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设计和制作了基于晶体双折射的自由空间90°光学桥接器,用于在空间相干激光通信接收机中实现信号光束和本机振荡光束的混合并产生90°相移四通道合成光束输出,实现空间2×490°桥接,以进一步进行光电变换及信号解调和锁相。研制的晶体双折射2×490°光学桥接器由四块结构相同的双折射平板,一块相位延迟平板和一块检偏双折射平板组成。外差测量证明晶体双折射2×490°光学桥接器运行准确有效,性能稳定可靠,并给出了相位补偿和进一步的优化方案。晶体双折射自由空间光学桥接器适用于自由空间相干激光通信,对于未来星载激光通信终端实现小型化、轻量化、低功耗和高码率具有实际意义。
A free-space 90 ° optical bridge based on crystal birefringence was designed and fabricated for the mixing of a signal beam and a local oscillator beam in a spatially coherent laser communications receiver and to produce a 90 ° phase-shifted quad-channel composite beam output Space 2 × 490 ° bridge, for further photoelectric conversion and signal demodulation and phase-locked. The developed birefringent 2 × 490 ° optical bridge consists of four birefringent plates of the same structure, a phase retardation plate and a test bias birefringent plate. Heterodyne measurement shows that the crystal birefringence 2 × 490 ° optical bridge is accurate and effective, the performance is stable and reliable, and the phase compensation and further optimization schemes are given. The crystal birefringence free-space optical bridge is suitable for free-space coherent laser communication, which has practical significance for miniaturization, weight reduction, low power consumption and high code rate of future spaceborne laser communication terminals.