-phosphorus co-doped fiber; the other end of the boron-phosphorus co-doped fiber is welded with the input end of the second fiber 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. Similarly, the first fiber grating and the second fiber grating may use a plurality of grating pairs (i.e. high reflectivity grating + low reflectivity grating) or may be replaced by volume bragg gratings according to actual needs.
The invention has the following beneficial effects:
the invention can improve the refractive index of the fiber core based on the phosphorus element characteristic of the boron-phosphorus co-doped fiber, so that the interior of the fiber meets the total reflection condition between the fiber core and the cladding, and a stable optical waveguide structure is formed.
Based on the Raman gain characteristic of the boron-phosphorus co-doped fiber, the Raman gain peak with smaller frequency shift in the boron Raman gain spectrum is used for providing gain, the Raman laser with the wavelength close to the wavelength of the pump laser is output, the thermal load is greatly reduced, the energy conversion efficiency is improved, and the output power of the Raman fiber laser is improved.
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 cross-sectional view of a boron-phosphorus co-doped single-mode optical fiber and its refractive index profile.
Fig. 4 is a schematic structural diagram of embodiment 3 of the present invention.
Fig. 5 is a schematic structural diagram of embodiment 4 of the present invention.
1: a pump source; 2: a first fiber grating; 3: boron-phosphorus co-doped optical fibers; 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 boron-phosphorus co-doped fiber provided by the present embodiment includes a pump source 1, a first fiber grating 2, a boron-phosphorus co-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 boron-phosphorus co-doped fiber 3; the other end of the boron-phosphorus co-doped fiber 3 is welded with the input end of the second fiber 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 pumping source 1 is a fiber laser or a semiconductor laser.
The structure of the boron-phosphorus co-doped optical fiber 3 is schematically shown in FIG. 3, and the core of the boron-phosphorus co-doped optical fiber is doped with B2O3And P2O5According to actual needs, single mode optical fiber, double-clad optical fiber or multi-clad optical fiber can be selected.
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 use a plurality of grating pairs (i.e. a high-reflectivity grating and a low-reflectivity grating) or may be replaced by a volume bragg grating according to actual needs.
Example 2:
referring to fig. 2, the raman fiber laser based on a boron-phosphorus co-doped fiber provided by the present embodiment includes a pump source 1, a wavelength division multiplexer 6, a first fiber grating 2, a boron-phosphorus co-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 boron-phosphorus co-doped fiber 3; the other end of the boron-phosphorus co-doped fiber 3 is welded with the input end of the second fiber 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 pumping source 1 is a fiber laser or a semiconductor laser.
The structure of the boron-phosphorus co-doped optical fiber 3 is schematically shown in FIG. 3, and the core of the boron-phosphorus co-doped optical fiber is doped with B2O3And P2O5According to actual needs, single mode optical fiber, double-clad optical fiber or multi-clad optical fiber can be selected.
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 use a plurality of grating pairs (i.e. a high-reflectivity grating and a low-reflectivity grating) or may be replaced by a volume bragg grating according to actual needs.
Example 3:
referring to fig. 4, the raman fiber laser based on the boron-phosphorus co-doped fiber provided in this embodiment is a fully open cavity structure. It comprises a pump source 1, a boron-phosphorus co-doped fiber 3 and an end cap 5. The output end of the pump source 1 is welded with one end of the boron-phosphorus co-doped fiber 3; the other end of the boron-phosphorus co-doped optical fiber 3 is welded with the end cap 5, and Raman laser is output through the end cap 5.
The pumping source 1 is a fiber laser or a semiconductor laser.
The structure of the boron-phosphorus co-doped optical fiber 3 is schematically shown in FIG. 3, and the core of the boron-phosphorus co-doped optical fiber is doped with B2O3And P2O5According to actual needs, single mode optical fiber, double-clad optical fiber or multi-clad optical fiber can be selected.
