CN210517312U - 3um waveband random fiber laser based on holmium-doped fiber gain - Google Patents
3um waveband random fiber laser based on holmium-doped fiber gain Download PDFInfo
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- CN210517312U CN210517312U CN201921780567.XU CN201921780567U CN210517312U CN 210517312 U CN210517312 U CN 210517312U CN 201921780567 U CN201921780567 U CN 201921780567U CN 210517312 U CN210517312 U CN 210517312U
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Abstract
The utility model discloses a 3um waveband random fiber laser based on mix holmium fiber gain belongs to fiber laser technical field, by fiber ring mirror, fiber coupler, LD pumping laser source, optical isolator, wavelength division multiplexer that have polarization controller, mix holmium optic fibre, random phase shift fiber grating and constitute. The utility model discloses utilize random phase shift fiber grating to provide random optical feedback, utilize and mix holmium optic fibre and provide optical gain, have characteristics such as small in size, simple structure, preparation are easy, threshold power is low, conversion efficiency height.
Description
Technical Field
The utility model relates to a random fiber laser especially relates to a 3um wave band random fiber laser based on holmium-doped optical fiber gain, belongs to fiber laser technical field.
Background
Compared with the traditional laser, the random fiber laser has no fixed optical resonant cavity, most of the random laser provides random feedback by utilizing random Rayleigh scattering caused by the defect of uneven refractive index distribution introduced in the fiber drawing process, the optical feedback is realized by a multiple scattering effect in a disordered medium, and the interference effect of scattered light is utilized to generate a resonant mode with specific frequency so as to realize the random laser output. However, rayleigh scattering, which forms feedback, is weak, and even if amplification of an optical signal is achieved by the stimulated raman effect in an optical fiber, the rayleigh scattering still has disadvantages such as high laser threshold power and low conversion efficiency.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to provide a 3um waveband random fiber laser of holmium-doped fiber gain, which has the characteristics of small volume, simple structure, easy manufacture, low threshold power, high conversion efficiency and the like.
The utility model discloses a technical scheme who solves technical problem and take does:
a3 um waveband random fiber laser based on holmium-doped fiber gain comprises a fiber ring mirror (1) with a polarization controller, a fiber coupler (2), an LD pump laser source (3), an optical isolator (4), a wavelength division multiplexer (5), a holmium-doped fiber (6) and a random phase-shift fiber grating (7); one end of the optical fiber ring mirror (1) with the polarization controller is connected with one end of the optical fiber coupler (2), the other end of the optical fiber coupler (2) is connected with one port (502) of the wavelength division multiplexer (5), the LD pump laser source (3) is connected with one end of the optical isolator (4), the other end of the optical isolator (4) is connected with the second port (501) of the wavelength division multiplexer (5), the three port (503) of the wavelength division multiplexer (5) is connected with one end of the holmium-doped optical fiber (6), and the other end of the holmium-doped optical fiber (6) is connected with one end of the random phase-shifted optical fiber grating (7); the random phase-shift fiber grating (7) provides random feedback, and the generated random laser is output from the other end of the random phase-shift fiber grating (7).
The utility model has the advantages that:
1. the random phase shift fiber bragg grating is used for reflecting the pump light, and the threshold power of the laser is reduced;
2. gain feedback is provided by using the holmium-doped optical fiber, high-energy pulse laser output is obtained, and output power and conversion efficiency are improved;
drawings
The present invention will be further described with reference to the accompanying drawings and embodiments thereof.
Fig. 1 is a schematic structural diagram of a 3um band random fiber laser based on holmium-doped fiber gain.
1 is a fiber ring mirror with a polarization controller; 2 is an optical fiber coupler; 3 is LD pumping laser source; 4 is an optical isolator; 5 is a wavelength division multiplexer; 6 is holmium-doped optical fiber; and 7 is a random phase shift fiber grating.
Detailed Description
The following is a detailed description of the structure and the working principle of the present invention:
in fig. 1, a 3um band random fiber laser based on holmium-doped fiber gain comprises a fiber circulator (1) with a polarization controller, a fiber coupler (2), an LD pump laser source (3), an optical isolator (4), a wavelength division multiplexer (5), a holmium-doped fiber (6), and a random phase-shifted fiber grating (7); one end of the optical fiber circulator (1) with the polarization controller is connected with one end of the optical fiber coupler (2), the other end of the optical fiber coupler (2) is connected with one port (502) of the wavelength division multiplexer (5), the LD pump laser source (3) is connected with one end of the optical isolator (4), the other end of the optical isolator (4) is connected with the second port (501) of the wavelength division multiplexer (5), the three port (503) of the wavelength division multiplexer (5) is connected with one end of the holmium-doped optical fiber (6), and the other end of the holmium-doped optical fiber (6) is connected with one end of the random phase-shifted optical fiber grating (7); the random phase-shift fiber grating (7) provides random feedback, and the generated random laser is output from the other end of the random phase-shift fiber grating (7).
