Thermal noise and optomechanical features in the emission of a membrane-coupled compound cavity laser diode
Baldacci, Lorenzo (Istituto Nanoscienze and Scuola Normale Superiore)
Pitanti, Alessandro (Istituto Nanoscienze and Scuola Normale Superiore)
Masini, Luca (Istituto Nanoscienze and Scuola Normale Superiore)
Arcangeli, Andrea (Istituto Nanoscienze and Scuola Normale Superiore)
Colangelo, Francesco (Istituto Nanoscienze and Scuola Normale Superiore)
Navarro Urrios, Daniel (Institut Català de Nanociència i Nanotecnologia)
Tredicucci, Alessandro (Università di Pisa. Istituto Nanoscienze and Dipartimento di Fisica)

Data:	2016
Resum:	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 near-infrared 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 · 10 4 at 8. 3 · 10 −3 mbar) of the fundamental mechanical mode at ~73 kHz guarantees a detection sensitivity high enough for direct measurement of thermal motion at room temperature (~87 pm 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.
Ajuts:	European Commission 321122
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Scientific reports, Vol. 6 (August 2016) , art. 31489, ISSN 2045-2322

DOI: 10.1038/srep31489
PMID: 27538586

7 p, 684.4 KB

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