Feedback Enhanced Phonon Lasing of a Microwave Frequency Resonator

• URL: http://arxiv.org/abs/2308.09130v1
• Date: Thu, 17 Aug 2023 18:00:03 GMT
• Title: Feedback Enhanced Phonon Lasing of a Microwave Frequency Resonator
• Authors: Peyman Parsa, Prasoon Kumar Shandilya, David P. Lake, Matthew E. Mitchell, and Paul E. Barclay
• Abstract summary: We propose and demonstrate a feedback technique for increasing the amplitude of self-oscillating mechanical resonators. This technique will advance applications dependent on high dynamic mechanical stress, such as coherent spin-phonon coupling.
• Score: 1.027640127328754
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The amplitude of self-oscillating mechanical resonators in cavity optomechanical systems is typically limited by nonlinearities arising from the cavity's finite optical bandwidth. We propose and demonstrate a feedback technique for increasing this limit. By modulating the cavity input field with a signal derived from its output intensity, we increase the amplitude of a self-oscillating GHz frequency mechanical resonator by $22\%$ (increase in coherent phonon number of $50\%$) limited only by the achievable optomechanical cooperativity of the system. This technique will advance applications dependent on high dynamic mechanical stress, such as coherent spin-phonon coupling, as well as implementations of sensors based on self-oscillating resonators.

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