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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/150156
Thermal noise and optomechanical features in the emission of a membrane-coupled compound cavity laser diode
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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.
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BALDACCI, Lorenzo, et al. Thermal noise and optomechanical features in the emission of a membrane-coupled compound cavity laser diode. Scientific Reports. 2016. Vol. 6, num. 31489. ISSN 2045-2322. [consulted: 9 of September of 2026]. Available at: https://hdl.handle.net/2445/150156