高Q值扭秤振荡器的光机多稳态观测
Observation of opto-mechanical multistability in a high Q torsion balance oscillator
摘要：
我们观察到宏观扭秤振荡器的光机多稳态。扭转振子构成半球形激光腔的动镜。当激光束耦合到该腔中时，腔内光束的辐射压力增加到扭转丝的回复力，形成光机械势。在没有光学阻尼的情况下，由于在4微米振荡器位移的范围内的局部光势最小值，观察到多达23个稳定的捕获区域。这些捕获位置中的每一个都表现出光学弹簧特性。还观察到相邻捕获位置之间的滞后行为。以提高重力实验中的信噪比为目标，讨论了光机随机共振观测的前景。
英文摘要：
We observe the opto-mechanical multistability of a macroscopic torsion balance oscillator. The torsion oscillator forms the moving mirror of a hemi-spherical laser light cavity. When a laser beam is coupled into this cavity, the radiation pressure force of the intra-cavity beam adds to the torsion wire's restoring force, forming an opto-mechanical potential. In the absence of optical damping, up to 23 stable trapping regions were observed due to local light potential minima over a range of 4 micrometer oscillator displacement. Each of these trapping positions exhibits optical spring properties. Hysteresis behavior between neighboring trapping positions is also observed. We discuss the prospect of observing opto-mechanical stochastic resonance, aiming at enhancing the signal-to-noise ratio (SNR) in gravity experiments.
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