In-band pumped Q-switched fiber laser based on monolayer graphene

Abstract

We propose and demonstrate an in-band pumped all-fiberized passively Q-switched laser emitting at 1080 nm. A single mode 1030 nm fiber laser is used as the pump source, while a 2D material, CVD-grown monolayer graphene, is adopted as a saturable absorber inside the ring cavity. The repetition rate of the output pulses can be varied from 12.74 to 24.6 kHz with the pulse duration around 12 µs. The maximum average output power is 34.25 mW, with the pulse energy of 1.392 µJ. This work proves the practicability of achieving passively Q-switched operation via in-band pump.

Black phosphorus for near-infrared ultrafast lasers in the spatial/temporal domain

“…To obtain ultrafast pulse with high signal to noise ratio (SNR) and longterm stability, the saturable absorber (SA) is a key component [16][17][18][19]. In recent years, a series of low dimensional materials as SAs in optical photonics devices have been realized, including but not limited to graphene [20][21][22], transition metal dichalcogenides (TMDCs) [14,[23][24][25], topological insulators (TI) [26], Mxene [27,28], bismuthine [29,30], BP [31][32][33] and so on [34][35][36][37][38][39][40][41]. Notably, graphene is gapless [42], leading to weak optical absorption.…”