To reduce the thermal effects of laser medium and scale the output power of 1 342 nm all-solid-state laser ,the thermal effects as function of the cross-section dimension of laser medium were investigated ,the composite Nd∶ GdVO4 laser crystal was used as laser medium ,and a plane-concave resonator was employed in experiment .The theoretical calculation showed that the thermal effects were reduced by decreasing the cross-section dimension of laser medium .The experimental results showed that the maximum output power wass 9 .4 W with the conversion efficiency of 32 .4% ,and the output power increased by 38% compared with previous work .%为减小激光介质热效应，进一步提高全固态1342 nm激光器的输出功率，文中研究了激光介质横向尺寸和热效应之间的关系，实验中选用复合式Nd∶GdVO4晶体为激光介质，并采用平凹谐振腔实现1342 nm波段激光．研究结果表明：热效应正比于激光介质的横向尺寸，可以通过减小激光介质横向尺寸以提高激光器输出功率．实验测得优化的激光介质最大输出功率为9．4W，转化效率为32．4％，较前期激光器输出功率提高38％．
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