On obtaining well defined transverse modes and selective line tuning of a long CW CO2 laser

Kukreja, M. ; Sehgal, S. K. ; Chatterjee, U. K. ; Bhawalkar, D. D. (1986) On obtaining well defined transverse modes and selective line tuning of a long CW CO2 laser Journal of Physics D: Applied Physics, 19 (3). pp. 417-425. ISSN 0022-3727

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Official URL: http://iopscience.iop.org/0022-3727/19/3/011?fromS...

Related URL: http://dx.doi.org/10.1088/0022-3727/19/3/011

Abstract

It is found that a long conventional CW CO2 laser cannot be tuned selectively because of the multidirectional modes formed through reflections at grazing angles from the inner walls of the discharge tubes. This problem has been overcome by inserting a number of properly designed mode-selecting apertures right into the discharge tubes and selective tuning over more than 150 rotational lines in both P and R branches of three vibrational bands (9.6, 10.6 and 11.2 mu m) has been achieved. The rotational lines of higher J-values that have a low gain tend to lase in the TEM10 mode. In the R branch two consecutive lines are observed to lase simultaneously when the angular width of the active medium subtended at the grating allows the existence of two physically tilted beams of different wavelengths dispersed by the grating used. The output power distribution over various lines almost follows that of the gain. The optimum design parameters of a long CW CO2 laser for tuning are obtained.

Item Type:Article
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ID Code:3350
Deposited On:11 Oct 2010 09:01
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