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8 March 2019 GaN-based frequency stabilized seed laser and tapered amplifiers for first-stage strontium cooling (Conference Presentation)
Ludwig Prade, John Macarthur, Christopher Carson, Caspar C. Clark, John Sharp, Yeshpal Singh, Kai Bongs, Steve Najda, P. Perlin, T. Suski, L. Marona, S. Stanczyk, P. Wisniewski, S. Grzanka, D. Schiavon, M. Leszczyński, Loyd McKnight
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Proceedings Volume 10926, Quantum Sensing and Nano Electronics and Photonics XVI; 109260Q (2019) https://doi.org/10.1117/12.2509350
Event: SPIE OPTO, 2019, San Francisco, California, United States
Abstract
Systems with the ability to observe and manipulate individual quantum states have been brought to applications that include among others satellite-free navigation and high-precision gravimetric sensing. Fundamentally, the applicability of quantum technology is limited by the complexity and financial burden of light sources required for such systems. These sources need to feature high optical power combined with compromised beam quality and frequency-stabilized narrow-linewidths. These parameters directly influence the performance of the quantum technology measurement system. Semiconductor devices are able to provide high brightness over broad spectral regions through band-gap engineering. InGaN-based laser sources can be engineered to operate from 380nm to 530 nm. This aligns well with the transitions of atomic species such as strontium, magnesium and ytterbium. However, a challenge remains to offer the narrow-linewidths (<1 MHz) and the high powers (>100 mW) required for many of these applications. We will present our development of GaN based narrow-linewidth seed and tapered amplifiers to operate at 461nm for first stage strontium cooling. This includes growth of custom optimised GaN epitaxy for operation at 461 nm, a robust ECDL geometry, a novel tapered amplifier design and important work in characterising and minimising the surface reflectivity to identify suitable working parameters. A comprehensive characterization of the device will be presented.
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Ludwig Prade, John Macarthur, Christopher Carson, Caspar C. Clark, John Sharp, Yeshpal Singh, Kai Bongs, Steve Najda, P. Perlin, T. Suski, L. Marona, S. Stanczyk, P. Wisniewski, S. Grzanka, D. Schiavon, M. Leszczyński, and Loyd McKnight "GaN-based frequency stabilized seed laser and tapered amplifiers for first-stage strontium cooling (Conference Presentation)", Proc. SPIE 10926, Quantum Sensing and Nano Electronics and Photonics XVI, 109260Q (8 March 2019); https://doi.org/10.1117/12.2509350
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KEYWORDS
Gallium nitride
Optical amplifiers
Strontium
Laser stabilization
Navigation systems
Cooling systems
Light sources
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