用于未来升级引力波探测器的降频臂长稳定化实验演示
Experimental demonstration of frequency downconverted arm length stabilization for a future upgraded gravitational wave detector
AI总结：
针对传统倍频532nm光的臂长稳定（ALS）系统无法适配AlGaAs涂层的问题，研究人员提出并实验演示了一种兼容AlGaAs涂层的新型ALS方案，为未来引力波探测器应用该涂层提升灵敏度提供了支撑。
摘要：
地基激光干涉引力波探测器由复杂的多光腔系统构成。臂长稳定（ALS）系统在使这类复杂探测器进入运行状态、提升运行占空比方面发挥着重要作用。若降低测试质量镜涂层的热噪声，这类探测器的灵敏度可得到提升。晶体AlGaAs涂层是实现这一目标的极具潜力的候选方案。但由于GaAs的窄带隙特性，传统采用倍频532 nm光的ALS系统无法适配AlGaAs涂层，因此必须开发替代锁定方案。在这篇快报中，我们介绍了一种与AlGaAs涂层兼容的新型ALS方案的实验演示。该ALS方案将支撑AlGaAs涂层的应用，助力提升未来探测器的灵敏度。
英文摘要：
Ground-based laser interferometric gravitational wave detectors consist of complex multiple optical cavity systems. An arm-length stabilization (ALS) system has played an important role in bringing such complex detector into operational state and enhance the duty cycle. The sensitivity of these detectors can be improved if the thermal noise of their test mass mirror coatings is reduced. Crystalline AlGaAs coatings are a promising candidate for this. However, traditional ALS system with frequency-doubled 532 nm light is no longer an option with AlGaAs coatings due to the narrow bandgap of GaAs, thus alternative locking schemes must be developed. In this letter, we describe an experimental demonstration of a novel ALS scheme which is compatible with AlGaAs coatings. This ALS scheme will enable the use of AlGaAs coatings and contribute to improved sensitivity of future detectors.
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