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Application of Cascaded Frequency Multiplication to Molecular Spectroscopy Brian Drouin, Frank W. Maiwald, John C. Pearson Jet Propulsion Laboratory, California Institute of Technology Pasadena, CA 91109 Slide 2 June 21 st, 2005Frequency Multiplier Submillimeter Spectrometer Current Tasks Temperature dependent air-broadened linewidths for EOS-MLS Ion rest frequency measurements for APRA Updating/Upgrading the JPL millimeter/submillimeter spectral line catalog Testing/implementing new technology for spectroscopy Slide 3 June 21 st, 2005Frequency Multiplier Submillimeter Spectrometer Technique Air, N 2, O 2 Vacuum Pump O 18 O, O 2 P P coolant out coolant in RF synthesizer Lock In Amp Frequency Modulation InSb Detector PT 100 cm 5 cm DC Power Supply PC DAQ quasi-optical lens 'top-hat' window vacuum rack multiplier T 0 o C Slide 4 June 21 st, 2005Frequency Multiplier Submillimeter Spectrometer The Frequency Multiplication Submillimeter Spectrometer 83558A HP8340b SR830 M1611/2D HP FG AM/FM/TM sync InSb or Si gas pre-amp vacuum pump sample sweep synthesizer YIG filter mm-wave module MMIC amps submm multipliers waveguide feedhorns sample cell He cooled detector waveform generator lock-in-amplifier PC GPIB modulation DAQ tuning voltage Slide 5 June 21 st, 2005Frequency Multiplier Submillimeter Spectrometer Frequency Coverage millimeter 40 - 300 GHz high power sources (4 almost cover band) room temperature detectors (3-4 cover band) submillimeter 300 - 3000 GHz new fixed tuned sources multiple configurations of multipler chains/amps for comprehensive coverage through 1000 GHz and bands near 1200, 1800, 2600 GHz helium cooled detectors (InSb 1000) Slide 6 June 21 st, 2005Frequency Multiplier Submillimeter Spectrometer Broadband Frequency Coverage AMC-10 x6 0.07-0.11 THz MUTx2 0.15-0.24 THz MUTx3 0.18-0.28 THz VDI 1.9x5 0.38-0.58 THz VDI 1.5x6 0.58-0.69 THz VDI 1.2x10 0.76-0.88 THz JPL x2x2x3 0.85-0.95 THz JPL x2x2x3 1.05-1.25 THz JPL x2x3x3 1.57-1.67 THz 76.2% coverage up to 1.25 THz or 1.0 THz out of 1.6 accessible Slide 7 June 21 st, 2005Frequency Multiplier Submillimeter Spectrometer Multiplier Chains Rack containing RF Synthesizer, Function Generator, Lock-In-Amplifier & Power Supplies Sextupler and pentupler (600 GHz out) Sextupler, amplifiers, doubler, doubler, tripler (1200 GHz out) Slide 8 June 21 st, 2005Frequency Multiplier Submillimeter Spectrometer Harmonic Content VDI 1.9 x5: 98% x6 1% x7 1% VDI 1. 5 x6: 99% x4 1% VDI 1.2 x10: 100% JPL x2x2x3: >99% x2x2x2