Sheet titanium sapphire multi-pass amplifier

The invention belongs to the technical field of lasers, and particularly relates to a slice titanium sapphire multi-pass amplifier which comprises a seed light source, a laser gain medium, a pumping source, a reflecting mirror system composed of a plurality of reflecting mirrors and a water cooling device. The laser gain medium is arranged at the intersection of pumping laser generated by the pumping source and seed light generated by the seed light source, a high-reflection film for reflecting the pumping laser and the seed light is arranged on the rear surface of the thin titanium sapphire, and heat exchange is conducted between the rear surface of the thin titanium sapphire and circulating cooling water and between the rear surface and the face adjacent to the rear surface of the thin titanium sapphire. And the water cooling device is used for circularly cooling the circulating cooling water. The rear surface of the sheet titanium sapphire and the surface adjacent to the rear surface are wrapped by circula