dc.creator Pearson, J. C. en_US dc.creator Pickett, H. M. en_US dc.creator Chen, Pin en_US dc.creator Matsuura, Shuji en_US dc.creator Blake, Geoffrey A. en_US dc.date.accessioned 2006-06-15T19:23:32Z dc.date.available 2006-06-15T19:23:32Z dc.date.issued 1999 en_US dc.identifier 1999-WF-01 en_US dc.identifier.uri http://hdl.handle.net/1811/19541 dc.description $^{a}$ Shuji Matsuura, Pin Chen, Geoffrey A. Blake, J.C. Pearson and Herbert M. Pickett, IEEE MTT, in press (1998). en_US dc.description Author Institution: Jet Propulsion Laboratory, California Institute of Technology; National Institute of Standards and Technology, Time and Frequency Division; Division of Geological and Planetary Sciences, California Institute of Technology en_US dc.description.abstract A three laser system based on 852nm DBR lasers has been constructed and used to generate radiation in the 750 GHz to 1600 GHz frequency region. The system works by locking two of the three lasers to modes of an ultra low expansion Fabry-Perot cavity. The third laser is offset locked to one of the cavity locked lasers with conventional microwave techniques. The signal from the offset laser and the other cavity locked laser are injected into a Master Oscillator Power Amplifier (MOPA), amplified and focused on a low temperature grown GaAs photomixer, which radiates the difference frequency. The system has been calibrated with molecular lines to better than one part in $10^{7a}$ In this paper we present the application of this system to the $v_{2}$ inversion band of Ammonia and the ground and $v_{2}$ states of water. A discussion of the system design, the calibration and the new spectral measurements will be presented. en_US dc.format.extent 137663 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title CONSTRUCTION AND CALIBRATION OF A DIFFERENCE FREQUENCY LASER SPECTROMETER AND NEW THZ FREQUENCY MEASUREMENTS OF WATER AND AMMONIA en_US dc.type article en_US
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