Tunable two-micrometer pulse fiber laser device

Abstract

A tunable two-micrometer pulse fiber laser device comprises a pulse pumping source with an output tail optical fiber, a single mode passive optical fiber, a band-pass filter, an isolator and an optical fiber amplifier, wherein the pulse pumping source with the output tail optical fiber, the single mode passive optical fiber, the band-pass filter, the isolator and the optical fiber amplifier are connected along an optical path in sequence. The tunable two-micrometer pulse fiber laser device achieves tuning output of pulses with wavelengths ranging from 1810 nanometers to 2170 nanometers by changing transmission wavelengths of the band-pass filter, has the advantages of being simple and compact in structure and the like, has a wavelength tuning range wider than that in the prior art and has wide application prospects in fields such as medical treatment and optoelectronic countermeasures.

Description

technical field [0001] The invention relates to the technical field of fiber lasers, in particular to a tunable 2-micron pulse fiber laser. Background technique [0002] Due to its compact structure, high gain, single-mode operation, and good beam quality, fiber lasers have been widely used in communications, microprocessing, and other fields. Among them, the 2-micron fiber laser has good application prospects in medical treatment, radar, and photoelectric countermeasures because its output wavelength is close to the absorption peak of hydroxyl H-O. Some of these applications require the laser to output a pulse train with a certain repetition rate, which involves the pulse generation method in the fiber laser. [0003] There are four methods commonly used to realize the output pulse of fiber lasers, which are mode-locking, Q-switching, electrical modulation and gain switching. Among them, mode locking is mainly used to generate femtosecond pulses, Q-switching and electrica...

AI Technical Summary

Problems solved by technology

The method of electrical modulation cannot be applied because the directly obtained power is too low, and multi-stage amplification is required, which makes the system structure very complicated

The gain switch is difficult to obtain high-performance output due to excessive dependence on the performance of the pump source

In addition, the output wavelengths of mode-locking, Q-switching, and gain switching are difficult to tune because they are limited by the frequency selection of the resonator, which also brings difficulties to the application.

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