Zhang Jian-Song, Chen Ai-Xi
Opt Express. 2020 Nov 23;28(24):36620-36631. doi: 10.1364/OE.412826.
We propose a scheme to generate strong and robust mechanical squeezing in an optomechanical system in the highly unresolved sideband (HURSB) regime with the help of the Duffing nonlinearity and intracavity squeezed light. The system is formed by a standard optomechanical system with the Duffing nonlinearity (mechanical nonlinearity) and a second-order nonlinear medium (optical nonlinearity). In the resolved sideband regime, the second-order nonlinear medium may play a destructive role in the generation of mechanical squeezing. However, it can significantly increase the mechanical squeezing (larger than 3dB) in the HURSB regime when the parameters are chosen appropriately. Finally, we show the mechanical squeezing is robust against the thermal fluctuations of the mechanical resonator. The generation of large and robust mechanical squeezing in the HURSB regime is a combined effect of the mechanical and optical nonlinearities.
我们提出了一种方案，借助达芬非线性和腔内压缩光，在高度未分辨边带（HURSB） regime 的光机械系统中产生强且稳健的机械压缩。该系统由具有达芬非线性（机械非线性）的标准光机械系统和二阶非线性介质（光学非线性）组成。在分辨边带 regime 中，二阶非线性介质在机械压缩的产生中可能起破坏作用。然而，当参数选择适当时，它能在 HURSB regime 中显著增加机械压缩（大于 3dB）。最后，我们表明机械压缩对机械谐振器的热涨落具有鲁棒性。在 HURSB regime 中产生大且稳健的机械压缩是机械和光学非线性的综合效应。
