Johnson S, Das Gupta S, Saravanan T R, Banerjee S, Majhi S, De S
Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune, 411007, India.
Sci Rep. 2025 Apr 8;15(1):12034. doi: 10.1038/s41598-025-90971-8.
A reliable and robust active stabilization of different control parameters is key to the success of many experiments. The essential hardware for that; lock-in detection, RF generator, and proportional-integral-derivative feedback control should have sufficient bandwidth, low noise operation and versatility to use the system in different applications. Here we report a fully digital, all essential requirements in one system (LockBox), featured with complete control cum monitoring of the signals from a touchscreen display and the possibility of operating from a remote PC. The lock-in in it has DC to 840 kHz bandwidth, the sinusoidal generator for RF modulation is up to 62.5 MHz, the system noise is 13.2 [Formula: see text] at 100 kHz, and referenced to a Rubidium-clock. We have demonstrated its use for stabilization of laser frequency using an emulated Pound-Drever-Hall and a fiber spool as two independent references, and also for arm length locking of a Michelson interferometer.
可靠且强大的不同控制参数主动稳定是许多实验成功的关键。为此所需的基本硬件；锁相检测、射频发生器和比例积分微分反馈控制应具有足够的带宽、低噪声运行以及通用性，以便在不同应用中使用该系统。在此，我们报告一种全数字系统（LockBox），它满足所有基本要求，其特点是通过触摸屏显示器对信号进行完全控制和监测，并且可以从远程PC操作。其中的锁相具有直流到840kHz的带宽，用于射频调制的正弦波发生器高达62.5MHz，系统在100kHz时的噪声为13.2[公式：见原文]，并以铷钟为参考。我们已经展示了它用于使用模拟的庞德 - 德弗 - 霍尔和光纤线圈作为两个独立参考来稳定激光频率，以及用于迈克尔逊干涉仪的臂长锁定。
