1.7 micron picosecond ultrafast fiber laser based on SESAM

Abstract

The invention discloses a 1.7 micron picosecond ultrafast fiber laser based on an SESAM. The structure of the 1.7 micron picosecond ultrafast fiber laser is mainly composed of a laser pumping source, a wavelength division multiplexer, a thulium-doped silica fiber, a polarization independent isolator, a first optical fiber band-pass filter, a second optical fiber band-pass filter, a circulator, the SESAM, an optical fiber coupler, a polarization controller and a common single-mode fiber which are sequentially arranged. The fiber laser can realize stable picosecond pulse fiber laser output of 1.7 [mu]m wave band. The laser is of an all-fiber integrated structure, is simple and compact in structure, convenient to use and extremely low in development cost, and has excellent application prospects in the fields of advanced polymer laser manufacturing, laser operation and the like in the future.

Description

Technical field [0001] The present invention relates to the field of fiber lasers, and more particularly to a 1.7 micrometer-wave fiber laser. Background technique [0002] The 1.7μm wave section has a very unique spectral position while in the strongest absorption band of the CH bond in the polymer molecule and the low valley position absorbed by the water molecule, which makes the band ultra-short pulse laser light source in the polymer advanced laser manufacturing, optical coherence Chromatography Imaging, laser surgery, polymer cutting and welding, multi-photon microscopic and many other fields have broad application prospects and excellent application value. [0003] Piscond pulse lasers are especially suitable for the above-mentioned application scenarios because of the characteristics of ultra-short pulse, ultra-peak power. Therefore, how to develop a high-quality picosecond laser light source at the 1.7μm wave section has become a research hotspot for researchers. [0004...

AI Technical Summary

Problems solved by technology

It has been reported that researchers based on the space-structured acousto-optic modulator have achieved gain-modulated nanosecond-level ultrashort pulse fiber laser output in this band, but because the laser structure adopts a space-coupling structure, its laser output stability is difficult. Guaranteed, and limited by the time-domain characteristics of the device, it is difficult to achieve laser output with a shorter pulse scale

In addition, there are related reports that based on bismuth-doped germanium silicate fiber, Russian researchers have realized picosecond-level mode-locked fiber laser output in this band by using nonlinear deflection efficiency, but the preparation of the gain fiber material in the laser structure is extremely difficult. Complex and expensive, and due to the long length of the nonlinear fiber, the entire laser structure is not compact and stable enough

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