Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 24, Issue 20, Pages 1795-1798Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2012.2214029
Keywords
Diode lasers; laser stability; optical feedback; optical injection; optical resonators
Funding
- National Basic Research Program of China [2005CB724501]
- National Science and Technology Infrastructure Program of China [2006BAK03A20]
- National Major Research Program of China [2010CB922902]
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We present a narrow-linewidth diode laser with optical feedback from a high-finesse two-mirror nonconfocal cavity. The laser's full-width-at-half-maximum linewidth is reduced to 100 Hz, and its instantaneous linewidth to 30 Hz in the Lorentzian fitting. To the best of our knowledge, it is the narrowest linewidth ever achieved with the optical feedback method. The laser phase noise has been significantly reduced by more than 50 dB in the frequency range from 10 Hz to 10 kHz. Our experiment demonstrates the efficient laser linewidth reduction and phase noise suppression by the optical feedback technique.
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