Passive intrinsic-linewidth narrowing of ultraviolet extended-cavity diode laser by weak optical feedback

We present a simple method for narrowing the intrinsic Lorentzian linewidth of a commercial ultraviolet grating extended-cavity diode laser (TOPTICA DL Pro) using weak optical feedback from a long external cavity. We achieve a suppression in frequency noise spectral density of 20 dB measured at freq...

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Bibliographic Details
Published in:Optics express 2014-05, Vol.22 (10), p.11592-11599
Main Authors: Samutpraphoot, Polnop, Weber, Sophie, Lin, Qian, Gangloff, Dorian, Bylinskii, Alexei, Braverman, Boris, Kawasaki, Akio, Raab, Christoph, Kaenders, Wilhelm, Vuletić, Vladan
Format: Article
Language:English
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Summary:We present a simple method for narrowing the intrinsic Lorentzian linewidth of a commercial ultraviolet grating extended-cavity diode laser (TOPTICA DL Pro) using weak optical feedback from a long external cavity. We achieve a suppression in frequency noise spectral density of 20 dB measured at frequencies around 1 MHz, corresponding to the narrowing of the intrinsic Lorentzian linewidth from 200 kHz to 2 kHz. Provided additional active low-frequency noise suppression and long-term drift compensation, the system is suitable for experiments requiring a tunable ultraviolet laser with narrow linewidth and low high-frequency noise, such as precision spectroscopy, optical clocks, and quantum information science experiments.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.22.011592