The First Radioastronomical Observation with Photonic Local Oscillator

Details The First Radioastronomical Observation with Photonic Local Oscillator The First Radioastronomical Observation with Photonic Local Oscillator

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasj...55l..53t&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.55, No.4, pp. L53-L56

Astronomy and Astrophysics

Astronomy

4

Instrumentation: Miscellaneous, Ism: Individual (W 51), Ism: Molecules, Radio Lines: Ism

Scientific paper

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 (75-110GHz) photomixer using a uni-traveling-carrier photodiode (UTC-PD). A CS J = 2 - 1 line at 98GHz was observed toward a high-mass star-forming region W 51 (H2O). 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.

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