半导体激光耦合新方法

提出了一种脱离国外模式的半导体激光耦合新方法,使用该方法既可以直接将半导体激光耦合成亮度均匀、光束参数积（BPP）值在两个方向相等的方形光斑,也可和光纤耦合得到一个圆形光斑,且只用球面镜和柱面镜两种光学元件,不需采用国外方法中用到的其它类型微光纤元件。将系统的出瞳作为光斑来解决亮度均匀分布问题;通过消除光源间隔对BPP值的影响来减小慢轴的BPP值;利用点光源的特点使快轴和慢轴的BPP值相等。采用该方法设计了各种要求和规格的半导体激光耦合光学系统,如本文设计实例中的参数为：巴条上的光源数为19个,巴条数为21个,故光源总数为399个。得到的方形光斑尺寸为0.6 mm×0.6 mm,NA值为0.22。此外,和直径为1 mm光纤耦合还得到了一圆形光斑。与国外方法比较,该方法结构简单,工艺要求低,更适用于高功率、低BPP值的半导体激光器。

Improved method for semiconductor laser coupling

This paper attempts to look for a new method to obtain a square spot whose brightness distribution is homogeneous and the value of BPP is equal in two directions. Moreover, a spherical spot may be obtained too, if it is coupled with a fiber. The method only adopts the cylindrical and the spherical lenses and no other kinds of micro optical elements unlike the methods in foreign countries. An exit pupil of the system is taken as a spot to solve the problem of brightness homogeneous distribution, and the spacing influence of the light sources up- on the value of BPP is clean up to decrease the value of BPP of the slow axis. Furthermore, the characteristic of the point light source is utilized to allow the BPP values of the fast axis and the slow axis to be equaled. Fi- nally, this new method is used to design the coupling optical systems with different demands and specifica- tions. The design example in this paper shows that there are 19 light sources at a bar, and the number of the bars is 21, then the total number of the light sources is 399. The size of the square spot obtained is 0. 6 mm ×0. 6 mm and NA is 0.22. The spherical spot can be obtained if the system is coupled with the fiber with a di- ameter of 1 mm. Compared to the foreign methods, the construction of the new method is simpler and the de- mand for crafts is lower. The new method is suitable for the semiconductor lasers with high power and low val- ues of BPP