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Development of Local Oscillators for CASIMIR



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21ST INTERNATIONAL SYMPOSIUM ON SPACE TERAHERTZ TECHNOLOGY OXFORD 23 25 MARCH 2010 Development of Local Oscillators for CASIMIR R Lin B Thomas J Ward1 A Maestrini2 E Schlecht G Chattopadhyay J Gill C Lee S Sin F Maiwald and I Mehdi Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena CA 91101 USA Email Robert H Lin jpl nasa gov 1 now with Raytheon Company Fort Wayne Indiana 2 Observatoire de Paris LERMA University P M Curie Paris VI 77 Avenue Denfert Rochereau 75014 Paris France Abstract We present the development of three local oscillator chains to be used on the CASIMIR Caltech Airborne Submillimeter Interstellar Medium Investigations Receiver instrument onboard the SOFIA Stratospheric Observatory for Infrared Astronomy aircraft All three chains use all solidstate GaAs based components to amplify and multiply a 1 3 mW input signal at W band At room temperature the 900 GHz source produces 50 100 W of power from 800 to 930 GHz The 1 THz source produces 50 120 W of power from 960 to 1045 GHz The 1 4 THz source produces 10 70 W of power from 1320 to 1470 GHz When cooled to 120 K the 1 4 THz chain s output power increases by approximately 3 dB with a peak power of 129 W at 1395 GHz II 900 GHZ LO CHAIN The 900 GHz LO is driven by a few milliwatts of power in the 88 105 GHz range Three cascaded power amplifiers amplify the input signal to 100 mW This is then followed by a wideband isolator built by Millitech and two stages of frequency triplers as shown in Fig 1 x3 x3 Index Terms CASIMIR local oscillator terahertz source frequency multiplier cascaded multipliers GaAs Schottky diode submillimeter wavelengths I INTRODUCTION The Caltech Airborne Submillimeter Interstellar Medium Investigations Receiver CASIMIR is a multi band far infrared and submillimeter high resolution heterodyne spectrometer designed for high sensitivity observations of warm interstellar gas 1 Multiple bands are being developed to study the transition lines of



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