Experimental research of efficient high power diode-side-pumped GTR-KTP intracavity-doubled CW green laser

Diode-side-pumping and intracavity-doubling technology is available method to achieve high power, high stability and low cost continuous wave (CW) green laser. GTR-KTP, which have higher damage threshold than typical flux grown KTP, is suitable in the frequency doubling of high power continuous laser. Whereas in these cases regular flux-grown KTP crystals would suffer greatly from gray track damage. An efficient high power diode-side-pumped intracavity-doubled laser Nd:YAG/GTR-KTP laser has been developed successfully. By using plane-concave-plane resonator of three mirror, Nd:YAG for laser crystal, and GTR-KTP of II-type phase-matching for frequency doubling, a maximum of 23.6 W CW 532 nm green laser is obtained at input 808 nm pump power of 180 W, corresponding to optical-to-optical conversion efficiency of 13.1%. The power stability of the laser is measured at output power of 22 W. During an hour measurement time, the output power instability is less than 1%. The output beam exhibits a smooth Gaussian-like profile in the far field and the beam factor is measured to be less than 8 measured by knife-edge method at 22 W output power.