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 980 nm laser source is more than 110 mW. The external pressure is exerted on the DBR fiber and increased gradually from 0 g (0 N) to 120 g (1.176 N) in 10 g unit with the pump power fixed at 360 mW, 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 12.59 mV to 1.883 mV; the pulse repetition rate reduces from 125.0 kHz to 66.67 kHz; and the pulse width increases from 0.4083 μs to 1.28 μs.

Synergistic flame retardancy of aluminum diethylphosphinate and piperazine pyrophosphate/β‐cyclodextrin in polylactic acid

“…It is synthesized through the copolymerization of piperazine and phosphoric acid, boasting a high initial decomposition temperature and remarkable carbonization ability. Consequently, PAPP finds extensive use in various flame‐retardant composites, including polypropylene (PP), 10–12 polylactic acid, 13 unsaturated polyester, 14 polyamide, 15 and acrylonitrile‐butadiene‐styrene copolymer (ABS) 16 . Chen et al prepared a flame‐retardant composite material of piperazine pyrophosphate and melamine cyanuric acid in polylactic acid (PLA).…”