LD端面泵浦Nd∶LiGd(MoO4)2晶体的主动调Q脉冲激光特性

Abstract

The Nd∶LiGd(MoO4)2 crystal samples with different orientations were machined,and their Continuous Wave(CW) and actively modulation laser characteristics were measured and analyzed.A laser diode(LD) end-pumped double mirror cavity was used in the experiment,in which the coupling transmittance of the output mirror was 2%.In CW operation conditions,the maximum output powers of a-cut and c-cut crystals were 733 mW and 550 mW,respectively,corresponding optical conversion efficiencies of 11.3% and 6.7%.In acousto-optic(A-O) operation conditions,the maximum output powers of a-cut and c-cut crystals were 180 mW and 135mW,respectively,corresponding optical conversion efficiencies of 2.8% and 1.7%.The optimum pulse experimental results are obtained when the pulse repetition frequency(PRF) is 10 kHz.It is shown that the largest pulse energy and the highest peak power are 15.8 J and 85 W,respectively,which come from the a-cut sample.The shortest pulse width is 153 ns,which comes from the c-cut sample.Experimental results indicate that Nd∶LiGd(MoO4)2 crystals with different orientations can output different wavelengths in 1061 nm for the a-cut sample and in 1 068 nm for c-cut sample.The multi-wavelength emission property of the Nd∶LiGd(MoO4)2 crystal will help its applications to the THz-wave domain.