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双频激光器是诸多精密测量应用的核心传感部件。为解决双频Nd:YAG激光器拍频信号频差大、功率小、难以采集的技术难点,该文设计并实现了一套宽频带空间光外差信号采集系统。采用大口径光纤准直器有效地解决了对空间光束的耦合接收问题,送入高速光电接收器进行光电转换,经集成微波放大器模块对频差信号进行放大,最后由VB语言实现频率计与计算机的通讯,完成拍频信号的实时采集和存储。实验结果表明:该系统对空间光信号耦合效率高达90%,放大器增益47dB,实现了对1.5GHz以内拍频信号的有效采集。此系统效率高、可移植性好,为双频激光器大频差信号提供了可靠的采集方法。
Dual-frequency lasers are the core sensing components for many precision measurement applications. In order to solve the technical difficulties of the dual-frequency Nd: YAG laser with the large frequency difference, small power and difficult to acquire, a set of wide-band spatial heterodyne signal acquisition system is designed and implemented. Large-caliber fiber collimator effectively solves the problem of coupling and receiving space beam, sends it into high-speed photoelectric receiver for photoelectric conversion, enlarges the frequency difference signal by integrated microwave amplifier module, and finally implements the frequency meter and computer Communication, complete beat signal acquisition and storage in real time. Experimental results show that the system achieves 90% coupling efficiency with space optical signal and 47dB amplifier gain, which can effectively capture beacon signals within 1.5GHz. The system is highly efficient and has good portability and provides a reliable method for collecting large frequency difference signals in dual-frequency lasers.