A working principle of a 3um waveband random fiber laser based on holmium-doped fiber gain is as follows:
a3 um waveband random fiber laser based on holmium-doped fiber gain is connected well according to each part shown in figure 1, 1150nm pump light output by an LD pump laser source 3 enters a wavelength division multiplexer 5 through an optical isolator 4 and then enters a holmium-doped fiber 6, holmium ions in the fiber absorb pump photons, and the population inversion occurs, so that stimulated radiation light is generated. Stimulated radiation light generated by holmium ions in the holmium-doped optical fiber 6 reaches the random phase-shift fiber grating 7, and the stimulated radiation light also returns to the optical path under the reflection of the random phase-shift fiber grating 7. The stimulated radiation light oscillates back and forth between the fiber ring mirror 1 with the polarization controller, frequency selection and mode selection are carried out, and finally obtained random laser is output from the random phase-shift fiber grating 7.
Examples
Fig. 1 is the structure schematic diagram of the utility model relates to a 3um band random fiber laser based on holmium-doped fiber gain. The fiber ring mirror 1 is provided with a polarization controller, the splitting ratio of the fiber coupler 2 is 30/70, the wavelength of the LD pump laser source 3 is 1150nm, the central wavelength of the optical isolator 4 is 1150nm, stimulated radiation light is prevented from entering the LD pump source 3 when the stimulated radiation light moves back and forth in the fiber ring mirror 1 with the polarization controller, the optical coupler 2 and the random phase-shift fiber grating 7, the wavelength division multiplexer 5 is 1150nm/2840nm, the length of the holmium-doped fiber 6 is 2m, the random phase-shift fiber grating 7 is engraved by a single-mode fiber, the length is 6cm, and the reflectivity is 50% -95%.
One end of an optical fiber circulator 1 with a polarization controller is connected with one end of an optical fiber coupler 2, the other end of the optical fiber coupler 2 is connected with one port (502) of a wavelength division multiplexer 5, an LD pump laser source 3 with the wavelength of 1150nm is connected with one end of an optical isolator 4, the other end of the optical isolator 4 is connected with a second port (501) of the wavelength division multiplexer 5, and then enters a holmium-doped optical fiber 6 with the wavelength of 2m through a third port (503) of the wavelength division multiplexer 5, holmium ions in the optical fiber are excited to be in an excited state under the action of pump light with the wavelength of 1150nm, and an amplification effect can be generated on optical signals in the optical fiber. Stimulated emission light generated by holmium ions in the holmium-doped optical fiber 6 of 2m reaches the random phase-shift fiber grating 7, and is returned to an optical path under the reflection of the random phase-shift fiber grating 7. The stimulated radiation light oscillates back and forth between the random phase shift fiber grating 7, the fiber ring mirror 1 with the polarization controller and the optical coupler 2, frequency selection and mode selection are carried out, and finally the obtained random laser with the center wavelength of 2840nm is output from the random phase shift fiber grating 7.
The above embodiment is only one of the preferred schemes in all schemes of the utility model, and other simple changes to a 3um band random fiber laser structure based on holmium-doped fiber gain all belong to the protection scope of the utility model.
Claims (1)
1. A3 um waveband random fiber laser based on holmium-doped fiber gain is characterized by comprising a fiber ring mirror (1) with a polarization controller, a fiber coupler (2), an LD pump laser source (3), an optical isolator (4), a wavelength division multiplexer (5), a holmium-doped fiber (6) and a random phase-shift fiber grating (7); one end of the optical fiber ring mirror (1) with the polarization controller is connected with one end of the optical fiber coupler (2), the other end of the optical fiber coupler (2) is connected with one port (502) of the wavelength division multiplexer (5), the LD pump laser source (3) is connected with one end of the optical isolator (4), the other end of the optical isolator (4) is connected with the second port (501) of the wavelength division multiplexer (5), the three port (503) of the wavelength division multiplexer (5) is connected with one end of the holmium-doped optical fiber (6), and the other end of the holmium-doped optical fiber (6) is connected with one end of the random phase-shifted optical fiber grating (7); the random phase-shift fiber grating (7) provides random feedback, and the generated random laser is output from the other end of the random phase-shift fiber grating (7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921780567.XU CN210517312U (en) | 2019-10-22 | 2019-10-22 | 3um waveband random fiber laser based on holmium-doped fiber gain |
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| CN201921780567.XU CN210517312U (en) | 2019-10-22 | 2019-10-22 | 3um waveband random fiber laser based on holmium-doped fiber gain |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113140952A (en) * | 2021-04-20 | 2021-07-20 | 四川大学 | High-efficiency tunable wavelength frequency doubling system based on random fiber laser |
| CN114204387A (en) * | 2021-11-08 | 2022-03-18 | 深圳大学 | Broadband tunable mid-infrared optical fiber random laser |
-
2019
- 2019-10-22 CN CN201921780567.XU patent/CN210517312U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113140952A (en) * | 2021-04-20 | 2021-07-20 | 四川大学 | High-efficiency tunable wavelength frequency doubling system based on random fiber laser |
| CN113140952B (en) * | 2021-04-20 | 2021-12-28 | 四川大学 | High-efficiency tunable wavelength frequency doubling system based on random fiber laser |
| CN114204387A (en) * | 2021-11-08 | 2022-03-18 | 深圳大学 | Broadband tunable mid-infrared optical fiber random laser |
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Granted publication date: 20200512 Termination date: 20201022 |
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