Q-switched all-fiber laser with short pulse duration based on tungsten diselenide

Abstract

Fiber lasers are widely used in industrial processing, sensing, medical and communications applications due to their simple structure, good stability and low cost. With the rapid development of fiber lasers and the sustained improvement of industrial laser quality requirements, researchers in ultrafast optics focus on how to get laser pulses with high output power and narrow pulse duration. Q-switched technology is one of the most effective techniques to generate ultrashort pulses. In this paper, a tungsten diselenide saturable absorber with 16.82% modulation depth is prepared by chemical vapor deposition. Experimental results show that when the pump power changes from 115.7 mW to 630 mW, the all-fiber laser can achieve a stable Q-switched pulse output. The repetition rate of the output pulse varies from 80.32 kHz to 204.2 kHz, the pulse duration is 581 ns, the maximum output power is 17.1 mW and the maximum pulse energy is 83.7 nJ. Results in this paper show that tungsten diselenide can be applied to ultrafast optics, which is a kind of saturable absorption material with excellent properties.

The SnSSe SA with high modulation depth for passively Q-switched fiber laser

“…The excellent properties of ultrafast relaxation time, high damage threshold and broadband absorption capacity of graphene make it shine in the applications [10][11][12][13]. In addition to graphene which has set off a research boom, other materials, such as transition metal dichalcogenides (TMDs), black phosphorus (BPs), and topological insulators [14][15][16][17][18][19][20][21][22][23][24][25][26][27], are gradually coming into view. In recent years, TMDs have been the focus of attention, because of the diversity of materials [25][26][27].…”

MoS2 saturable absorber prepared by chemical vapor deposition method for nonlinear control in Q-switching fiber laser

“…The neighbor layers of TMDs are bonded with weak van der Waals force, which indicates layered nanosheets are easily separated from the sample. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] From previous work, the band gap of TMD varies with the number of lay-ers, and so the consequent layer-dependent electronic and optical characteristics are attracting increasing attention. [37][38][39] Among TMDs, MoS 2 is prominent considering its performance in photoelectrons.…”