Optical systems are often subject to parametric instability caused by the delayed response of the optical field to the system dynamics. In some cases, parasitic photothermal effects aggravate the instability by adding new interaction dynamics. This may lead to the possible insurgence or amplification of parametric gain that can further destabilize the system. In this paper, we show that the photothermal properties of an optomechanical cavity can be modified to mitigate or even completely cancel optomechanical instability. By inverting the sign of the photothermal interaction to let it cooperate with radiation pressure, we achieve control of the system dynamics to be fully balanced around a stable equilibrium point. Our study provides a feedback solution for optical control and precise metrological applications, specifically in high-sensitivity resonating systems that are particularly susceptible to parasitic photothermal effects, such as our test case of a macroscopic optical levitation setup. This passive stabilization technique is beneficial for improving system performance limited by photothermal dynamics in broad areas of optics, optomechanics, photonics, and laser technologies.

中文翻译：

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消除光谐振器中光热引起的不稳定性

光学系统经常受到由光场对系统动力学的延迟响应引起的参数不稳定性的影响。在某些情况下，寄生光热效应通过增加新的相互作用动力学来加剧不稳定性。这可能会导致参数增益的可能反叛或放大，从而进一步破坏系统的稳定性。在本文中，我们表明可以修改光机械腔的光热特性以减轻甚至完全消除光机械不稳定性。通过反转光热相互作用的符号使其与辐射压力相配合，我们实现了对系统动力学的控制，使其在稳定平衡点周围完全平衡。我们的研究为光学控制和精密计量应用提供了反馈解决方案，特别是在特别容易受到寄生光热效应影响的高灵敏度谐振系统中，例如我们的宏观光学悬浮装置的测试案例。这种被动稳定技术有利于提高光学、光机械、光子学和激光技术等广泛领域中受光热动力学限制的系统性能。