We report on the development, implementation, and characterization of digital controllers for laser frequency stabilization as well as intensity stabilization and control. Our design is based on the STEMlab (originally Red Pitaya) platform. The presented analog hardware interfaces provide all necessary functionalities for the designated applications and can be integrated in standard 19-in. rack mount units. Printed circuit board layouts are made available as an open-source project (T. Preuschoff et al., https://github.com/TU-Darmstadt-APQ/RedPitaya-Lockbox, 2020 and T. Preuschoff et al., https://github.com/TU-Darmstadt-APQ/RedPitaya-IntStab, 2020). A detailed characterization shows that the bandwidth (1.25 MHz) and the noise performance of the controllers are limited by the STEMlab system and not affected by the supplementary hardware. Frequency stabilization of a diode laser system resulting in a linewidth of 52(1) kHz (FWHM) is demonstrated. Intensity control to the 1 × 10-3 level with sub-microsecond rise and fall times based on an acousto-optic modulator as actuator is achieved.

中文翻译：

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基于STEMlab平台（原为Red Pitaya）的数字激光频率和强度稳定

我们报告了用于激光频率稳定以及强度稳定和控制的数字控制器的开发、实施和表征。我们的设计基于 STEMlab（原为 Red Pitaya）平台。所提供的模拟硬件接口为指定的应用程序提供了所有必要的功能，并且可以集成在标准的 19 英寸中。机架安装单元。印刷电路板布局作为开源项目提供（T. Preuschoff 等人，https://github.com/TU-Darmstadt-APQ/RedPitaya-Lockbox，2020 和 T. Preuschoff 等人，https： //github.com/TU-Darmstadt-APQ/RedPitaya-IntStab，2020）。详细的表征表明，控制器的带宽 (1.25 MHz) 和噪声性能受 STEMlab 系统的限制，不受辅助硬件的影响。演示了导致 52(1) kHz (FWHM) 线宽的二极管激光器系统的频率稳定性。基于声光调制器作为致动器，强度控制到 1 × 10-3 级，上升和下降时间为亚微秒。