Stimulated Stokes downconversion in liquid and solid parahydrogen

McCall, B. J.; Huneycutt, A. J.; Saykally, R. J.; Lindsay, C. M.; Oka, T.; Fushitani, M.; Miyamoto, Y.; Momose, T.
March 2003
Applied Physics Letters;3/3/2003, Vol. 82 Issue 9, p1350
Academic Journal
We report the results of our preliminary investigations into the suitability of condensed-phase parahydrogen as a Raman-shifting medium for infrared cavity ringdown laser absorption spectroscopy. We have observed the conversion of ∼10-ns pulses of 532-nm radiation into first-, second-, and third-order vibrational Stokes radiation in bulk liquid and solid parahydrogen after a single 11-cm pass. Unexpectedly, we find that liquid H[sub 2] yields more efficient conversion than solid H[sub 2] with certain focal geometries, and that in the case of the solid, a collimated or loosely focused pump geometry is more efficient than a tight focus.


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