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Ultrashort pulse multichannel infrared spectrometer apparatus and method for obtaining ultrafast time resolution spectral data
Ultrashort pulse multichannel infrared spectrometer apparatus and method for obtaining ultrafast time resolution spectral data
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机译：超短脉冲多通道红外光谱仪装置及获得超快时间分辨率光谱数据的方法
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摘要
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.
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