Sub-kilohertz linewidth free-running monolithic cavity VECSEL with 10−12 stability
Moriya, P. H. and Lee, M. and Hastie, J. E. (2024) Sub-kilohertz linewidth free-running monolithic cavity VECSEL with 10−12 stability. Applied Physics Letters, 125 (2). 021101. ISSN 0003-6951 (https://doi.org/10.1063/5.0208564)
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Abstract
We report the development of a compact, highly stable, monolithic-cavity, GaInP/AlGaInP-based vertical-external-cavity surface-emitting laser (VECSEL) with electronically tunable emission wavelength centered at 689.4425 nm for neutral strontium (Sr)-based applications. The output power reaches 40 mW (pump-power-limited) with ultra-low frequency and intensity noise performance resulting in a free-running linewidth of 720 Hz, reduced to 390 Hz when frequency locked to a reference cavity and verified via a heterodyne beat note measurement with 2 s averaging time. For shorter averaging times (0.1 ms), the free-running linewidth is as low as 40 Hz. We estimate a Lorentzian, or intrinsic, linewidth of 64 mHz from the frequency noise power spectral density at high frequencies, thus providing further evidence of the ultra-narrow fundamental linewidth of VECSELs. High frequency stability was measured via Allan deviation resulting in 1.05 × 10−12 at 2 s and 2.11 × 10−13 at 7 s averaging times when the 689 nm monolithic cavity VECSEL is free-running and locked, respectively, suitable for neutral Sr-based quantum technologies, such as optical clocks and atom interferometry.
ORCID iDs
Moriya, P. H. ORCID: https://orcid.org/0000-0002-6761-191X, Lee, M. and Hastie, J. E. ORCID: https://orcid.org/0000-0002-4066-7411;-
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Item type: Article ID code: 89942 Dates: DateEvent8 July 2024Published8 July 2024Published Online29 May 2024Accepted25 March 2024SubmittedSubjects: Science > Physics Department: Faculty of Science > Physics > Institute of Photonics
Strategic Research Themes > Measurement Science and Enabling Technologies
Technology and Innovation Centre > PhotonicsDepositing user: Pure Administrator Date deposited: 17 Jul 2024 08:38 Last modified: 16 Oct 2024 00:56 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/89942