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Takano Shuro, Akitoshi Ueda, Takashi Yamamoto, Shinichiro Asayama, Yutaro Sekimoto, Takashi Noguchi, Masato Ishiguro, Hidehiko Takara, Satoki Kawanishi, Hiroshi Ito, Akihiko Hirata, Tadao Nagatsuma, The First Radioastronomical Observation with Photonic Local Oscillator, Publications of the Astronomical Society of Japan, Volume 55, Issue 4, 25 August 2003, Pages L53–L56, https://doi.org/10.1093/pasj/55.4.L53
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Abstract
We present the results of experimental radioastronomical observations of an interstellar molecular spectral line with an SIS (superconductor–insulator–superconductor) receiver pumped by a photonic local oscillator (LO). A millimeter-wave LO signal was generated by feeding an optical comb signal into a W-band (75–110 GHz) photomixer using a uni-traveling-carrier photodiode (UTC-PD). A CS |$J = 2 \hbox{--} 1$| line at 98 GHz was observed toward a high-mass star-forming region W 51 (|$\mathrm{H}_2 \mathrm{O}$|). We compared the obtained spectra with those obtained with a conventional Gunn oscillator as an LO. As a result, the line parameters, such as the width, intensity, and frequency, were consistent with each other. The results presented here show that the photonic LO is a very promising source for heterodyne receivers in millimeter–and submillimeter-wave astronomy.