The resuls show that , ander some conditions , their laser threshold is lower and efficiency higher than that of equal-lengen to the cavi-ty.

• 实验结果发现：在相同条件下，激光棒适当长于椭圆泵浦腔（灯弧长），与棒和椭圆泵浦腔（灯弧长）相等时相比，能降低泵浦阈值、提高输出效率。