Modifying Test-Mass Dynamics: Double Optical Spring
In this chapter, we will discuss the approach to surpassing the free-mass Standard Quantum Limit (SQL) by modifying the the test-mass dynamics with double optical springs. We explore the frequency dependence of the optical spring effect. In particular, we show that the frequency dependence of double optical springs allows us to create a “negative inertia”, which cancels the positive inertia of the test-mass with the mechanical response significantly enhanced.
KeywordsTest Mass Friction Term Feedback Control Method Standard Quantum Limit Intracavity Power
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