Phonon Laser Action in a Tunable Two-Level System
Phonon Laser Action in a Tunable Two-Level System
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DOI：
10.1103/physrevlett.104.083901
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发表时间：
2010-02-26
影响因子：
8.6
通讯作者：
Vahala, Kerry J.
中科院分区：
文献类型：
--
作者：
Grudinin, Ivan S.;Lee, Hansuek;Vahala, Kerry J.
长期以来，光学激光器的声子模拟一直是人们感兴趣的主题。我们展示了一个复合微腔系统，与射频机械模式相耦合，其工作方式与两能级激光系统非常相似。反转产生增益，导致声子激光作用于泵浦功率阈值约7微瓦以上。该设备具有连续可调的增益谱，可以选择性地放大从射频到微波率的机械模式。被视为布里渊过程，该系统进入一个区域，在该区域中，声子扮演传统上的斯托克斯波的角色。出于这个原因，还应该有可能在声子激光和光子激光之间可控地切换。机械模式的冷却也是可能的。
The phonon analog of an optical laser has long been a subject of interest. We demonstrate a compound microcavity system, coupled to a radio-frequency mechanical mode, that operates in close analogy to a two-level laser system. An inversion produces gain, causing phonon laser action above a pump power threshold of around 7 mu W. The device features a continuously tunable gain spectrum to selectively amplify mechanical modes from radio frequency to microwave rates. Viewed as a Brillouin process, the system accesses a regime in which the phonon plays what has traditionally been the role of the Stokes wave. For this reason, it should also be possible to controllably switch between phonon and photon laser regimes. Cooling of the mechanical mode is also possible.