Abstract
The telescope is vital for accurate gravitational wave detection in the TianQin project. It must meet criteria like a geometric tilt-to-length (TTL) coupling noise ${\rm coefficient} \;{\le} {0.02}\surd {2}\;{\rm nm/\unicode{x00B5}rad}$ and wavefront ${\rm RMS} \le \lambda /{30}$. Analyzing the pupil aberration’s impact on geometric TTL noise, we devised an optimization method using the chief ray spot diagram’s standard deviation. Implementing this in Zemax with a ZPL macro, we designed an optical system meeting TianQin’s requirements. The system has a maximum geometric TTL noise coefficient of 0.0250 nm/µrad over the science FOV and a wavefront RMS of ${0.0111}\lambda$, confirming the method’s feasibility.
© 2024 Optica Publishing Group
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