High-power, small-sized, water cooling-free and side pump slab laser device

The invention discloses a high-power, small-sized, water cooling-free and side pump slab laser device. A total reflector, a Q switch unit, a polarizer, a pumping module, and an output coupling mirrorare sequentially and coaxially disposed in the direction of laser beam propagation of the device; the total reflector and the output coupling mirror form a resonant cavity, and the total reflector isthe total reflector with 1064 nm; and the Q switch unit is any one of an active Q switch crystal or a voltage-decreased photoelectric Q switch equipped with a feedback control circuit. In the high-power, small-sized, water cooling-free and side pump slab laser device, except non-pumped surface heat dissipation on both faces, two pump faces are also subjected to staggered heat dissipation by a gold-plated copper reflection block, and so, the uniformity of heat dissipation of a double-sided pump laser crystal is ensured, the thermal lens effect of the double-sided pump laser crystal is reduced,wavefront edge distortion o