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<p>A reliable and robust active stabilization of different control parameters is key to the success of many experiments. The essential hardware for that; <i>lock-in</i> 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 <i>lock-in</i> 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 <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_90971_Article_IEq1.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="83" /> </InlineMediaObject> <EquationSource Format="TEX">\(\textrm{nV}_{\textrm{rms}}/\sqrt{\textrm{Hz}}\)</EquationSource> </InlineEquation> 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.</p>

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An atomic clock synchronized versatile all-in-one digital ‘LockBox’

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月8日

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  • S. Johnson,
  • S. Das Gupta,
  • T. R. Saravanan,
  • S. Banerjee,
  • S. Majhi,
  • S. De

摘要

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 \(\textrm{nV}_{\textrm{rms}}/\sqrt{\textrm{Hz}}\) 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.