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

@article{Samutpraphoot2014PassiveIN,
  title={Passive intrinsic-linewidth narrowing of ultraviolet extended-cavity diode laser by weak optical feedback.},
  author={Polnop Samutpraphoot and Sophie Weber and Qian Lin and Dorian A. Gangloff and Alexei Bylinskii and Boris Braverman and Akio Kawasaki and C. Raab and Wilhelm G. Kaenders and Vladan Vuleti{\'c}},
  journal={Optics express},
  year={2014},
  volume={22 10},
  pages={
          11592-9
        }
}
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… 
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