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Extra info for Chemical Lasers

Example text

4 9 104 1 . 8 6 . 6 4. 2 9 104 140) 143) 143) CO3(001) --}- H F ( v = 0) 9 COs(nm0) + HF(v =0) a) O t h e r v a l u e s o b t a i n e d w i t h different a s s u m p t i o n s . Conventional CO~ lasers are pumped in electric discharges. The method~ described here is different in that it uses flash photolysis for initiation of the pump sequence. An important feature is t h a t one can utilize the potential of chain reactions in pumping such hybrid lasers. 6. Emission Spectra of Pulsed Chemical Lasers There is a large number of chemical laser publications that deal with the investigation of the output spectra, mostly in a rather empirical fashion.

This interpretation is supported b y the observation that at low pressures relatively good agreement is found between experiment and theory. As the pressure is raised, an abrupt levelling-off of peak intensity occurs whereas the calculations predict a continuing increase lOZ). It appears that we need a more detailed insight, both experimental and theoretical, into the coUisional and radiational rate processes. A saturated amplifier experiment should be done in order to monitor the total amount of inversion in the chemical reaction system.

Laser radiation was obtained from HF, DF, HC1, and CO. Presumably HBr, DBr, DC1, and OH will be added to this list in the near future. Some of the results according to Cool et al. are summarized in Table 14. In all cases only partial population inversions have been found under these conditions. The experimental arrangements for these lasers are not different in principle from those used for chemically pumped CO2 lasers. An interesting laser device to be mentioned here is the CO laser resulting from a free-burning additive CS2/09.

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Chemical Lasers


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