Ontology type: schema:ScholarlyArticle
1991-05
AUTHORSG. Carelli, N. Ioli, A. Moretti, G. Moruzzi, D. Pereira, F. Strumia
ABSTRACTWe have increased the frequency tunability of our CW waveguide CO2 lasers by means of an acoustooptic amplitude modulator, operating at the fixed frequency of 90 MHz. The up-shifted, or down-shifted, laser optical sideband can be generated independently by adjusting the orientation of the modulator. The efficiency is larger than 50%. The frequency tunability of the CO2 laser around each laser line is thus increased by 180 MHz. To demonstrate the possibilities of this method, a source composed of the above modulator and of a CW, 300 MHz tunable waveguide CO2 laser has been used for the search of new large offset FIR laser lines from optically pumped CH3OH and13CH3OH molecules. As a result 15 and 10 new large offset laser lines were discovered respectively. New assignments of some laser lines are also proposed. We have also measured the Stark effect, the offset, and the polarization of other already known lines. In particular a Stark effect frequency tuning of about 1 GHz is demonstrated for a laser line at 208.399 μm. More... »
PAGES449-471
http://scigraph.springernature.com/pub.10.1007/bf01010879
DOIhttp://dx.doi.org/10.1007/bf01010879
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