Two-micron wave band impulse fiber laser based on super-continuum spectrum light source

Abstract

The invention discloses a two-micron wave band impulse fiber laser based on a super-continuum spectrum light source, aiming to provide a two-micron wave band impulse fiber laser which easily realizes ps-ns order impulse width laser and is based on the super-continuum spectrum light source. The laser disclosed by the invention consists of the super-continuum spectrum light source, a wavelength division multiplexer, a high-reflectivity fiber bragg grating, a low-reflectivity fiber bragg grating, a gain fiber and a fiber isolator. The super-continuum spectrum light source is selected as a pumping source; super-continuum spectrum light entering the gain fiber contains both pumping light and signal light which are required by the laser and through the wavelength division multiplexer; and as an initial seed laser, the signal light contained by the super-continuum spectrum is reflected and amplified in a resonant cavity, and laser output is obtained finally. According to the invention, the width of the impulse of the two-micron laser depends on pumping super-continuum spectrum light source and is not limited by the cavity length of the laser, the two-micron impulse laser with high repetition frequency can be obtained, and the structure of a system is simple and easy to realize.

Description

technical field [0001] The invention relates to a 2 μm band pulsed fiber laser, which belongs to the field of fiber laser technology, in particular to a 2 μm band pulsed fiber laser based on a gain switch and a supercontinuum light source. Background technique [0002] In recent years, pulsed fiber lasers operating in the "eye-safe" 2μm band (about 1.9-2.1μm) have attracted great interest. 2μm band pulsed fiber lasers not only have important applications in biomedicine, spectroscopy, gas remote sensing, etc., but can also be used for nonlinear wavelength conversion, such as mid-infrared supercontinuum generation and optical parametric oscillators. Common 2μm band pulsed fiber lasers include Q-switched, mode-locked and gain-switched pulsed fiber lasers. Among them, the gain-switched laser can use the 1550nm pulsed laser in the optical communication band as the pump source, which is used for the gain-switched thulium-doped fiber to realize the pulse output in the 2μm band, an...

AI Technical Summary

Problems solved by technology

However, short-cavity-length lasers require special high-doped gain fibers, which are difficult to manufacture and obtain. Based on the existing gain-switched 2μm-band pulsed fiber lasers, it is difficult to obtain pulse output in the order of ps (picosecond) to ns

On the other hand, due to the limitation of the establishment time of the upper level particle number in the gain switching technology, it is difficult to obtain a high repetition frequency pulse output during the pulse establishment process, and the repetition frequency of the obtained gain switching pulse is usually less than 1MHz

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