机载大功率半导体激光信标系统设计

为配合地面探测跟踪系统对飞行目标的探测，设计了一种以４０ Ｗ 紧凑型半导体激光器为光源、具有一定发散角的机载式单色信标系统。由于系统要满足机载平台加装体积小、质量轻、散热好的要求，设计了一体成型的鳍片式壳体结构，解决系统散热问题的同时，控制了整体质量。为实现在有限体积内，４０ Ｗ 单阵列光纤耦合半导体激光器模块所需的６０A 大电流恒流驱动，采用叠相调制技术和同步ＢUＣＫ 变换电路结构；为解决激光器在高空低温环境下输出光功率和中心波长能够稳定控制的难题，设计了数模混合双向温控系统。利用ＺEMAX 软件设计了双凹透镜组结构的扩束装置，实现了对激光发散角的发散和可调节。通过环境考核测试，系统在０℃～１５℃的低温环境下，输出光功率稳定度和波长控制精度均能满足要求。

Airborne beacon system design of high-power semiconductor laser

In order to coordinate with the ground detection tracking system for detecting the flight target, we designed an air-based monochromatic beacon system. A 40W high-power semiconductor laser is used as the light source of the system, which has a certain beam divergence. As the beacon system should meet the requirements of smaller in size, lighter in weight and faster in heat dissipating to fit the air-platform, we designed the aluminum shell as fin chip in one piece for laser, which helped solve the heat dissipation problem and reduce the system weight. To achieve the 60A high constant current, we need to drive the 40W semiconductor laser module in the limited room, the principle of diphase overlay synchronous and buck transformation circuit structure is adopted. To make the laser output power and central wavelength stable in high altitude, we designed the temperature control system with digital and analog hybrid for heating or cooling. The ZEMAX is used to design the structure of the beam expander device with double-concave lens group, which can regulate the angle of divergence of the light beam. By conducting the environmental assessment and test, we proved that in the 0℃～15 ℃ environment, the stability of the output power and the control precision of the central wavelength could meet the requirements.