Abstract
The laser beam with asymmetric divergence angle distribution generated by a laser diode (LD) terribly restricts its application in space laser communication. In this paper, an off-axis transmitting antenna with two parabolic cylindrical reflective mirrors is designed to simultaneously shape, collimate and transmit the laser beam. The simulation results demonstrated that the ratio of beam waist (RBW) of the output beam can be reduced from 2.9998 to 1.0003 and the maximum divergence angle of the output light is compressed to 3.98 μrad. The performance of the system is evaluated under different astigmatism of LD and different transmitting distance. Compared with previous methods, the method proposed in this paper has three main advantages: non-dispersion, fewer reflective mirrors and processing convenience. This paper may not only provide engineers with more practical beam-shaping systems but also provided idea to the designers of off-axis system
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