Principle demonstration of the phase locking based on the electro-optic modulator for Taiji space gravitational wave detection pathfinder mission

Weak-light phase locking is a key technology for Taiji space gravitational wave detection and its pathfinder mission. Previously, the phase locking was achieved by a complicated technique, which controls the frequency of the laser via a piezo-electric actuator (kHz range or more) and a temperature actuator (sub-Hz range). We propose an easy phase-locking strategy, which is based on the electro-optic modulator (EOM). Compared with the traditional way, this strategy only needs to modulate the driven voltage of the EOM, and the frequency bandwidth can cover all ranges. An experiment is also established to prove the feasibility of the method. The results show that the noises are &lt;80 mu rad/Hz(1/2) in frequencies from 0.2 to 1 Hz, and the thermal drift is the main noise source in our recent system. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)</p

星间激光干涉测量系统分析与设计

中低频(0.1mHz~1Hz)引力波源,有更深刻的宇宙学和天文学意义。美国国家科学研究委员会(NRC)在多个报告中均指出:“直接探测到中低频引力波将是诺贝尔奖量级的重大发现”。探测这个频段的波源需要摆脱地面噪声和地面实验尺度的限制,在太空实现十万或百万千米臂长的精密激光干涉测量

引力、引力波和引力波探测

引力是自然界中四种基本相互作用力之一，也是最早被人类认识的基本相互作用力。牛顿被苹果砸中发现万有引力定律的故事想必大家都不陌生，其实，引力的想法最早可追溯到伽利略，但真正被系统性地提出是在1687年，源自牛顿撰写的《自然哲学的数学原理》。其他三种基本作用力——电磁力、弱力和强力，在量子理论出现后，在标准粒子模型的框架下获得了统一。很多科学家，包括爱因斯坦在内，都试图构建一个大统一理论，将引力也统一进去。但遗憾的是，到目前为止都未获成功。从这个意义上说，引力虽然最早被人类认识，但也是认识得最不清楚的基本作用力

引力波成为探秘“黑洞”的一把钥匙

在日前召开的空间激光干涉引力波天线第十四届国际年会上,笔者受邀作“空间引力波探测太极计划及其进展”特邀报告,向世界展示了中国科学院力学研究所最新研制的全功能空间引力波探测激光干涉仪原理样机

Optimization Design of Decimation Filter for the Phasemeter in the Space Gravitational Wave Detection

In space gravitational wave detection (SGWD), the cascaded integrator-comb (CIC) antialiasing filter is always utilized for the down-sampling of the phasemeter. However, the passband of the CIC filter is not flat, which means that the attenuation is not the same at different frequencies. Therefore, in fields that require high accuracy of phase true value, such as differential wavefront sensing (DWS), the traditional down-sampling method is not applicable. In this article, the filter of CIC-interpolated second-order polynomials (ISOP) architecture is developed for the compensation of the attenuation effect. A phasemeter is also developed for the experimental demonstration. The results show that the passband attenuation at 1 Hz reduces from 0.1076 to 3.86 X 10(-4) dB , significantly reducing the droop in the passband. The noise performance of the phasemeter is also tested, which can reach the level of 2 pi mu rad/Hz(1/2 )

激光干涉引力波空间阵列核心问题的综合讨论

空间激光干涉引力波探测计划,例如欧洲航天局主导和美国参加的LISA(Laser Interferometer Space Antenna)计划、中国的“太极”计划和“天琴”计划等,瞄准中低频段(0.1 mHz~1 Hz)的引力波波源.这个频段的引力波事件被认为具有更重要的天文学、宇宙学以及物理学意义,其典型的波源包括超大(和中等)质量黑洞双星的并合、极端(和中等)质量比黑洞双星的绕转、银河系内数以百万计的致密双星系统以及随机引力波背景等