CN106532416B - High-power long-band all-fiber single-frequency laser structure - Google Patents

High-power long-band all-fiber single-frequency laser structure Download PDF

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CN106532416B
CN106532416B CN201611268330.4A CN201611268330A CN106532416B CN 106532416 B CN106532416 B CN 106532416B CN 201611268330 A CN201611268330 A CN 201611268330A CN 106532416 B CN106532416 B CN 106532416B
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gain
output
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CN106532416A (en
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陈达如
强则煊
郁张维
王悦辉
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Zhejiang Normal University CJNU
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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
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)

Abstract

The invention discloses a high-power long-wave-band all-fiber single-frequency laser structure. The signal end of the pump beam combiner is plated with a dichroic medium film; the output port of the semiconductor laser is connected with the pumping port; the output port of the pump beam combiner is connected with one end of the double-cladding erbium-ytterbium co-doped fiber; the other port of the double-cladding erbium-ytterbium co-doped fiber is connected with one port of the first fiber grating; the other port of the first fiber bragg grating is obliquely cut into 8 degrees, so that end face reflection is not generated; the signal end plated with the dichroic dielectric film is welded with one end of the high-gain phosphate optical fiber; the other end of the high-gain phosphate optical fiber is connected with one end of the second fiber grating; the other end of one end of the second fiber bragg grating is connected with the public end of the wavelength division multiplexer. The invention improves the pump conversion efficiency by utilizing the inter-band pump, adopts the dichromatic dielectric film to improve the length of the gain optical fiber and realizes high gain by the high-doped phosphate optical fiber, and has the advantages of low price, compact structure, high output power and the like.