Example 4:
referring to fig. 5, the raman fiber laser based on a boron-phosphorus co-doped fiber provided in this embodiment is a semi-open cavity structure, and includes a pump source 1, a first fiber grating 2, a boron-phosphorus co-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 boron-phosphorus co-doped fiber 3; the other end of the boron-phosphorus co-doped optical fiber 3 is welded with the end cap 5, and Raman laser is output through the end cap 5.
The pumping source 1 is a fiber laser or a semiconductor laser.
The structure of the boron-phosphorus co-doped optical fiber 3 is schematically shown in FIG. 3, and the core of the boron-phosphorus co-doped optical fiber is doped with B2O3And P2O5According to actual needs, single mode optical fiber, double-clad optical fiber or multi-clad optical fiber can be selected.
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. Boron-phosphorus co-doped optical fiber, characterized in that its core is doped with B2O3And P2O5。
2. The Raman fiber laser based on the boron-phosphorus co-doped fiber is characterized in that the Raman fiber in the Raman laser is the boron-phosphorus co-doped fiber, and the fiber core of the boron-phosphorus co-doped fiber is doped with B2O3And P2O5。
3. The Raman fiber laser based on the boron-phosphorus co-doped fiber is characterized by comprising a pump source, a first fiber grating, the boron-phosphorus co-doped fiber, a second fiber grating and an end cap, wherein the output end of the pump 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 boron-phosphorus co-doped fiber; the other end of the boron-phosphorus co-doped fiber is welded with the input end of the second fiber 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.
4. The raman fiber laser based on a boron-phosphorus co-doped fiber according to claim 2, comprising a pump source, a wavelength division multiplexer, a first fiber grating, a boron-phosphorus co-doped fiber, a second fiber grating and an end cap, wherein an output end of the pump source is fused to a pump end of the wavelength division multiplexer, and a common end of the wavelength division multiplexer is fused to an input end of the first fiber grating. The output end of the first fiber grating is welded with one end of the boron-phosphorus co-doped fiber; the other end of the boron-phosphorus co-doped fiber is welded with the input end of the second fiber 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. A Raman fiber laser based on a boron-phosphorus co-doped fiber according to claim 3 or 4, wherein the reflectivity of the first fiber grating is > 95% and the reflectivity of the second fiber grating is between 4 and 50%.
6. The Raman fiber laser based on the boron-phosphorus co-doped fiber is characterized by comprising a pumping source, a first bulk Bragg grating, the boron-phosphorus co-doped fiber, a second bulk Bragg grating and an end cap, wherein the output end of the pumping source is welded with the input end of the first bulk Bragg grating; the output end of the first integrated Bragg grating is welded with one end of the boron-phosphorus co-doped optical fiber; the other end of the boron-phosphorus co-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.
7. A Raman fiber laser based on a boron-phosphorus co-doped fiber according to claim 6, wherein the reflectivity of said first bulk Bragg grating is > 95% and the reflectivity of said second bulk Bragg grating is between 4 and 50%.
8. A raman fiber laser based on a boron-phosphorus co-doped fiber according to claim 2, comprising a pump source, a boron-phosphorus co-doped fiber and an end cap; the output end of the pumping source is welded with one end of the boron-phosphorus co-doped fiber; the other end of the boron-phosphorus co-doped optical fiber is welded with the end cap, and Raman laser is output through the end cap.
9. The raman fiber laser based on a boron-phosphorus co-doped fiber according to claim 2, comprising a pump source, a first fiber grating, a boron-phosphorus co-doped 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 boron-phosphorus co-doped fiber; the other end of the boron-phosphorus co-doped fiber is welded with the end cap, and Raman laser is output through the end cap.
10. A raman fiber laser based on a boron-phosphorous co-doped fiber according to claim 3, 4, 6, 8 or 9, characterized in that said pump source is a fiber laser or a semiconductor laser; the boron-phosphorus co-doped optical fiber is a single-mode optical fiber, a double-clad optical fiber or a multi-clad optical fiber.
CN202010646624.6A 2020-07-07 2020-07-07 Boron-phosphorus co-doped optical fiber and Raman fiber laser based on boron-phosphorus co-doped optical fiber Pending CN111668687A (en)

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