Rivière R, Arcizet O, Schliesser A, Kippenberg T J
École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.
Rev Sci Instrum. 2013 Apr;84(4):043108. doi: 10.1063/1.4801456.
We developed an apparatus to couple a 50-μm diameter whispering-gallery silica microtoroidal resonator in a helium-4 cryostat using a straight optical tapered-fiber at 1550 nm wavelength. On a top-loading probe specifically adapted for increased mechanical stability, we use a specifically-developed "cryotaper" to optically probe the cavity, allowing thus to record the calibrated mechanical spectrum of the optomechanical system at low temperatures. We then demonstrate excellent thermalization of a 63-MHz mechanical mode of a toroidal resonator down to the cryostat's base temperature of 1.65 K, thereby proving the viability of the cryogenic refrigeration via heat conduction through static low-pressure exchange gas. In the context of optomechanics, we therefore provide a versatile and powerful tool with state-of-the-art performances in optical coupling efficiency, mechanical stability, and cryogenic cooling.
我们开发了一种装置，用于在氦 - 4低温恒温器中，使用一根1550纳米波长的直光学锥形光纤，耦合直径为50微米的回音壁式二氧化硅微环谐振器。在一个专门为提高机械稳定性而设计的顶部加载探针上，我们使用一种专门开发的“低温锥形光纤”对腔进行光学探测，从而能够在低温下记录光机械系统的校准机械频谱。然后，我们展示了环形谐振器63兆赫兹机械模式在低温恒温器1.65 K的基础温度下实现了出色的热化，从而证明了通过静态低压交换气体进行热传导的低温制冷的可行性。因此，在光机械学领域，我们提供了一种在光学耦合效率、机械稳定性和低温冷却方面具有先进性能的通用且强大的工具。
