Observation of optical torsional stiffness in a high optical power cavity

Yaohui Fan; Merrill, Lucienne; Chunnong Zhao; Li Ju; Blair, David; Slagmolen, Bram; Hosken, David; Brooks, Aidan; Veitch, Peter; Mudge, Damien; Munch, Jesper
February 2009
Applied Physics Letters;2/23/2009, Vol. 94 Issue 8, p081105
Academic Journal
We have observed negative optical torsional rigidity in an 80 m suspended high optical power cavity that would induce the Sidles–Sigg instability as a result of sufficient circulating power. The magnitude of the negative optical spring constant per unit power is a few μN m/W as the result of the optical torsional stiffness in the yaw mode of a suspended mirror Fabry–Pérot cavity. It has been observed to depend on the g-factor of the cavity which is in agreement with the Sidles–Sigg theory.


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