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- Title
Optical phase locking of two extended-cavity diode lasers with ultra-low phase noise for atom interferometry.
- Authors
Yim, Sin; Lee, Sang-Bum; Kwon, Taeg; Park, Sang
- Abstract
We present a phase coherent laser system with ultra-low phase noise with a frequency difference of 6.9 GHz. The laser system consists of two extended-cavity diode lasers that are optically phase-locked with electrical feedback to the injection current of a slave laser. The bandwidth of the optical phase-locking loop is extended up to 8 MHz. We achieve the residual phase noise of two phase-locked lasers of below −120 dBrad/Hz in the offset frequency range of 100 Hz-350 kHz and a flat phase noise of −127 dBrad/Hz from 700 Hz to 20 kHz. These results are, to the best of our knowledge, the lowest phase noise level ever reported with two extended-cavity diode lasers.
- Subjects
EXTENDED cavity diode lasers; OPTICAL phase locked loops; ELECTRIC noise; ATOM interferometers; COHERENCE (Physics); ELECTRONIC feedback
- Publication
Applied Physics B: Lasers & Optics, 2014, Vol 115, Issue 4, p491
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-013-5629-5