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详细推导了采用色散型布儒斯特扩束器加光栅调谐脉冲钛宝石激光器压窄线宽的原理，纠正了原有理论的错误之处，实验结果和理论结果相吻合。该系统具有较宽的连续调谐范围和较窄的线宽（＜０．０１ｎｍ），并获得较高的窄线宽运转的激光效率（３０％）。
The principle of using dispersive Brewster beam expander with grating tuned Ti: sapphire laser to narrow the line width is deduced in detail, and the errors of the original theory are corrected. The experimental results are in good agreement with the theoretical results. The system has a wider continuous tuning range and narrower linewidth (<0.01nm) and achieves higher laser efficiency (30%) for narrow linewidth operation.