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1343485 
Journal Article 
Tunable mid-infrared spectrometer based on KTA crystal to study fundamental nu(3) band of methane 
Bhar, GC; Kumbhakar, P; Chaudhary, AK 
2001 
Yes 
Indian Journal of Pure and Applied Physics
ISSN: 0019-5596 
39 
5 
282-285 
WOS:000168832600002 
Tunable mid-infrared radiation in the range 3-3.5 mum have
been generated by difference frequency mixing in a biaxial potassium titanyl arsenate (KTA)
crystal. The fundamental input radiations are the second harmonic of a commercially available
Nd:YAG laser radiation (i.e. 532 nm) and the same pumped visible dye laser radiation. Using the
generated tunable radiation the room temperature absorption spectra of R-branch of the nu (3)
band of methane at 120 mbar pressure have been studied. Pressure dependent absorption of P(7)
line of the nu (3) band of methane have also been studied. The absorption measurements have been
performed in an indigenously built single pass gas cell of length 33 cm.