The interference results are associated with the force and temperature fluctuation in Taiji-1. To obtain the maximum effect of these noises, the coupling noise analysis of the force and temperature on the interferometer is discussed. First, the impact mechanism of force and temperature fluctuation is introduced. Then, the mechanical and optical simulation based on a simplified model are performed in turn to get the relationship between the noises and the interference results. The final relationship indicates that coupling effect of the force and temperature fluctuations on the interference is a superposition of the results from the situation with only force or temperature fluctuation, corresponding to the respective frequencies. Based on the relationship, the final amplitudes of interference results caused by the force and temperature fluctuation are 111pm@0.1Hz and 87.47pm@0.05Hz, respectively, when the corresponding noises are 50µN@0.1Hz and 1.7mK@0.05Hz in the proposed simplified model.
Total internal reflection imaging ellipsometry (TIRIE) is widely used in the field of the biological detection due to its high sensitivity and multi-detection capability. Traditionally, the ellipsometric measurement works under the null-off null condition which is insensitive to the small interface variations such as the electron density disturbance at the sensing surface. Thus, we analyze the response of the detected signals under the different working conditions to the ellipsometric parameter variations and optimize the polarization settings to further enhance the TIRIE response to the subtle interface variation in this paper. Furthermore, the relationship between the detected signal and the electron density disturbance is obtained, and the result shows that the detection sensitivity for the subtle interface changes is improved by one hundred times under the optimized working condition.
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 <80 μrad / Hz1/2 in frequencies from 0.2 to 1 Hz, and the thermal drift is the main noise source in our recent system.
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