Passive intrinsic-linewidth narrowing of ultraviolet extended-cavity diode laser by weak optical feedback
Author(s)Samutpraphoot, Polnop; Weber, Sophie; Lin, Qian; Gangloff, Dorian; Bylinskii, Alexei; Braverman, Boris; Kawasaki, Akio; Raab, Christoph; Kaenders, Wilhelm; Vuletic, Vladan; ... Show more Show less
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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.
DepartmentHarvard-MIT Center for Ultracold Atoms; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of Electronics
Optical Society of America
Samutpraphoot, Polnop, Sophie Weber, Qian Lin, Dorian Gangloff, Alexei Bylinskii, Boris Braverman, Akio Kawasaki, Christoph Raab, Wilhelm Kaenders, and Vladan Vuletic. “Passive Intrinsic-Linewidth Narrowing of Ultraviolet Extended-Cavity Diode Laser by Weak Optical Feedback.” Optics Express 22, no. 10 (2014): 11592.