Description

High-power long-band all-fiber single-frequency laser structure
Technical Field
The invention belongs to the technical field of fiber lasers, and particularly relates to a miniaturized structure of a high-power long-band all-fiber single-frequency laser based on interband pumping.
Background
The single-frequency fiber laser refers to a fiber laser with only one longitudinal mode oscillation in a resonant cavity. The output spectrum has very narrow line width and quite good coherence property, and the coherence length can reach hundreds of kilometers, so that the method has great and strong demands on ultra-high precision and ultra-long distance detection. Typically, single frequency fiber lasers have a linear cavity structure, a ring cavity structure, and a composite cavity structure. The composite cavity structure fiber laser is a deformation of a linear cavity structure or a combination of a linear cavity and an annular cavity structure. Thus, it can be said that the linear cavity structure and the annular cavity structure are the most basic two structures for realizing a single-frequency laser. At present, the linear cavity adopts a single-mode fiber core pumping mode, the coupling efficiency is low, and the coupling efficiency is limited by the fact that the single-mode semiconductor pumping source cannot exceed 1 watt of power, and watt level or even higher power output cannot be directly realized. The annular cavity and the composite cavity have longer cavity length, complex structure, easy occurrence of mode jump, poor stability and serious deficiency of output power. On the other hand, the gain fiber has a certain gain spectrum width, the long wave band generally works at the tail part of the gain, and the power conversion efficiency is low. Gain fibers over many meters are typically required for long wavelength bands. Increasing the length of the fiber fails to meet the single longitudinal mode limitations.
Disclosure of Invention
The invention provides a miniaturized linear cavity structure of a high-power long-band all-fiber single-frequency laser based on inter-band pumping, aiming at the defects of the prior art.
In order to solve the technical problems, the invention adopts the following technical means:
the invention comprises 1535/1590nm dichroic medium film, pump beam combiner, high power multimode 976nm semiconductor laser, double-clad erbium ytterbium co-doped fiber, first fiber grating with high reflectivity band-to-band reflection wavelength, high gain phosphate fiber, second fiber grating with low reflectivity output laser wavelength, 1535/1590nm wavelength division multiplexer and output fiber isolator.
The signal end of the pump beam combiner is plated with a dichroic medium film; the output port of the semiconductor laser is connected with the pumping port of the pumping beam combiner; the output port of the pump beam combiner is connected with one end of the double-cladding erbium-ytterbium co-doped fiber; the other port of the double-cladding erbium-ytterbium co-doped fiber is connected with one port of the first fiber grating; the other port of the first fiber bragg grating is obliquely cut into 8 degrees, so that end face reflection is not generated, and the end face is coated with high-refractive index matching liquid to filter out the rest 976nm pump light; the signal end plated with the dichroic dielectric film is welded with one end of the high-gain phosphate optical fiber; the other end of the high-gain phosphate optical fiber is connected with one end of the second fiber grating; the other end of one end of the second fiber bragg grating is connected with the public end of the wavelength division multiplexer, and the 1535nm output arm of the wavelength division multiplexer is beveled to form 8 degrees, so that end face reflection is not generated; the 1590nm output arm of the wavelength division multiplexer is connected with the output optical fiber isolator.
The invention is mainly suitable for obtaining a high-power long-band all-fiber single-frequency fiber laser, utilizes the inter-band pumping to improve the pumping conversion efficiency, adopts the dichroic dielectric film to improve the length of the gain fiber and the high-doped phosphate fiber to realize high gain, and has the advantages of low price, compact structure, high output power and the like.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
As shown in fig. 1, taking the long-band erbium-doped fiber as an example, the scheme is equally applicable to the long-band application of other doped fibers. The device for realizing the high-power long-band erbium-doped all-fiber single-frequency fiber laser comprises a 1535/1590nm dichroic medium film 1, a pump beam combiner 2, a high-power (10W) multimode 976nm semiconductor laser 3, a double-cladding erbium-ytterbium co-doped fiber 4 with the length of L1 (2-5 m), a fiber grating with high reflectivity and inter-band reflection wavelength (the reflectivity is 99%, the half-width is 0.2nm, the center wavelength is 1535 nm) 5, a high-gain phosphate fiber 6 with the length of L2 (2-3 cm), a fiber grating with low reflectivity and output laser wavelength (the reflectivity is 30-60%, the half-width is 0.06nm, the center wavelength is 1590 nm) 7, a 1535/1590 wavelength division multiplexer 8 and an output fiber isolator 9.
The signal end of the pump beam combiner is plated with 1535/1590nm dichroic medium film; the output port of the high-power (10W) multimode 976nm semiconductor laser is connected with the pump port of the pump beam combiner; the output port of the pump beam combiner is connected with a double-cladding erbium-ytterbium co-doped optical fiber with the length of L1 (2-5 meters); the other end of the gain fiber is connected with a fiber grating with the reflectivity of 99 percent, the half-width of 0.2nm and the center wavelength of 1535 nm; the other port of the fiber bragg grating is obliquely cut into 8 degrees, so that end face reflection is not generated, and the end face is coated with high-refractive index matching liquid to filter out the rest 976nm pump light; the output optical fiber plated with the dichroic dielectric film is welded with the high-gain phosphate optical fiber; the other end of the high-gain phosphate optical fiber is connected with a low-reflectivity narrow-band 1590nm optical fiber grating; the output end of the output grating is connected with the public end of the 1535nm/1590nm wavelength division multiplexer, and the 1535nm output arm is beveled to 8 degrees so as not to generate end surface reflection; the 1590nm output arm is connected to an output fiber isolator.
To better maintain single frequency, the package may be held in an optical box with temperature controlled feedback. The connection is obtained by a non-polarization-maintaining long-band high-power single-frequency fiber laser. If the polarization-maintaining long-wave band high-power single-frequency fiber laser is obtained, the low-reflectivity fiber grating and the output optical isolator at the output end are simply changed into the polarization-maintaining fiber grating and the polarization-maintaining optical isolator.
In summary, the invention adopts the wavelength near the gain spectrum peak of the gain fiber as the novel pumping wavelength to replace the traditional short wavelength semiconductor pumping source so as to improve the pumping conversion efficiency. The inter-band pumping source can realize single-mode pumping with more than several watts by using the double-cladding gain optical fiber and the low-cost high-power multimode semiconductor pumping source so as to effectively solve the problem that the traditional single-mode semiconductor pumping cannot burst the power limit of the watts. In order to further increase the output power of the inter-band pumping, the pumping mode can adopt reverse pumping, which is also beneficial to eliminating the influence of the residual short-wavelength pumping light on the single-frequency linear cavity. In addition, the inter-band pumping can effectively reduce the thermal effect and greatly help the frequency stabilization of the single-frequency laser.
In view of the miniaturization of the structure and the use of long-point gain fibers as much as possible while maintaining the optical length of the laser, the inter-band pump output fibers fabricated above are coated with dichroic dielectric films so as to be partially transparent to the inter-band pump wavelengths and highly reflective to the long-band laser wavelengths. As the thickness of the film is reduced greatly compared with the length of the traditional fiber grating, precious length is won for the high-gain fiber, and the pump absorption efficiency is effectively improved.
Considering that the length of the single-frequency gain optical fiber is relatively short, generally about 2 cm, the length saved by adding the two-color directional dielectric film is generally not more than 3 cm, and the high-doped phosphate optical fiber is adopted to improve the gain of a long wave band.

