Optical design and suspension system of the KAGRA output mode-cleaner
Optical design and suspension system of the KAGRA output mode-cleaner
复制标题
KAGRA 输出模清洁器的光学设计和悬挂系统
DOI：
10.1088/1742-6596/957/1/012009
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Kentaro Somiya
中科院分区：
文献类型：
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作者：
Junko Kasuya;John Winterflood;Ju Li;Kentaro Somiya
KAGRA是一台日本大型地下低温引力望远镜，正在神冈煤矿建造中。对于低温实验质量，KAGRA的灵敏度主要受量子噪声的限制。为了减少量子噪声，KAGRA在输出端口采用了输出模式清洁器(OMC)，过滤掉垃圾光，但允许引力波信号通过。KAGRA OMC的要求甚至比世界上其他望远镜更具挑战性，因为KAGRA计划调整信号读出相位，以便我们的主要目标源的信噪比可以达到最大。适当选择光学参数和防振装置是OMC稳健运行所必需的。在这一过程中，我们展示了我们的模式模型模拟的最终结果，其中我们降低了腔长度、往返Gouy相移、精细度和悬挂光学器件的隔震比。
KAGRA is a Japanese large scale, underground, cryogenic gravitational telescope which is under construction in the Kamioka mine. For using cryogenic test masses, the sensitivity of KAGRA is limited mainly by quantum noise. In order to reduce quantum noise, KAGRA employs an output mode-cleaner (OMC) at the output port that filters out junk light but allows the gravitational wave signal to go through. The requirement of the KAGRA OMC is even more challenging than other telescopes in the world since KAGRA plans to tune the signal readout phase so that the signal-to-noise ratio for our primary target source can be maximized. A proper selection of optical parameters and anti-vibration devices is required for the robust operation of the OMC. In this proceeding, we show our final results of modal-model simulations, in which we downselected the cavity length, the round-trip Gouy phase shift, the finesse, and the seismic isolation ratio for the suspended optics.