Narrow bandwidth Q-switched Erbium-doped fiber laser based on dynamic saturable absorption filtering effect

TL;DR

This paper introduces a novel narrow bandwidth Q-switched Erbium-doped fiber laser using a dynamic saturable absorption filtering effect, achieving the narrowest spectral width in FSA Q-switched fiber lasers.

Contribution

It presents a new fiber laser design with a dynamic induced grating that combines saturable absorption and spectral filtering, enabling ultra-narrow spectral bandwidths.

Findings

Achieved a spectral width of about 29.1 pm in Q-switched fiber lasers.

Demonstrated that spectral width depends on SDIG length and pump power.

Provided a simple method for narrowband Q-switched pulse generation.

Abstract

We proposed a narrow spectral bandwidth Erbium-doped fiber (EDF) laser Q-switched by a homemade saturable dynamic induced grating (SDIG) which is introduced via reforming the structure of a fiber saturable absorbers FSA with a piece of EDF and a fiber Bragg grating. The SDIG integrates both saturable absorption and spectral filtering effect simultaneously, which was confirmed through theoretical analysis and experimental results for the first time, to the best of our knowledge. Further study verified that the spectral width of the Q-switched emissions is decided by the length of the SDIG and the input power of the pump source. The Q-switched pulse with the narrowest spectral width of about 29.1 pm achieved in this work is the narrowest bandwidth pulse in the domain of the FSA Q-switched fiber lasers when the length of SDIG and pump power are 20 cm and 250 mW, respectively. Our method provides a simple way to obtain the Q-switched pulses with narrow bandwidths, which have promising applications for nonlinear frequency conversion, Doppler LIDAR and coherent beam combinations.