Mode-locked fiber laser with lead selenide quantum dots as saturable absorbers

Abstract

The invention discloses a mode-locked optical fiber laser which takes a lead selenide quantum dot as a saturable absorber. Passive mode-locked optical fiber lasers based on the saturable absorbers are applied widely and gradually, bust most of existing quantum dot saturable absorbers are blocky structures, the coupling efficiency is low and the saturable absorbers are difficult to be compatible with the otpical fiber laser. The mode-locked optical fiber laser comprises a pump source, a wavelength division multiplexer, a gain optical fiber, an output coupler, a filter, an optical fiber saturable absorber and a connection optical fiber. The optical fiber saturable absorber is composed of lead selenide quantum dot-doped glass optical fiber. The pump source is a semiconductor laser with multimode tail fibers. The gain optical fiber is a ytterbium-doped optical fiber, an erbium-doped optical fiber or a thulium-doped optical fiber. The connection optical fiber is a single-mode optical fiber. According to the mode-locked optical fiber laser, the saturable absorber has higher third-order non-linear optical effect and faster time response than those of the same-component blocky material and is compatible with the mode-locked optical fiber laser.

Description

technical field [0001] The invention belongs to the technical field of fiber lasers, and in particular relates to a mode-locked fiber laser in which lead selenide quantum dots are used as saturable absorbers. Background technique [0002] Ultrafast lasers with picosecond or femtosecond pulse output have the characteristics of high peak power and short interaction time with materials, so they are playing an increasingly important role in important fields related to people's livelihood such as advanced manufacturing, biomedicine and environmental monitoring. In addition, fiber lasers have perfect beam quality, so ultrafast fiber lasers have become the development trend of ultrafast light sources. In the ultrafast field, mode-locking technology has become the most important means to generate ultrashort pulses. Among them, active mode locking can realize the tunable pulse repetition frequency, but it needs to insert a modulator in the resonant cavity for synchronous control, an...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing quantum dot saturable absorbers adopt a block structure, which often requires lens focusing, which affects the coupling efficiency and makes it difficult to be compatible with fiber lasers

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