Advances in All-Solid-State Passively Q-Switched Lasers Based on Cr4+:YAG Saturable Absorber

All-solid-state passively Q-switched lasers have advantages that include simple structure, high peak power, and short sub-nanosecond pulse width. Potentially, these can be applied in multiple settings, such as miniature light sources, laser medical treatment, remote sensing, precision processing. Cr4+:YAG crystal is an ideal Q-switch material for all-solid-state owing to its thermal conductivity, low saturation intensity, damage threshold. This study summarizes the research progress on use a saturable absorber discusses further prospects development application of lasers.