Mid-infrared pulsed laser device

Abstract

The invention discloses a mid-infrared pulsed laser device, which comprises a THETA resonant cavity. By the structural design of constructing a circular cavity, irreversible loss is introduced in inverse S-shaped feedback so as to realize one-way laser transmission in the cavity and achieve high-power 3-micron-waveband laser output; and 3-micron-waveband laser output of long / short / ultra-short pulses is achieved by introducing fluoride micro-nano fiber passive modulation devices of different parameters in a main ring.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a fiber laser. Background technique [0002] Fiber Laser (Fiber Laser) refers to a laser that uses glass fibers doped with rare earth elements (Nd3+, Er3+, Yb3+, Tm3+, etc.) It is very easy to form a high power density in the laser, causing the laser energy level of the laser working material to "reverse the number of particles". When the positive feedback loop is properly added (to form a resonant cavity), the laser oscillation output can be formed. Compared with traditional lasers, it has light-to-light conversion High efficiency, good beam quality, excellent heat dissipation, simple and compact structure and other advantages. [0003] Fiber lasers have a wide range of applications, including laser optical fiber communication, laser space long-distance communication, industrial shipbuilding, automobile manufacturing, laser engraving, laser marking, laser cutting, pr...

AI Technical Summary

Problems solved by technology

[0006] 1. Using a pair of fiber gratings written on fluoride optical fibers as the laser resonator, resulting in high system costs;

[0007] 2. Adopting the traditional linear cavity structure makes the functional scalability of the system poor, and it is difficult to achieve stable long / short / ultrashort pulse laser output through simple structural improvement, which reduces the flexibility of the system

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