论文标题
带有旋转型扭转型天线的耦合腔的波前传感
Wavefront Sensing with a Coupled Cavity for Torsion-Bar Antenna
论文作者
论文摘要
扭转杆天线（TOBA）是使用扭转摆的地面引力检测器。 Toba可以检测中间质量的黑洞二进制合并，引力波随机背景和牛顿噪声，并且对地震早期警告很有用。正在开发具有35 cm尺寸摆的原型检测器III型TOBA，以证明降噪。目标应变灵敏度设置为$ 1 \ times10^{ - 15} \，{/\ sqrt {\ rm hz}}} $ 0.1 Hz - 10 Hz之间。提出了一种新的带有耦合腔的波前传感方案，以测量摆旋转低至$ 5 \ times10^{ - 16} \，{{\ rm rad}/\ sqrt {\ rm sqrt {\ rm hz}}} $用于阶段-IIII toba。在我们的方法中，使用辅助腔来增强主腔中的一阶Hermite-Gaussian模式。正在进行实验演示以确认角信号扩增的可行性，并建立一种锁定耦合腔的方法。我们评估了耦合腔的性能，并得出结论，该传感器可以是可行的。耦合腔已通过磅 - 二线技术成功地锁定在两个调制频率的情况下。
Torsion-Bar Antenna (TOBA) is a ground-based gravitational wave detector using torsion pendulums. TOBA can detect intermediate-mass black hole binary mergers, gravitational wave stochastic background, and Newtonian noise, and is useful for earthquake early warning. A prototype detector Phase-III TOBA with 35 cm-scale pendulums is under development to demonstrate noise reduction. The target strain sensitivity is set to $1\times10^{-15}\,{/\sqrt{\rm Hz}}$ between 0.1 Hz--10 Hz. A new scheme of wavefront sensing with a coupled cavity was proposed to measure the pendulum rotation as low as $5\times10^{-16}\,{{\rm rad}/\sqrt{\rm Hz}}$ for Phase-III TOBA. In our method, an auxiliary cavity is used to enhance the first-order Hermite--Gaussian mode in a main cavity. Experimental demonstration is ongoing to confirm the feasibility of angular signal amplification and establish a method for locking a coupled cavity. We evaluated the performance of the coupled cavity and concluded that angular signal amplification would be feasible with this sensor. The coupled cavity was successfully locked to the resonance by the Pound--Drever--Hall technique with two modulation frequencies.
