Simultaneous operation of distributed feedback and grating tuned dye lasers |
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| Authors: | I Golub G Erez R Shuker |
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| Institution: | 1. Physical Chemistry Branch, Atomic Energy of Canada Limited, Research Company, Chalk River Nuclear Laboratories, K0J 1J0, Chalk River, Ontario, Canada
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| Abstract: | Multiphoton absorption (MPA) of the CO2 laser 9 μmR(30) line (pulse width 60 ns, FWHM) by NH3 and NH3/N2 mixtures was studied as a function of gas composition, pressure and laser fluence (Φ). MPA occurs for Φ smaller than those that have been used for optically pumped NH3/N2 lasers; consequently a simple two-level absorption model will not adequately describe laser action in these systems. The photon energy deposited in NH3/N2 mixtures can be calculated from the MPA cross-section and the fluence dependence of the illumination geometry. An examination of the efficiency of conversion of this absorbed energy to the reported radiant energy of optically pumped NH3/N2 lasers shows an optimum value which depends on pressure, and gas composition. |
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