期刊
PHYSICAL REVIEW LETTERS
卷 118, 期 26, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.263202
关键词
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资金
- Centre for Quantum Engineering and Space-Time Research (QUEST)
- Physikalisch-Technische Bundesanstalt (PTB)
- JILA Physics Frontier Center (NSF)
- National Institute of Standards and Technology (NIST)
- EMPIR programme [15SIB03 OC18]
- European Union's Horizon research and innovation programme
- European Metrology Research Programme (EMRP) under QESOCAS
- EMRP within EURAMET
- EMRP within European Union
- Alexander von Humboldt Foundation
- National Defense Science and Engineering Graduate (NDSEG) fellowship
We report on two ultrastable lasers each stabilized to independent silicon Fabry-Perot cavities operated at 124 K. The fractional frequency instability of each laser is completely determined by the fundamental thermal Brownian noise of the mirror coatings with a flicker noise floor of 4 x 10(-17) for integration times between 0.8 s and a few tens of seconds. We rigorously treat the notorious divergences encountered with the associated flicker frequency noise and derive methods to relate this noise to observable and practically relevant linewidths and coherence times. The individual laser linewidth obtained from the phase noise spectrum or the direct beat note between the two lasers can be as small as 5 mHz at 194 THz. From the measured phase evolution between the two laser fields we derive usable phase coherence times for different applications of 11 to 55 s.
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