大容差中波红外激光通信终端光学天线研制

为了降低激光通信光学系统公差要求，节省研制成本，减小大气散射对激光通信链路的影响，采用波长工作在大气窗口的中红外激光器作为激光通信光源，研制了与之匹配的中波红外激光通信终端光学系统。首先，利用激光通信能量链路传输方程，根据中波红外激光器光束参数和接收端探测器灵敏度，计算出光学天线口径、发散角等设计参数，并给出激光通信收发光学系统波像差要求。接着，利用ZEMAX软件进行了中红外激光通信收发光学系统的设计与公差分析，对两系统进行了加工、测试，完成了系统研制。测试结果显示，中红外激光通信发射光学天线光学传递函数与理论值最大偏离9.3%，接收光学系统波像差RMS为0.075λ (λ=4.7 μm)，满足设计要求。结果表明:采用中红外激光作为激光通信光源可降低光学天线的加工装调难度。

Development of optical antenna for middle infrared laser communication terminal

In order to reduce the tolerance of laser communication optical system, save the development cost, and reduce the influence of atmospheric scattering on laser communication link, the middle infrared laser with its wavelength working at the atmosphere window was used as the laser communication light source, and a matching middle infrared laser communication terminal optical system was developed. Firstly, based on the energy link transmission equation of laser communication, the design parameters of the optical antenna, such as aperture and divergence angle, were calculated according to the beam parameters of the middle infrared laser and the detector sensitivity of the receiving terminal, and the wave aberration requirements of the optical transmitting and receiving system of laser communication were given. Then, the design and tolerance analysis of the optical system for the middle infrared laser communication optical antenna were carried out by ZEMAX software, and the system was processed and adjusted to complete the development of the system, and the image quality of the two optical systems was tested. The test results show that the maximum deviation of transmitting optical system MTF from the theoretical value is 9.3%, and the wavefront aberration RMS of the receiving optical system is 0.075λ (λ=4.7 μm), which meets the design requirements. The results show that the difficulty of processing and adjusting optical antenna can be reduced by using the middle infrared laser as the laser communication light source.