A domestic space-borne transportable FP cavity is designed. The cavity length is 100 mm with the shape of a cube. Spacer is made of ultra-low expansion glass. This cavity is four-point mounting and heat insulated from external environmental fluctuation. To judge the performance of this cavity, an ultra-stable laser based on this cavity was constructed, the frequency noise of which is below 30Hz/√ Hz, which can fulfill the requirements of the Taiji-2 mission.
In this paper, the influence of the noise and acquisition device resolution of the system is researched on Homodyne Interferometric Angle Measurement Based on Ellipse Fitting. The research method combining data simulation and experimental verification is adopted. The influence of noise and acquisition resolution on the angular resolution is obtained by comparing the experimental and simulation results. The experimental verification results are consistent with the data simulation results. The system angle measurement resolution reaches 10-5 rad, and the system noise error is between 3%- 8%.
Ultra-stable lasers (USLs) based on Fabry-Perot (FP) cavities frequency stabilization take TEM00 mode as the reference frequency. When the laser does not match the FP cavity perfectly, high-order modes will be excited, affecting the performance of USLs. In this paper, influence of different laser alignment conditions on resonant modes of a FP cavity was numerically analyzed using Optical Simulation Containing Ansys Results (OSCAR) code. The relationship between energies of resonant modes and different laser incident conditions was revealed. The results can be a guide for aligning lasers and FP cavities.
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