Realization of four-wavelength laser simultaneous output by LD sidepumped Nd∶YAG

In order to obtain the four-wavelength laser of 1064nm, 1319nm, 589nm and 660nm simultaneously, two-rod “T”-shaped composite cavity was designed. By simulation and calculation, perfect resonator parameters were chosen to make two fundamental lasers operate stably in large range of pumping current. Taking KTP and LBO crystals as sum-frequency and SHG crystals respectively, when the pumping current is 17A and the repetition rate is 10kHz, the highest average power of 1064nm, 1319nm, 589nm and 660nm is 150mW, 80mW, 2.3W and 1.7W respectively, and the pulse widths of 589nm and 660nm laser are 110ns and 130ns. The result shows that the fourwavelength laser output could be simultaneously obtained by a thermostable “T”-shaped composite cavity.