Passively Q-switched operation of a 1.94 µm thulium-doped solid-state laser based on MXene V2CTx

Abstract

MXene V 2 CT x has great practicability because it is not easy to degrade under ambient conditions. In this paper, a V 2 CT x saturable absorber (SA) was firstly applied to a passively Q-switched (PQS) laser, to the best of our knowledge. The V 2 CT x -SA was prepared by the spin-coating method. The linear absorption of the V 2 CT x -SA in the 1000-2200 nm region and the nonlinear absorption near 2 μm were studied. With the V 2 CT x -SA, a typical PQS operation at 1.94 μm was realized in a Tm:YAlO 3 laser. The minimum pulse width produced by the PQS laser was 528 ns, and the peak power, repetition rate, and average output power were 10.06 W, 65.9 kHz, and 350 mW, respectively. Meanwhile, the maximum pulse energy was 6.33 μJ. This work demonstrates that the V 2 CT x can be used as an effective SA to obtain nanosecond pulses with high peak power and high repetition rate simultaneously.

Beam quality prediction for Tm-doped fiber system based on finite-difference beam propagation method

“…Thulium-doped fiber lasers (TDFLs) operating in the 2 μm region have been widely used in medical treatment, industrial processing, and environmental monitoring [1][2][3][4] over the past decade. Owing to relatively large quantum defects, the thermally induced refractive index variation becomes serious in the active fiber as the output power of the fiber lasers increases to the level of 1 kW, which prevents the attainment of a stable neardiffraction-limited beam quality.…”

Influence of Pedestal Fiber Splice on Tm-Doped Fiber Laser Performance

“…hulium-doped fiber lasers (TDFLs) operating in the 1900-2100nm wavelength region have been used in a wide variety of applications, such as light detection and ranging systems, surgery treatment and plastic material processing [1][2][3][4][5] during the last decade. In the previous works, several groups have performed remarkable experiments, setting a series of records for large-mode-area (LMA) high average output power TDFLs.…”