Linien: A versatile, user-friendly, open-source FPGA-based tool for frequency stabilization and spectroscopy parameter optimization

Wiegand, Benjamin; Leykauf, Bastian; Jördens, Robert; Krutzik, Markus

doi:10.1063/5.0090384

Cited by 17 publications

(6 citation statements)

References 26 publications

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“…While the PIC reference cavity reduces the ADEV of the free-running laser by over 2 orders of magnitude at ~ms averaging times, the drift in the PIC at >10 ms is not sufficient for atomic probing applications which require a reliable reference at or offset from a particular atomic transition. The laser output is split to also route to a rubidium SAS setup and the spectroscopy signal is input to the Red Pitaya running locking software 18 for long-term drift stabilization. The thermal tuning of the cavity is sufficient to apply a 9 kHz dither in the Rb PDH lock loop.…”

Section: Resultsmentioning

confidence: 99%

Dual-stage laser stabilization with a frequency-tunable integrated 118 million Q reference cavity disciplined to 780 nm rubidium spectroscopy

Isichenko,

Chauhan,

Harrington

et al. 2024

Quantum Sensing, Imaging, and Precision Metrology II

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Integrated narrow-linewidth lasers in the visible and near-IR are a critical component of next-generation atomic systems for quantum sensing, time keeping, and navigation. Technologies such as low frequency noise lasers that are tunable and referenced to an absolute frequency set by atomic transitions are required for sensing applications such as cold atom interferometers. While bulk-optic reference cavities can be used for laser noise reduction and stabilization, longer-term frequency drifts are mitigated with a secondary lock to an atomic reference using power-consuming bulk optic technologies such as an acousto-optic frequency shifter. Photonic integrated cavities based on ultra-low-loss silicon nitride (SiN) waveguides enable laser stabilization in a wafer-scale integration platform. Incorporating a secondary lock of these integrated cavities to an atomic reference is an attractive solution for compact chip-scale long term stable references. In this paper we demonstrate the use of a thermo-optic tunable, 118 million Q, 0.44 dB/m loss reference cavity for simultaneous laser frequency noise reduction and absolute frequency referencing to 780 nm rubidium spectroscopy. By tuning the integrated cavity resonance by a range >200 MHz using a thermal tuner with 20 MHz/mW efficiency at over 1 kHz tuning rate, we demonstrate long-term locking of the stabilized laser to rubidium saturation absorption spectroscopy. We achieve up to 4 orders magnitude frequency noise reduction, integral linewidth (betaseparation) reduction from 5 MHz (free-running) to 326 kHz (dual lock) and simultaneously a fractional frequency drift of 8.5e-12 at 1 second, two orders of magnitude improvement compared to locking to the cavity only. These results represent a compact and robust laser for photonic integrated atomic systems that can be extended to probing and locking to narrower linewidth transitions such as the rubidium two-photon at 778 nm and for laser frequency control sequences in cold atom experiments.

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Section: Resultsmentioning

confidence: 99%

Dual-stage laser stabilization with a frequency-tunable integrated 118 million Q reference cavity disciplined to 780 nm rubidium spectroscopy

Isichenko,

Chauhan,

Harrington

et al. 2024

Quantum Sensing, Imaging, and Precision Metrology II

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“…For this reason, we directly implemented both the FPGA program and the Linux driver in order to provide all the necessary functionality and to optimize data transfer performance. Direct FPGA implementation in RP applications has been carried out, for example, in [ 12 ] for frequency stabilization and spectroscopy parameter optimization and in [ 13 ] for the demodulation of high-frequency atomic face microscopy probes.…”

Section: Motivationsmentioning

confidence: 99%

A Versatile Board for Event-Driven Data Acquisition

Manduchi,

Rigoni,

Trevisan

et al. 2024

Sensors

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Event-driven data acquisition is used to capture information from fast transient phenomena typically requiring a high sampling speed. This is an important requirement in the ITER Neutral Beam Test Facility for the development of one of the heating systems of the ITER nuclear fusion experiment. The Red Pitaya board has been chosen for this project because of its versatility and low cost. Versatility is provided by the hosted Zynq System on Chip (SoC), which allows full configuration of the module architecture and the OpenSource architecture of Red Pitaya. Price is an important factor, because the boards are installed in a hostile environment where devices can be damaged by EMI and radiation. A flexible solution for event-driven data acquisition has been developed in the Zynq SoC and interfaced to the Linux-based embedded ARM processor. It has been successfully adopted in a variety of data acquisition applications in the test facility.

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“…Moreover, a system for laser cooling and atom interferometry with 87 Rb atoms was launched in 2017 (MAIUS) [63] and a high-performance optical frequency reference based on molecular iodine (JOKARUS mission) has also been launched [64,65]. Currently, laser systems with even lower SWaP are under development for future operation on CubeSats [66], integrated into standalone piggyback devices [67] where flexible field-programmablegate-array-based tools are used for automatic lock point selection and autonomously optimising spectroscopy parameters [68].…”

Section: Laser and Optical Systemmentioning

confidence: 99%

Optical atomic clock aboard an Earth-orbiting space station (OACESS): enhancing searches for physics beyond the standard model in space

Schkolnik

Budker

Fartmann

et al. 2022

Quantum Sci. Technol.

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We present a concept for a high-precision optical atomic clock (OAC) operating on an Earth-orbiting space station. This pathfinder science mission will compare the space-based OAC with one or more ultra-stable terrestrial OACs to search for space-time-dependent signatures of dark scalar fields that manifest as anomalies in the relative frequencies of station-based and ground-based clocks. This opens the possibility of probing models of new physics that are inaccessible to purely ground-based OAC experiments where a dark scalar field may potentially be strongly screened near Earth’s surface. This unique enhancement of sensitivity to potential dark matter candidates harnesses the potential of space-based OACs

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Linien: A versatile, user-friendly, open-source FPGA-based tool for frequency stabilization and spectroscopy parameter optimization

Cited by 17 publications

References 26 publications

Dual-stage laser stabilization with a frequency-tunable integrated 118 million Q reference cavity disciplined to 780 nm rubidium spectroscopy

Dual-stage laser stabilization with a frequency-tunable integrated 118 million Q reference cavity disciplined to 780 nm rubidium spectroscopy

A Versatile Board for Event-Driven Data Acquisition

Optical atomic clock aboard an Earth-orbiting space station (OACESS): enhancing searches for physics beyond the standard model in space

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