High-energy mode-locked fiber laser based on chromium-silicon-tellurium saturable absorber

Abstract

The invention discloses a high-energy mode-locked fiber laser based on a chromium-silicon-tellurium saturable absorber, and relates to the technical field of fiber lasers. The implementation of the invention comprises the following steps: S1, adding 1g of chromium-silicon-tellurium nanocrystal into 60ml of 75% ethanol solution to prepare chromium-silicon-tellurium dispersion liquid; and S2, putting the mixture into an ultrasonic cleaning machine to be subjected to ultrasonic stripping for 10 h, and carrying out centrifugation for 30 min in a centrifugal machine with the rotating speed being 1500 rmp. The chromium-silicon-tellurium saturable absorber has very high nonlinear absorption performance and can cover a wide absorption area of mid-infrared visible light, the chromium-silicon-tellurium saturable absorber has the advantages of being high in stability, not prone to being oxidized and capable of achieving laser mode locking operation for a long time, chromium-silicon-tellurium is prepared through a liquid phase stripping method, the process is simple, and when in use, only the chromium-silicon-tellurium film needs to be transferred to the end face of the optical fiber connector, and the operation is convenient.

Description

technical field [0001] The invention relates to the technical field of fiber lasers, in particular to a high-energy mode-locked fiber laser based on a chromium-silicon-tellurium saturable absorber. Background technique [0002] As an important light source, fiber lasers are widely used in the technical fields of nonlinear optics, optical communications, and sensors. Fiber lasers mainly guide gain modulation through Q-switching and mode-locking to achieve pulse output. The introduction of saturated absorption mechanism or active modulation mechanism can be used respectively Realize passive or active pulse output, among them, inserting saturable absorbing material into the resonant cavity is the main way of passive Q-switching and passive mode-locking technology to generate ultrashort pulses, and passive Q-switching and passive mode-locking lasers are also used to generate high repetition Compared with active Q-switched and active mode-locked lasers, it has simple operation, h...

AI Technical Summary

Problems solved by technology

[0003] At present, saturable absorbers such as carbon nanotubes and SESAM have problems such as low damage threshold and large insertion loss, and are mainly used in solid-state lasers. Such lasers have complex structures, serious nonlinear effects, and high costs.

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