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Optical phase locking of two extended-cavity diode lasers with ultra-low phase noise for atom interferometry

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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 dBrad2/Hz in the offset frequency range of 100 Hz–350 kHz and a flat phase noise of −127 dBrad2/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.

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Acknowledgments

This work was in part supported by the Korea Research Institute of Standards and Science under the project ‘Establishment of National Physical Measurement Standards and Improvements of Calibration/Measurement Capability,’ Grant 12011002 and by a grant to Atomic Interferometer Research Laboratory for National Defense funded by DAPA/ADD.

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Authors and Affiliations

  1. Korea Research Institute of Standards and Science, Daejeon, 305-340, Korea

    Sin Hyuk Yim, Sang-Bum Lee, Taeg Yong Kwon & Sang Eon Park

  2. Agency for Defense Development, Daejeon, 305-154, Korea

    Sin Hyuk Yim

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  1. Sin Hyuk Yim
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  2. Sang-Bum Lee
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  3. Taeg Yong Kwon
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  4. Sang Eon Park
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Correspondence to Sang Eon Park.

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Yim, S.H., Lee, SB., Kwon, T.Y. et al. Optical phase locking of two extended-cavity diode lasers with ultra-low phase noise for atom interferometry. Appl. Phys. B 115, 491–495 (2014). https://doi.org/10.1007/s00340-013-5629-5

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  • DOI: https://doi.org/10.1007/s00340-013-5629-5

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