“…The Q-switching is a key method to acquire pulsed laser with high energy, for which different techniques have been explored. [18][19][20] Compared with active Q-switching, passive Q-switching largely depends on saturable absorbers (SAs) whose modulated parameters are beyond manual control, resulting in low pulse energy and unstable repetition rate. Active Q-switching has been done through diverse types of mechanical devices, containing rotating mirrors, prisms, electro-optical (EO) crystals, [21,22] and acousto-optical (AO) crystals.…”