半导体激光器二维远场分布图的实时测量

Real-time measurement of two dimentional far field pattern for semiconductor lasers

激光的横模通常靠测量远场分布而得。工作波长为λ的半导体激光器,如果结的截面尺寸为(?)、(?),那么它的横基模(m=e=1)的远场分布可近似表示为:在结平面上:

We have demonstrated experimentally that the photodiode array is a useful tool for realtime measurement of two dimensional farfield pattern for semiconductor lasers thereby one can obtain the transverse mode structure which appears very important in optic fiber communication.