Claims (5)

1. The utility model provides a high-power long wave band all-fiber single frequency laser structure, includes 1535/1590nm dichroic dielectric film, pump beam combiner, high-power multimode 976nm semiconductor laser, double-deck erbium ytterbium codoped fiber, high reflectivity interband reflection wavelength's first fiber grating, high gain phosphate optic fibre, low reflectivity output laser wavelength's second fiber grating, 1535/1590nm wavelength division multiplexer and output fiber isolator, its characterized in that:
the signal end of the pump beam combiner is plated with a dichroic medium film; the output port of the semiconductor laser is connected with the pumping port of the pumping beam combiner; the output port of the pump beam combiner is connected with one end of the double-cladding erbium-ytterbium co-doped fiber; the other port of the double-cladding erbium-ytterbium co-doped fiber is connected with one port of the first fiber grating; the other port of the first fiber bragg grating is obliquely cut into 8 degrees, so that end face reflection is not generated, and the end face is coated with high-refractive index matching liquid to filter out the rest 976nm pump light; the signal end plated with the dichroic dielectric film is welded with one end of the high-gain phosphate optical fiber; the other end of the high-gain phosphate optical fiber is connected with one end of the second fiber grating; the other end of one end of the second fiber bragg grating is connected with the public end of the wavelength division multiplexer, and the 1535nm output arm of the wavelength division multiplexer is beveled to form 8 degrees, so that end face reflection is not generated; the 1590nm output arm of the wavelength division multiplexer is connected with the output optical fiber isolator.
2. The high power long band all-fiber single frequency laser structure of claim 1, wherein: the reflectivity of the first fiber bragg grating is 99%, the half-width is 0.2nm, and the center wavelength is 1535nm.
3. The high power long band all-fiber single frequency laser structure of claim 1, wherein: the reflectivity of the second fiber bragg grating is 30-60%, the half-width is 0.06nm, and the center wavelength is 1590nm.
4. The high power long band all-fiber single frequency laser structure of claim 1, wherein: the length of the double-cladding erbium-ytterbium co-doped optical fiber is 2-5 meters.
5. The high power long band all-fiber single frequency laser structure of claim 1, wherein: the length of the high-gain phosphate optical fiber is 2-3 cm.
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CN110571634B (en) * 2019-08-12 2021-02-12 武汉光迅科技股份有限公司 Optical signal output device and method, and storage medium
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CN113872029B (en) * 2021-09-30 2023-10-03 上海频准激光科技有限公司 Dual-wavelength single-frequency distributed feedback fiber laser and system
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