Laser frequency combs for precision astrophysical spectroscopy
Author(s)Li, Chih-Hao; Benedick, Andrew J.; Cramer, Claire E.; Chang, Guoqing; Chen, Li-Jin; Fendel, Peter; Furesz, Gabor; Glenday, Alexander G.; Kaertner, Franz X.; Phillips, David E.; Sasselov, Dimitar; Szentgyorgyi, Andrew; Walsworth, Ronald L.; ... Show more Show less
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Searches for extrasolar planets using the periodic Doppler shift of stellar spectral lines resulting from the motion of the host star around the barycentre of an extrasolar system have recently achieved a precision of 60 cm/s. To find a 1-Earth-mass planet in an Earth-like orbit, a precision of 5 cm/s is necessary. The sensitivity of astrophysical spectroscopy is presently limited by its wavelength calibration sources. The combination of a laser frequency comb with a Fabry-Perot (FP) filter cavity has been suggested as a promising approach to improved sensitivity. The paper reports on the fabrication and tests of a filtered comb with up to 40-GHz (~ 1 Aring) line spacing, generated from a 1 - GHz repetition-rate source, without compromising long-term stability, reproducibility or spectral resolution. This astro-comb is well matched to the resolving power of high-resolution astrophysical spectrographs. The astro-comb should allow a precision as high as 1 cm/s in astronomical radial velocity measurements.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics
Proceedings of the European Conference on Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009.
Institute of Electrical and Electronics Engineers
Chih-Hao Li et al. “Laser frequency combs for precision astrophysical spectroscopy.” Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on. 2009. 1. © Copyright 2010 IEEE
Final published version
INSPEC Accession Number: 10833785