Optimization of a midinfrared high-resolution difference-frequency laser spectrometer

A. H. Hielscher, C. E. Miller, D. C. Bayard, U. Simon, K. P. Smolka, R. F. Curl, F. K. Tittel

Research output: Contribution to journalArticlepeer-review


Improved performance of a continuous-wave (cw) laser spectrometer for Doppler-limited infrared spectroscopy of molecules based on difference-frequency generation (DFG) in AgGaS2 has been achieved. The spectrometer was configured to generate continuous scans of up to 1 cm-1 from 1550 to 2100 cm-1. An absolute precision of ˜6 × 10-3 cm-1 with a resolution of better than 1.0 MHz (3.3 × 10-5 cm-1) was achieved. Infrared powers of ˜20 μW were obtained by employing 90° Type I phase matching in a 45-mm-long AgGaS2 crystal. The highresolution characteristics of the DFG spectrometer were evaluated by using H2O and N2O spectra. Preliminary infrared kinetic spctroscopy results involving the detection of transient CO radicals from 193-nm acetone photodissociation are also reported.

Original languageEnglish (US)
Pages (from-to)1962-1967
Number of pages6
JournalJournal of the Optical Society of America B: Optical Physics
Issue number11
StatePublished - Nov 1992

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics


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