光直接放大声音
Direct Amplification of Sound By Light
摘要：
介绍了一种新型的光声参量放大器（OAPA），它类似于光参量放大器（OPA）。光在声谐振器的反射表面上的辐射压力反应提供类似于OPA中的克尔效应的非线性。OAPA可以调整为在两种制度下运作。在正增益状态中，声学信号被直接放大。在负增益区，我们证明了声谐振器可以被冷却到量子基态。
英文摘要：
A new device, the opto-acoustic parametric amplifier (OAPA), is introduced, which is analogous to an optical parametric amplifier (OPA). The radiation pressure reaction of light on the reflective surface of an acoustic resonator provides nonlinearity similar to the Kerr effect in the OPA. The OAPA can be tuned to operate in two regimes. In the positive gain regime, an acoustic signal is directly amplified. In the negative gain regime, we show that the acoustic resonator can be cooled to the quantum ground state.
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