Double-Arched LD Array Stagger Pumped Electro-Optic Q-Switched Nd：YAG Laser without Water Cooling

We report an experimental study on a double-arched LD array stagger pumped electro-optic Q-switched Nd：YAG laser without water cooling by using a convex-concave compensate resonator. Perfect matching of the gain field inside the rod and the fundamental mode of the cavity is made by this structure. When the repetition rate is 20 Hz, A maximum output energy at 1064 nm wavelength of 176 mJ （M2=1.55） and 9.6 ns FWHM pulse width in fundamental mode Q-switch operation is obtained with LD injection current 120 A. The optical-optical conversion efficiency is 14.7%, the divergence angle of the output beam is about 1.8 mrad.