The method of using the A-0 feedback at Brewster angle in cavity is introduced to reduce the noise of He-Cd laser and the results have been good.

• 提出用腔内布氏角插入声光反馈器伺服反馈；抑制氦镉激光噪声和提高功率稳定性的方法；获得满意的实验结果.