Quasi-2D perovskites for high-power passive Q-switching in a 1.9 μm solid-state laser

Abstract

Quasi-two-dimensional (quasi-2D) perovskites have received tremendous research interest in nonlinear optical applications due to their impressive optoelectronic properties. This work focuses on designing large organic cations in a quasi-2D perovskite film coated on a quartz substrate and the corresponding effects on the performance of saturable absorption in a Q-switch laser. Low-threshold and high-power passive Q-switch operations for a solid-state laser were realized at 1.9 μm. A stable passive Q-switch laser operated with maximum average output power at 1.15 W and maximum single pulse energy at 9.3 μJ. As the input pump power increases from 2.8 W (threshold) to 8.5 W, the pulse width decreases from 1.8 μs to 220 ns and the repetition rate increases from 38 kHz to 123 kHz accordingly. This indicated the promising commercial potential of a quasi-2D perovskite film applied in mid-infrared laser pulses with high power and high pulse energy.