Thermal noise and optomechanical features in the emission of a membrane-coupled compound cavity laser diode

Lorenzo Baldacci; Alessandro Pitanti; Luca Masini; Andrea Arcangeli; Francesco Colangelo; Daniel Navarro-Urrios; Alessandro Tredicucci

arXiv · 1602.08453

Thermal noise and optomechanical features in the emission of a membrane-coupled compound cavity laser diode

Lorenzo Baldacci·Alessandro Pitanti·Luca Masini·Andrea Arcangeli·Francesco Colangelo·Daniel Navarro-Urrios·Alessandro Tredicucci

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Abstract

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 ($\sim 3.4\cdot 10^4$ at $8.3 \cdot 10^{-3}$ mbar) of the fundamental mechanical mode at $\sim 73$ kHz guarantees a detection sensitivity high enough for direct measurement of thermal motion at room temperature ($\sim 87$ 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.

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Lorenzo Baldacci, Alessandro Pitanti, Luca Masini, Andrea Arcangeli, Francesco Colangelo, Daniel Navarro-Urrios, Alessandro Tredicucci. 2016-02-26. Thermal noise and optomechanical features in the emission of a membrane-coupled compound cavity laser diode. https://arxiv.org/abs/1602.08453

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