Digital laser frequency and intensity stabilization based on the STEMlab platform (originally Red Pitaya)

Abstract

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-inch rack mount units. Printed circuit board layouts are made available as an open-source project.\cite{APQGit_Lockbox,APQGit_IntStab} 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 $10^{-3}$ level with sub-microsecond rise and fall times based on an acousto-optic modulator as actuator is achieved.

References in corpus (5)

• An open-source high-frequency lock-in amplifier
• An open and flexible digital phase-locked loop for optical metrology
• A highly stable monolithic enhancement cavity for SHG generation in the UV
• Compact embedded device for lock-in measurements and experiment active control
• Optimization strategies for modulation transfer spectroscopy applied to laser stabilization

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• Wideband current modulation of diode lasers for frequency stabilization
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• Low Duty Cycle Pulsed UV Technique for Spectroscopy of Aluminum Monochloride
• Model-Based Real-Time Synthesis of Acousto-Optically Generated Laser-Beam Patterns and Tweezer Arrays
• $\Lambda$-Enhanced Gray Molasses Cooling of ${}^{85}$Rb Atoms in Tweezers Using the D${}_2$ Line