Laser Crystals and Components
The passive Q-switch is actually a saturable absorber, when it is pumped by laser light, it would stores energy and go into a saturated state, its transmission increases which rapidly reduce the resonator loss, and laser pulse is generated. The pulse energy and duration is often fixed, the increase of pumping power only increase the repetition rate of the pulses.
Hangzhou Shalom EO offers variety types of passive Q-switch crystals product, including: Cr4+:YAG, Co2+:MgAl2O4 and V3+:YAG. While Cr:YAG is popular and operates well at 1-μm Nd:YAG lasers, Co:MgAl2O4 (or Co:Spinel) is used for Erbium lasers at 1.54μm and V:YAG is a good choice for 1.3μm lasers.