Micro-structure mode-locking device employing tapered optical fiber evanescent field and manufacturing technique therefor

Abstract

The invention discloses a micro-structure mode-locking device capable of saturated absorption of nanometer materials via tapered optical fiber evanescent field effects and a manufacturing technique therefor, and belongs to the field of laser technology and nonlinear optics. The micro-structure mode-locking device is a micro-structure zone which mainly consists of a common single-mode optical fiber, a capillary glass tube, a saturable absorption nanometer material, a refractive index matching liquid, and an ultraviolet glue. In the micro-structure mode-locking device, a gel solution in which the tapered optical fiber, the refractive index matching liquid and the saturable absorption nanometer material are uniformly mixed is enclosed in a capillary glass sleeve tube; both ends are sealed viaultraviolet ray glue, and finally a micro-structure mode-locking device is formed. . The principle of the micro-structure mode-locking device and the manufacturing technique is to complete the shaping of passing beams via use of nonlinear absorption effects between an evanescent field produced by a tapered optical fiber bundle waist part and the saturable absorption nanometer material. Via the whole structure of the micro-structure mode-locking device, an all optical fiber state is realized; the micro-structure mode-locking device is advantaged by simple structure, good environmental stability and little susceptibility to external pollution; industrial application can be facilitated.

Description

technical field [0001] The invention belongs to the field of microstructure optical fiber, in particular to a microstructure optical fiber device with laser pulse shaping or sensing. Background technique [0002] In the development of modern laser technology and optical fiber sensing industry, the research on all-fiber devices has been paid more and more attention by scientific researchers and people in the optoelectronic industry. Among them, the microstructure mode-locking device combined with fused tapered fiber and saturable absorbing material is one of the important ways to realize all-fiber mode-locking. Beam shaping is achieved through the nonlinear absorption between the evanescent field generated on the surface of the tapered fiber and the saturable absorbing material. Compared with the previous "sandwich" structure and reflective structure, it has low insertion loss, high damage threshold and can realize all-fiber Features. [0003] The basic method of fusion tap...

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Problems solved by technology

In the previous combination methods: 1) The optical tweezers effect is used to adsorb the saturable absorbing material to the surface of the tapered optical fiber cone waist to interact with the evanescent field, but because the size of the cone waist and the saturable absorbing material are both in the micron or nanometer 2) The surface of the tapered optical fiber is directly covered with a film of saturable absorbing material with different layers of the substrate, but the saturable absorbing material

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