Sub-20 kHz low-frequency noise near ultraviolet butt-coupled fiber Bragg grating external cavity laser diode.

Autor: Kervazo, R., Perin, G., Congar, A., Lablonde, L., Butté, R., Grandjean, N., Bodiou, L., Charrier, J., Trebaol, S.
Předmět:
Zdroj: Applied Physics Letters; 10/14/2024, Vol. 125 Issue 16, p1-7, 7p
Abstrakt: We present a butt-coupled InGaN fiber Bragg grating (FBG) semiconductor laser diode operating below 400 nm in the single-mode emission regime. This compact coherent laser source exhibits an intrinsic linewidth of 14 kHz in the near-UV range and a side-mode suppression ratio reaching up to 40 dB accompanied by almost 2 mW output power. Furthermore, the properties of the FBG, including its central wavelength, bandwidth, and reflectivity, can be readily customized to fulfill specific requirements. As a result, the small footprint design of this laser is compatible with integration into a standard butterfly package to ease the lab-to-market technology transfer. The combination of low-frequency noise and fibered output signal positions these FBG laser systems as strong candidates for hybridization with integrated photonic platforms tailored for quantum information processing and metrology. [ABSTRACT FROM AUTHOR]
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