LD End-pumped Intracavity Frequency Doubled Yb:YAG Green Laser

A laser diode end-pumped 10at% doped Yb:YAG microchip crystal intracavity frequency doubled all solid-stated green laser was reported.In order to overcome the problem of green problem of SHG,two polarization-coupled laser diodes system were used.With the pump power of 1.2 W,40 mW TEM00 continuous wave laser at 525 nm was obtained,and the optical conversion efficiency is 3.3%.When inserting Cr4+:YAG crystal with 98% low-power transmission in the resonator,the maximum output power of 5.2 mW,pulse duration width of 51.5 ns,the pulse repetition rate of 2.44 kHz and the peak power of 41.7 W at 515 nm were achieved when the pump power was 1.2 W.The wavelength was changed from 525nm to 515nm and the threshold was only 728 mW.