Infrared vertical external cavity surface emitting laser threshold quantum magnetometer

Nathan S. Gottesman; Michael A. Slocum; Gary A. Sevison; Michael Wolf; Michal L. Lukowski; Chris Hessenius; Mahmoud Fallahi; Robert G. Bedford

doi:10.1117/12.2692163

12 March 2024 Infrared vertical external cavity surface emitting laser threshold quantum magnetometer

Nathan S. Gottesman, Michael A. Slocum, Gary A. Sevison, Michael Wolf, Michal L. Lukowski, Chris Hessenius, Mahmoud Fallahi, Robert G. Bedford

Author Affiliations +

Proceedings Volume 12868, Vertical External Cavity Surface Emitting Lasers (VECSELs) XIII; 1286806 (2024) https://doi.org/10.1117/12.2692163
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

One of the most promising candidates to use as compact high sensitivity magnetometers is the Nitrogen-Vacancy (NV) center, however traditional implementations of this technology are plagued by low collection efficiencies or poor signal contrasts of the Optically Detected Magnetic Resonance (ODMR). Laser Threshold Magnetometry (LTM) offers a path towards both efficient signal collection and high signal contrasts by taking advantage of near threshold laser dynamics. We demonstrate an infrared LTM using a Vertical External Cavity Surface Emitting Laser (VECSEL) with an intra cavity diamond plate doped with NV centers. The VECSEL was tuned to the spin dependent absorption line of the NV centers, which tied the VECSEL output power to the magnetic field sensed by the NV centers. Furthermore, the contrast and the projected sensitivity limit are shown to improve when operating close to the lasing threshold. We measure a sensitivity of 7.5 nT/√ Hz between 10-50 Hz with a contrast of 18.4% and a projected Photon Shot Noise Limited (PSNL) sensitivity of 26.6 pT/√ Hz close to threshold. We also observe a saturable absorption-like effect near threshold, which further enhances the signal contrast and projected PSNL near threshold. A rate equation model for the VECSEL threshold magnetometer is described and is fit to mimic the observed threshold dynamics.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Nathan S. Gottesman, Michael A. Slocum, Gary A. Sevison, Michael Wolf, Michal L. Lukowski, Chris Hessenius, Mahmoud Fallahi, and Robert G. Bedford "Infrared vertical external cavity surface emitting laser threshold quantum magnetometer", Proc. SPIE 12868, Vertical External Cavity Surface Emitting Lasers (VECSELs) XIII, 1286806 (12 March 2024); https://doi.org/10.1117/12.2692163

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