Optika Atmosfery i Okeana Journal

Vol. 13, issue 11, article # 1

Asiptsov O. I., Zakharov V. I., Gribanov K. G. Explosive absorption of СО₂-laser radiation in the mixture of atmospheric air with carbon dioxide. // Atmospheric and oceanic optics. 2000. V. 13. No. 11. P. 905-908. PDF
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Abstract:

Absorption of 35 W СО₂ laser radiation is studied for the case of the laser beam focusing in an optical cell filled with a mixture of atmospheric air of room temperature and carbon dioxide of varying concentration (from 1 to 100%). The temperature of the gas mixture in a focal zone was controlled by the shift of interference fringes in a Mach-Zehnder interferometer based on a He-Ne laser. The interferometer was designed so that one its arm crossed the focus of the CO₂-laser beam. At the carbon dioxide concentration higher than 20%, the mixture warms significantly (up to 600 K) in the focal zone, what can be explained by the effect of explosive absorption as the concentration of carbon dioxide achieves some critical value.