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Additional info for Chemical Lasers
The importance of deactivation mechanisms differs for the zero power case and during lasing. 6 kcal is channeled into vibrational excitation of H F (v) (compare Table 2). 1 kcal is available as vibrational energy. 7% of the chemical energy of the chain is converted to vibrational energy. Obviously not all of this energy could be extracted as laser radiation. However, in the computations considered here an efficiency of N 2 0 % was found to be possible. It is somewhat difficult to compare these predictions with experimental results since no reMly systematic experimental study has yet been published.
49 Specific Chemical Laser S y s t e m s Table 12. ~. 7. Continuous Operation of Chemical Lasers Earlier than with pulsed chemical lasers, the first technological breakthrough in chemical lasers occurred for continuous-wave lasers. Almost simultaneously in 1968 two groups successfully operated continuous-wave chemical lasers. One was at the Aerospace Corporation headed by T. A. Jacobs 75) the other one at Cornell University under T. A. Cool 76). One of these lasers was an H F laser; the other was that is now called a hybrid chemical laser, being pumped by energy transfer rather than by a direct chemical reaction.
I can be increased deliberately if an intense stimulating radiation field can be provided, for instance b y an external laser source. This would suggest that such a photorecombination system should be operated as an amplifier rather than as an oscillator in order to demonstrate optical gain. In such a laser the increasing radiation intensity speeds up not only the stimulated transitions but also the reaction itself. So far, preassociation and the possibility of photorecombinative laser action have been investigated in the formation of NO 86,88), N2 ss), CN ss) and the halogens ST}.