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Proceedings Paper

Coherent Spectrophotometer In The 1.45-20 µm Range: Operation And Performance
Author(s): A. Bianchi; A. Ferrario; M. Garbi; P. L. Pizzolati
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Paper 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.

Paper Details

Date Published: 15 May 1981
PDF: 4 pages
Proc. SPIE 0236, 1980 European Conf on Optical Systems and Applications, (15 May 1981); doi: 10.1117/12.958980
Show Author Affiliations
A. Bianchi, CISE (Italy)
A. Ferrario, CISE (Italy)
M. Garbi, CISE (Italy)
P. L. Pizzolati, CISE (Italy)

Published in SPIE Proceedings Vol. 0236:
1980 European Conf on Optical Systems and Applications
D. J. Kroon, Editor(s)

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