Pressure characteristics of a self-Q-switched distributed Bragg reflector fiber laser.

Abstract

Based on the study of self-Q-switching of a short cavity erbium-doped distributed Bragg reflector (DBR) fiber laser in time domain, the influence of pressure disturbance on the self-Q-switched output is analyzed. In the experiment, the erbium-doped DBR fiber laser (EDFL) was encapsulated with epoxy resin and curing agent to protect and sensitize the fiber. The EDFL sends out self-Q-switched laser pulses when the pump power of the 980nm laser source is more than 110mW. The external pressure is exerted on the DBR fiber and increased gradually from 0g (0N) to 120g (1.176N) in 10g unit with the pump power fixed at 360mW, and the following approximately linear changes of self-Q-switched laser pulses outputs are observed by the oscilloscope: the peak voltage of output pulses reduces from 12.59mV to 1.883mV; the pulse repetition rate reduces from 125.0kHz to 66.67kHz; and the pulse width increases from 0.4083μs to 1.28μs.