Preparation of chromium-doped zinc selenide nanoparticle saturable absorber and all-fiber Q-switched laser formed by same

A saturable absorption and nanoparticle technology, applied in the field of fiber laser, can solve the problems that are not suitable for building all-fiber lasers, and achieve the effect of simple operation and reduced size

Inactive Publication Date: 2019-07-26
SICHUAN UNIV
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Problems solved by technology

[0004] Chromium-doped ZnSe bulk crystals have been shown to be used as saturable absorbing devices in lasers, but they are not suitable for constructing passively modulated all-fiber lasers

Method used

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  • Preparation of chromium-doped zinc selenide nanoparticle saturable absorber and all-fiber Q-switched laser formed by same
  • Preparation of chromium-doped zinc selenide nanoparticle saturable absorber and all-fiber Q-switched laser formed by same
  • Preparation of chromium-doped zinc selenide nanoparticle saturable absorber and all-fiber Q-switched laser formed by same

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Embodiment Construction

[0020] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0021] The embodiment of the present invention demonstrates an all-fiber passive Q lasers, devices such as figure 1 As shown, semiconductor laser pump source 1, wavelength division multiplexer 2, gain fiber 3, polarization-independent isolator 4, chromium-doped zinc selenide nanoparticles-PVA film saturable absorber 5, polarization controller 6, fiber coupling Device 7 constitutes a ring laser resonator. Among them, the pump source 1 is a single-mode semiconductor laser with a center wavelength of 980 nm. The wavelength division multiplexer 2 adopts the 980 / 1550 nm wavelength division range. Gain fiber 3 is an erbium-doped fiber with an absorption of 80 dB / m at 1530 nm and a length of 30 cm. The polarization-independent isolator 4 is to ensure the unidirectional transmission of the laser during operation. The nanoparticles in the chromium-doped zinc...

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Abstract

The invention relates to a preparation of a chromium-doped zinc selenide nanoparticle saturable absorber and an all-fiber Q-switched laser formed by the same, belonging to the technical field of fiberlaser. The chromium-doped zinc selenide has a wide absorption band and a large absorption cross section in a 1.5-2.1 [mu]m wave band, has a high damage threshold and can be used as an excellent saturable absorber. The chromium-doped zinc selenide nano-particles prepared by a femtosecond laser ablation method are doped into polyvinyl alcohol or polymethyl methacrylate to prepare the film saturableabsorber. The invention also provides an annular cavity Q-switched laser adopting the saturable absorber. The annular cavity Q-switched laser comprises a wavelength division multiplexer, a gain optical fiber, an optical isolator, a polarization controller, a saturable absorber and an optical fiber coupler. The saturable absorber based on the nano particle film has the advantages of simple preparation process, low cost, easiness in integration and the like, and meanwhile, the constructed all-fiber structure laser has the advantages of compact structure, stable performance and the like, and issuitable for practical application.

Description

technical field [0001] The invention belongs to the field of optical fiber laser technology, in particular to the preparation of a chromium-doped zinc selenide nanoparticle saturable absorber and its composition Q laser. Background technique [0002] fiber optic tuning Q Lasers have the characteristics of good beam quality, high peak power, and easy integration. They play an extremely important role in the fields of optical communication, laser processing, biomedicine, optical fiber sensing, and lidar. Inserting a Saturable Absorber in the Laser Cavity for Passive Tuning Q It is a very commonly used technology. Using the saturable absorption characteristics of materials, when the light intensity is small, the transmission of the material is very small, the loss in the cavity is very large, and lasing cannot be formed. When the light intensity increases to saturate light When it is strong, the material permeates greatly, the loss in the cavity decreases, and a pulse is est...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/098
CPCH01S3/06716H01S3/1115H01S3/1118
Inventor 张弘龙凤琼冯国英
Owner SICHUAN UNIV
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