Coherent Spectrophotometer In The 1.45-20 Âµm Range: Operation And Performance

A. Bianchi; A. Ferrario; M. Garbi; P. L. Pizzolati

doi:10.1117/12.958980

15 May 1981 Coherent Spectrophotometer In The 1.45-20μm Range: Operation And Performance

A. Bianchi, A. Ferrario, M. Garbi, P. L. Pizzolati

Proceedings Volume 0236, 1980 European Conf on Optical Systems and Applications; (1981) https://doi.org/10.1117/12.958980
Event: 1980 European Conference on Optical Systems and Applications, 1980, Utrecht, Netherlands

Abstract

We describe a coherent spectrophotometer tunable in the 1.45-20 μm range; the source is a LiNb0₃ optical parametric oscillator pumped by Nd-YAG laser, and AgGaSe₂, GaSe or CdSe crystals as down converter of the idler and signal beams. The LiNb03 optical parametric oscillator is tunable in the 1.5-4 μm range, the peak power is higher than 200 kW and the bandwidth is 0.15 cm^-1. Using a GaSe crystal we obtained a peak power better than 1 kW also in the 4-12 μm range. Using a 3.1 cm long CdSe crystal, we also obtain the down-conversion of the parametric output beams. The tunability is in the 9.5-20 μm range, and the bandwidth is 0.2 cm^-1. An electronic system supplies feed-forward tuning control, output light detec-tion and absorption coefficient measurements. Tuning control is obtained by simultaneous variations of grating, LiNb03 crystal, mixer crystal and mirror angles with respect to the light beam. Further control for etalon tuning is provided. Pyroelectric detectors are used to obtain light detections and measurements on both light paths (reference and sample under test) and active filter amplifiers supplies signal to noise ratio improvement before A/D conversion.

Citation Download Citation

A. Bianchi, A. Ferrario, M. Garbi, and P. L. Pizzolati "Coherent Spectrophotometer In The 1.45-20μm Range: Operation And Performance", Proc. SPIE 0236, 1980 European Conf on Optical Systems and Applications, (15 May 1981); https://doi.org/10.1117/12.958980

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