Laser with automatic power optimization function

The invention discloses a laser with an automatic power optimization function. The laser comprises a closed resonant cavity and a control system, and is characterized in that a pumping source, a pumping mirror, a laser crystal, a Q switch, at least one nonlinear crystal and an endoscope for simultaneously highly reflecting frequency doubling light and fundamental frequency light are arranged in the resonant cavity, the pumping mirror is used as one end mirror of the resonant cavity; the cavity mirror serves as the other end mirror of the resonant cavity; laser emitted by the pumping source sequentially passes through the pumping mirror, the laser crystal, the Q switch, the nonlinear crystal and the cavity mirror to be output, and the laser crystal is used for absorbing the laser output bythe pumping mirror to form laser oscillation between the two end mirrors. The laser further comprises an automatic crystal point changing device, the nonlinear crystal is arranged on the automatic crystal point changing devic