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Mode-locked fiber laser taking lead selenide quantum dot as gain medium

A fiber laser and gain medium technology, applied in lasers, phonon exciters, laser parts, etc., can solve the problem of limited radiation wavelength of mode-locked fiber lasers, and achieve convenient radiation wavelength tuning, high fluorescence quantum yield, The effect of a large fluorescence emission cross section

Inactive Publication Date: 2017-09-08
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the radiation wavelength of the existing mode-locked fiber laser is limited, and to provide a mode-locked fiber laser capable of radiating 1700nm and other special wavelength lasers with lead selenide quantum dots as the gain medium

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  • Mode-locked fiber laser taking lead selenide quantum dot as gain medium
  • Mode-locked fiber laser taking lead selenide quantum dot as gain medium

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Embodiment 1

[0026] A mode-locked fiber laser with lead selenide quantum dots as a gain medium, including a pump source 1, a wavelength division multiplexer 2, a gain fiber 3, a high reflection unit 4, a low reflection unit 5 and a modulation unit 6. The pump source 1 adopts a semiconductor laser with a wavelength of 980nm and a single-mode pigtail; the gain fiber 3 adopts a glass fiber doped with lead selenide quantum dots, and the radiation peak wavelength is 1700nm; the mass fraction of the lead selenide quantum dots in the gain fiber 3 was 5.68%. The high reflection unit 4 uses a fiber Bragg grating with a center wavelength of 1700nm and a reflectivity of 99.5%; the low reflection unit 5 uses a fiber Bragg grating with a center wavelength of 1700nm and a reflectivity of 50%. The modulation unit 6 adopts an acousto-optic modulator or graphene.

[0027] Such as figure 1 As shown, the output fiber of the pump source 1 is connected to the pump end of the wavelength division multiplexer 2...

Embodiment 2

[0029] A mode-locked fiber laser with lead selenide quantum dots as a gain medium, including a pump source 1, a wavelength division multiplexer 2, a gain fiber 3, a modulation unit 6, an output coupler 7 and an isolator 8. The pump source 1 uses a semiconductor laser with a wavelength of 980nm and a single-mode pigtail; the gain fiber 3 uses a silicate glass fiber doped with lead selenide quantum dots, and the radiation peak wavelength is 1700nm. The isolator 8 is a single-mode fiber isolator with a working wavelength range of 1690-1710 nm; the modulation unit 6 is an acousto-optic modulator or graphene. The output coupler 7 is a fiber coupler with a 1×2 structure, and the output coupling ratio is 50%.

[0030] Such as figure 2 As shown, the output fiber of the pump source 1 is connected to the pump end of the wavelength division multiplexer 2; the output end of the wavelength division multiplexer is connected to one end of the gain fiber; the other end of the gain fiber is ...

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Abstract

The invention discloses a mode-locked fiber laser taking a lead selenide quantum dot as a gain medium. An existing mode-locked fiber laser is limited by the grain medium, only can radiate a certain special wavelength and cannot radiate some special wavelengths, The mode-locked fiber laser comprises a grain fiber, a pumping source, a wavelength division multiplexer and a modulation unit, wherein the grain fiber employs glass fiber doped with the lead selenide quantum dot, the modulation unit employs an acoustic optical modulator or graphene, and the mass percent of the lead selenide quantum dot in the grain fiber accounts for 5.68%. The mode-locked fiber laser is achieved by employing two schemes, wherein a first scheme also comprises a high reflection unit and a low reflection unit, and a second scheme also comprises a pumping isolator and an output coupler. The lead selenide quantum dot is used as the gain medium of the laser, and the mode-locked fiber laser can radiate laser with the special wavelength being 1,700 nanometers by means of the characteristic of dependence of quantum dot irradiation wavelength on size and by combining the advantage of large emission cross section of the lead selenide quantum dot.

Description

technical field [0001] The invention belongs to the technical field of fiber lasers and ultrashort pulse lasers, and in particular relates to a mode-locked fiber laser with lead selenide quantum dots as a gain medium. Background technique [0002] Ultra-short pulse laser has extremely high peak power and ultra-short pulse duration, and has high application value for material processing, high-sensitivity detection, biomedicine and other fields. In recent years, with the continuous improvement of fiber manufacturing process and the rapid development of mode-locking technology, people have begun to use mode-locked fiber lasers to generate ultrashort pulse lasers with high beam quality. However, the existing mode-locked fiber lasers are limited by their gain media, and can only radiate some specific wavelengths, and are powerless to some special wavelengths. Specifically, the existing mode-locked fiber lasers use rare earth ions as the gain medium, and each rare earth ion can o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/16H01S3/067
CPCH01S3/067H01S3/06716H01S3/169
Inventor 魏凯华范姗慧赖小敏
Owner HANGZHOU DIANZI UNIV
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