Method for efficient deposition of tungsten sulfide on side surface of tapered optical fiber

Abstract

A method for efficient deposition of tungsten sulfide on a side surface of a tapered optical fiber comprises steps as follows: a tungsten sulfide dispersion liquid is prepared; the tapered optical fiber is prepared from an ordinary single-mode optical fiber; an optical fiber in a tapering zone is immersed in the tungsten sulfide dispersion liquid; a laser with certain power is input from one end of the optical fiber, and output laser power changes are monitored by a laser power meter at the other end; the amount of the tungsten sulfide deposited on the side surface of the tapered optical fiber is controlled through control on the magnitude of the laser power input to the tapered optical fiber and the laser passing time. According to the method, all that is required is to use tungsten sulfide powder instead of preparing large-area tungsten sulfide materials, so that acting distances between optical fields and the tungsten sulfideare longer, more optical fields can interact with the tungsten sulfide, and the deposition speed and the deposition size of the tungsten sulfide can be significantly increased.

Description

Technical field [0001] The invention relates to a method for transferring tungsten sulfide to the side of an optical fiber, in particular to a method for efficiently depositing tungsten sulfide on the side of a tapered optical fiber. Background technique [0002] Transition metal sulfide is a kind of nanomaterial with a two-dimensional layered structure, which exhibits an adjustable band gap and rich optoelectronic properties, and is receiving more and more attention at home and abroad. As a transition metal sulfide, tungsten sulfide was confirmed to have saturated absorption characteristics in 2013 and was found to have optical nonlinearity in 2014. The experimental results of using tungsten sulfide as a saturable absorber for mode-locked lasers and Q-switched lasers have also been reported. Therefore, tungsten sulfide has broad application prospects in pulsed lasers, nonlinear optical fibers, optical signal processing and other fields. [0003] In order to enable the light fiel...

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Problems solved by technology

[0007] In short, the above methods are either expensive or not suitable for occasions that require a strong interaction between the light field and the material.

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