Department of Physics and Astronomy, University College London, WC1E 6BT, United Kingdom.
Phys Rev Lett. 2010 Aug 13;105(7):073002. doi: 10.1103/PhysRevLett.105.073002. Epub 2010 Aug 11.
Doppler cooling the center-of-mass motion of an optically levitated microsphere via the velocity-dependent scattering force from narrow whispering gallery mode resonances is described. Light that is red detuned from the whispering gallery mode resonance can be used to damp the center-of-mass motion in a process analogous to the Doppler cooling of atoms. The scattering force is not limited by saturation but can be controlled by the incident power. Cooling times on the order of seconds are calculated for a 20 μm diameter silica microsphere trapped within optical tweezers.
通过窄 whispering gallery 模式共振的速度相关散射力对光学悬浮微球的质心运动进行多普勒冷却的方法。从 whispering gallery 模式共振红失谐的光可用于阻尼质心运动，这一过程类似于原子的多普勒冷却。散射力不受饱和限制，而是可以通过入射功率控制。计算了在光学镊子中捕获的 20 μm 直径二氧化硅微球的冷却时间约为秒级。
