Ultrashort pulse multichannel infrared spectrometer apparatus an

Details Ultrashort pulse multichannel infrared spectrometer apparatus an Ultrashort pulse multichannel infrared spectrometer apparatus an

1989-08-02

1990-12-25

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503381, G01J 342

Patent

active

049805665

ABSTRACT:
A simple, compact optical spectrometer employs solid-state nonlinear crystals for obtaining broadband multichannel infrared spectra with picosecond or femtosecond time resolution. Spectrally broad infrared pulses are produced by difference frequency mixing in a first LiIO.sub.3 crystal between the second harmonic of a picosecond Nd.sup.+3 :YAG laser and broadband output of a synchronously pumped dye laser, and a resultant broadband IR pulse is upconverted by a second LiIO.sub.3 crystal to yield a blue visible pulse which is dispersed by a 0.25 meter spectrograph onto a multichannel vidicon or reticon detector to obtain four wavenumber resolution single-shot transient infrared spectra of a sample. The present invention enables rapid acquisition of ultrashort time infrared spectra over a broadly tunable spectral range (in the mid to near infrared) at minimal cost and by a simple but versatile optical system employing readily available components.

REFERENCES:
E. J. Heilweil, R. R. Cavanagh and J. C. Stephenson, "Population Relaxation f CO(v=1) Vibrations in Solution Phase Metal Carbonyl Complexes", Chem. Phys. Lett., vols. 134, No. 2, Feb. 19, 1987, pp. 181-188.
T. M. Jedju, I. Rothberg, and A. Labrie, "Subpicosecond Time-Resolved Spectroscopy by Transient Infrared Absorption", Optics Letters, 13(11), Nov. 1988.
D. S. Moore and S. C. Schmidt, "Tunable Subpicosecond Infrared Pulse Generation to 45 um", Optics Letters, vol. 2, No. 7, Jul. 1987.
E. J. Heilweil, "Ultrashort-Pulse Multichannel Infrared Spectroscopy Using Broadband Frequency Conversion in LiIO.sub.3 ", Optics Letters, Jun. 1, 1989.

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