10 September 2009 Monolithic interferometer for high precision radial velocity measurements
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Abstract
In high precision radial velocity (RV) measurements for extrasolar planets searching and studies, a stable wide field Michelson interferometer is very critical in Exoplanet Tracker (ET) instruments. Adopting a new design, monolithic interferometers are homogenous and continuous in thermal expansion, and field compensation and thermal compensation are both satisfied. Interferometer design and fabrication are decrypted in details. In performance evaluations, field angle is typically 22° and thermal sensitivity is typically -1.7 x 10-6/°C, which corresponds to ~500 m/s /°C in RV scale. In interferometer stability monitoring using a wavelength stabilized laser source, phase shift data was continuously recorded for nearly seven days. Appling a frequent calibration every 30 minutes as in typical star observations, the interferometer instability contributes less than 1.4 m/s in RV error, in a conservative estimation.
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Xiaoke Wan, Xiaoke Wan, Jian Ge, Jian Ge, Ji Wang, Ji Wang, Brian Lee, Brian Lee, } "Monolithic interferometer for high precision radial velocity measurements", Proc. SPIE 7424, Advances in Optomechanics, 742406 (10 September 2009); doi: 10.1117/12.825747; https://doi.org/10.1117/12.825747
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