Semiconductor saturable absorption mirror as well as preparation method and optical fiber laser thereof

Abstract

The invention relates to a semiconductor saturable absorption mirror as well as a preparation method and an optical fiber laser thereof. The semiconductor saturable absorption mirror comprises a substrate, a reflector and an absorption layer, wherein the reflector is prepared on the substrate; the absorption layer is prepared on the reflector; the reflector is a Bragg reflector formed by a plurality of high and low refractive rate layers; the absorption layer comprises a plurality of absorption sublayers, and all the absorption sublayers and buffer layers matched with crystal lattices of the absorption sublayers interactively grow; the buffer layers are transparent semiconductor layers; and the thicknesses of the absorption sublayers are same. The semiconductor saturable absorption mirror is a high-consistency broadband high-demodulation depth semiconductor saturable absorption mirror and increases the use broadband by improving the demodulation depth consistency in the broadband range, and a locked mode is started by the semiconductor saturable absorption mirror so as to obtain stable locked mode pulse output.

Description

technical field [0001] The invention relates to the technical field of laser devices, in particular to a mode-locking device used in the field of fiber lasers and amplifiers, in particular to a semiconductor saturable absorption mirror, a preparation method thereof, and a fiber laser. Background technique [0002] Fiber lasers use semiconductor lasers as pumping light sources to generate ultrashort pulse lasers. The amplified high-energy pulses generated by fiber lasers have very important applications in industrial processing, medical and other fields. Rare-earth element Yb-doped femtosecond fiber lasers have attracted attention due to their high gain and wide wavelength band supporting ultrashort pulses. The recent application of ultrashort pulses in microprocessing and medical treatment requires stable laser pulses above 10μJ, pulse width <500fs, and repetition rate greater than 100kHz. [0003] The mode-locking of conventional fiber lasers is based on the soliton ef...

AI Technical Summary

Problems solved by technology

However, the semiconductor saturable absorber mirror with high modulation depth used for fiber laser mode locking has the problem of inconsistent modulation depth within the reflection bandwidth of the Bragg reflector, resulting in a narrow range of mode locking, and is susceptible to optical damage and short life. Shortcomings

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