Títol:
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Thermal noise and optomechanical features in the emission of a membrane-coupled compound cavity laser diode
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Autor/a:
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Baldacci, Lorenzo; Pitanti, Alessandro; Masini, Luca; Arcangeli, Andrea; Colangelo, Francesco; Navarro Urrios, Daniel; Tredicucci, Alessandro
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Abstract:
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We demonstrate the use of a compound optical cavity as linear displacement detector, by measuring the thermal motion of a silicon nitride suspended membrane acting as the external mirror of a nearinfrared Littrow laser diode. Fluctuations in the laser optical power induced by the membrane vibrations are collected by a photodiode integrated within the laser, and then measured with a spectrum analyzer. The dynamics of the membrane driven by a piezoelectric actuator is investigated as a function of air pressure and actuator displacement in a homodyne configuration. The high Q-factor (~3.4·104 at 8.3·10−3mbar) of the fundamental mechanical mode at ~73kHz guarantees a detection sensitivity high enough for direct measurement of thermal motion at room temperature (~87pm RMS). The compound cavity system here introduced can be employed as a table-top, cost-effective linear displacement detector for cavity optomechanics. Furthermore, thanks to the strong optical nonlinearities of the laser compound cavity, these systems open new perspectives in the study of non-Markovian quantum properties at the mesoscale. |
Matèries:
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-Materials làser -Òptica -Laser materials -Optics |
Drets:
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cc-by (c) Baldacci, Lorenzo et al., 2016
http://creativecommons.org/licenses/by/3.0/es |
Tipus de document:
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Article Article - Versió publicada |
Publicat per:
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Nature Publishing Group
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