Phase noise measurement of external cavity diode lasers and implications for optomechanical sideband cooling of GHz mechanical modes

Cavity-optomechanical cooling via radiation pressure dynamical backaction enables ground-state cooling of mechanical oscillators, provided the laser exhibits sufficiently low phase noise. In this paper, we investigate and measure the excess phase noise of widely tunable external cavity diode lasers, which have been used in a range of recent nano-optomechanical experiments, including ground-state cooling. We report significant excess frequency noise, with peak values of the order of 10(7) rad(2) Hz near 3.5 GHz, attributed to the diode lasers' relaxation oscillations. The measurements reveal that even at GHz frequencies diode lasers do not exhibit quantum-limited performance. The associated excess backaction can preclude ground-state cooling even in state-of-the-art nano-optomechanical systems and can, moreover, lead to noise-induced sideband asymmetries.


Published in:
New Journal Of Physics, 15
Year:
2013
Publisher:
Bristol, Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft
ISSN:
1367-2630
Laboratories:




 Record created 2013-03-28, last modified 2018-01-28


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