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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