Intermediate infrared lumen Raman passive Q regulating pulse optical fiber laser

Abstract

The invention relates to an intermediate infrared lumen Raman passive Q regulating pulse optical fiber laser. The intermediate infrared lumen Raman passive Q regulating pulse optical fiber laser comprises a pump laser, a coupling lens group, a reflector, a double-clad ZBLAN (fluoride) optical fiber, an optical fiber welding point and a passive ZBLAN Raman optical fiber, wherein the pump laser, the coupling lens group and the reflector are sequentially connected, and an FBG0 (Fiber Bragg Grating), an FBGn, an FBGnout and multi groups of FBG pairs FBG(m-1) are distributed on the passive ZBLAN Raman optical fiber. The intermediate infrared lumen Raman passive Q regulating pulse optical fiber laser disclosed by the invention has the beneficial effects that in the traditional method for actively regulating Q by adopting the gain modulation and an AOM (Acoustic Optical Modulator), the problems of easiness in damaging the pump laser and an optical fiber end surface as a pump light needs to be modulated, and complicated structure, large size and bad flexibility of an optical fiber laser due to the use of an optical fiber external AOM are avoided.

Description

technical field [0001] The invention belongs to the field of laser technology, in particular to a mid-infrared inner cavity Raman passive Q-switched pulse fiber laser. Background technique [0002] Fiber lasers have significant advantages such as low laser threshold, good output beam quality, high conversion efficiency, high "surface area / volume" ratio, good flexibility and flexibility, and easy integration. Mid-infrared pulsed lasers are used in national defense (laser countermeasures), There are important applications in medicine (laser microtherapy) and atmospheric communication, so the development of mid-infrared pulsed fiber lasers has important scientific significance and application value. [0003] In the recent research on mid-infrared pulsed fiber lasers, the main methods used are gain modulation and active Q-switching of acousto-optic modulators. The gain modulation method periodically modulates the number of particles in the upper energy level of the laser transi...

AI Technical Summary

Problems solved by technology

Among these two methods, the former requires pulse modulation of the pump light, which is easy to damage the pump laser and the end face of the fiber; the latter requires an acousto-optic modulator outside the fiber, which makes the fiber laser lose its inherent flexibility, compactness, and volume. In addition, the acousto-optic modulator in the mid-infrared band requires special materials, which also increases the difficulty and cost of its production

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