A compact stabilized three-laser optical pump system for an imaging system based on THz-to-visible conversion via atomic vapour

Brynmor E. Jones; Jack W. Thomas; Adam Selyem; Shaun Jones; Douglas Bremner; Lucy A. Downes; Philip A. Marsden; Pauline Brown; Kevin J. Weatherill

doi:10.1117/12.2609709

5 March 2022 A compact stabilized three-laser optical pump system for an imaging system based on THz-to-visible conversion via atomic vapour

Brynmor E. Jones, Jack W. Thomas, Adam Selyem, Shaun Jones, Douglas Bremner, Lucy A. Downes, Philip A. Marsden, Pauline Brown, Kevin J. Weatherill

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Proceedings Volume PC12009, Quantum Sensing and Nano Electronics and Photonics XVIII; PC120090J (2022) https://doi.org/10.1117/12.2609709
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

THz imaging often struggles to achieve necessary framerates for applications, but recent demonstrations show that an imaging system based upon THz-to-optical conversion in atomic vapour can provide ultrahigh speeds while retaining sensitivity with optical cameras. This atomic vapour imaging requires a multi-frequency near-IR optical pumping system, and we demonstrate a compact system to provide the stable frequencies required for conversion of 0.55 THz light to visible (green) in caesium atoms. Through the integration of distributed feedback (DFB) laser diodes and a compact extended cavity diode laser, and spectroscopy and offset locks based on open-source FPGA and Arduino code, it approaches suitability for wider industrial application.

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Brynmor E. Jones, Jack W. Thomas, Adam Selyem, Shaun Jones, Douglas Bremner, Lucy A. Downes, Philip A. Marsden, Pauline Brown, and Kevin J. Weatherill "A compact stabilized three-laser optical pump system for an imaging system based on THz-to-visible conversion via atomic vapour", Proc. SPIE PC12009, Quantum Sensing and Nano Electronics and Photonics XVIII, PC120090J (5 March 2022); https://doi.org/10.1117/12.2609709

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KEYWORDS

Imaging systems

Terahertz radiation

Cesium

Imaging spectroscopy

Imaging technologies

Semiconductor lasers

Spectroscopy

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