为了提高激光诱导击穿光谱质量，获得优化的实验条件，以不锈钢样品为靶材，采用高能量铷玻璃脉冲激光烧蚀样品，由多功能组合光栅光谱仪和计算机采集系统记录光谱，分析了激光等离子体在有或无碳室约束条件下的辐射强度变化情况.通过测量电子温度和电子密度，探讨了激光诱导等离子体辐射的增强机理.实验结果表明，当采用内径为4.0 mm、高度为9.0 mm的小型碳室约束激光等离子体时，其发射光谱强度和信噪比均有大幅提高，电子温度和电子密度也有所上升.可见，利用这种空间约束方法能够有效地改善激光光谱质量.

In order to improve the quality of laserinduced breakdown spectroscopy and derive the optimal experiment condition, the change of the radiation intensity of laserinduced stainless steel plasma with and without a small carbon chamber is analyzed, which is excited by a high energy rubidium glass pulsed laser. The mechanism of the laser induced plasma radiation intensity is discussed by measuring the electron temperature and electron density. The results show that when laser plasma is confined by a small carbon chamber with the height 9.0 mm and the internal diameter 4.0 mm, the spectral line intensities and signaltonoise ratio of the sample elements increase substantially. So the spectral quality can improve effectively by using the method of spatial confinement.