ULTRA LOW PHASE NOISE OPTICAL PHASE LOCKING OF TWO EXTENDED-CAVITY DIODE LASERS FOR AN ATOM INTERFEROMETRY

Sin Hyuk Yim, Sang Eon Park, Sang Bum Lee, D. Cho, Taeg Yong Kwon

Abstract

We present an electrical heterodyne phase locking of two ECDLs (Extended-cavity diode lasers) with a frequency difference of 6.9 GHz. We could increase the bandwidth of the phase locked loop up to 8 MHz with an electrical feedback to a current of a slave ECDL. And we have achieved the residual phase noise below -120 dBrad2/Hz between two phase-locked ECDLs in the frequency range from 100 Hz to 300 kHz, which is the lowest phase noise level ever reported with ECDLs.

Keywords

optical phase-locked loop, extended-cavity diode laser, phase noise, atom interferometry

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TC2 - Photonics

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