Experimental Investigation of Diode Pumped Double Q-switched Nd3+:YAG Laser

Double Q-switched Laser is realized using LD End-pumped Nd³⁺:YAG crystal, AO modulator and Cr⁴⁺:YAG saturable absorber. The repetition frequency, average output power and pulse width of the laser pulses were investigated experimentally. When the double Q-switched laser works at a stable repetition frequency, in comparison with the single Q-switched case, it is found that the pumped threshold electric current is a little higher, whereas the average output power is lower, the pulse width is narrower and the compression of the pulse width occurs mainly at the fall-edge time. Hence, double Q-switch is advantageous to improve the symmetry of the laser pulse output.