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All-fiber dual-wavelength pumped Thulium-doped fiber laser

A fiber laser and dual-wavelength technology, which is applied to lasers, laser components, phonon exciters, etc., can solve the problems of large quantum deficit, heavy thermal management burden, and low efficiency, and achieve small quantum deficit, lighten the burden, and absorb uniform effect

Active Publication Date: 2021-06-25
EZHOU INST OF IND TECH HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the above defects or improvement needs of the prior art, the present invention provides an all-fiber dual-wavelength pumped thulium-doped fiber laser, which aims to solve the problem that the current thulium-doped fiber laser uses a 793nm pumping method with low efficiency and large quantum deficit. Technical issues such as heavy thermal management burden

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  • All-fiber dual-wavelength pumped Thulium-doped fiber laser

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Embodiment 1

[0025] like figure 1 As shown, the present invention proposes an all-fiber dual-wavelength pumped thulium-doped fiber laser, including forward pumping sources 1, a first isolator 2, a wavelength division multiplexer 3, a thulium-doped optical fiber 4, and a first connected sequentially. A uniform fiber Bragg grating 5, a beam combiner 7, a second isolator 8, and a backward pumping source 9. The all-fiber dual-wavelength pumping thulium-doped fiber laser proposed by the present invention uses two pumping sources with different working wavelengths, which are respectively arranged at both ends of the fiber laser, so that dual-wavelength pumping in the same band can be realized, and at the same time, the thulium-doped The front and rear positions of the optical fiber absorb the pump light uniformly, which is beneficial to the thermal management of the thulium-doped optical fiber.

[0026] The forward pumping source 1 of the present invention is an integrated erbium-doped fiber la...

Embodiment 2

[0036] The difference between this embodiment and Embodiment 1 is that the fiber laser also includes a second uniform fiber Bragg grating 6 arranged between the first uniform fiber Bragg grating 5 and the beam combiner 7, the grating has no directionality, and its The central wavelength is the same as the working wavelength of the forward pump source 1, and in this embodiment, the central wavelength is 1550 nm, and the reflectivity is greater than 99%. The grating makes the unabsorbed 1550nm pump light return to the thulium-doped fiber 4 to be absorbed, which effectively improves the utilization rate of the remaining pump light. The reflectivity of the grating at the working wavelength of 1900nm of the backward pumping source is less than 10%, so that the pumping light provided by the backward pumping source can pass through.

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Abstract

The invention discloses an all-fiber dual-wavelength pumped thulium-doped fiber laser, which comprises a sequentially connected forward pumping source, a first isolator, a wavelength division multiplexer, a thulium-doped fiber, a first uniform fiber Bragg grating, a combination Beamer, second isolator, backward pumping source; the wavelength division multiplexer has three ports, which are the pump optical coupling port, the wavelength multiplexing port and the signal optical coupling output port, the first isolator and the wavelength division multiplexer The user is connected through the pump light coupling port, and the wavelength division multiplexer is connected with the thulium-doped fiber through the wavelength multiplexing port; the first uniform fiber Bragg grating and the signal light coupling output port together form a laser resonator; the first uniform fiber Bragg grating There is no directionality, the center wavelength is 2μm~2.05μm, and the reflectivity is greater than 99%. The purpose of the present invention is to solve the current technical problems of thulium-doped fiber lasers using a 793nm pumping method with low efficiency, large quantum deficit, and heavy thermal management burden.

Description

technical field [0001] The invention belongs to the field of fiber lasers, and more specifically relates to an all-fiber dual-wavelength pumped thulium-doped fiber laser. Background technique [0002] Compared with solid-state lasers, fiber lasers are small and compact, have high beam quality, good stability, and are suitable for harsh working environments. By doping different rare earth ions in the gain fiber, laser output in different bands can be realized. Thulium-doped fiber lasers work in the wavelength band that is safe for human eyes and can achieve wavelength tuning in the range of 1700-2100nm. Therefore, they have broad application prospects in the fields of sensing, space optical communication, biomedicine, and mid-infrared laser generation. Thulium ion is a quasi-three-level system with three absorption peaks at 793nm, 1212nm and 1580nm, corresponding to H 6 → 3 h 4 , 3 h 6 → 3 h 5 , 3 h 6 → 3 f 4 Three energy level transition processes. Since the man...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/094H01S3/16
CPCH01S3/06716H01S3/0675H01S3/094011H01S3/094042H01S3/1616
Inventor 李进延刘茵紫刑颖滨廖雷
Owner EZHOU INST OF IND TECH HUAZHONG UNIV OF SCI & TECH