Physics
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62..993s&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 11, p. 993-997.
Physics
Scientific paper
An estimation of population inversion for the (0001) and (1000) states of the CO2 molecule in the Earth's atmosphere is presented. The evaluation shows the inversion to occur near a height of 95-100 km in daytime. The principal source of the (0001) state pumping is the absorption of solar radiation in the 4.3μm CO2 band. The collisional transfer of energy from O(1D) atoms to the (0001) state amplifies the inversion significantly. The maximum value of ([CO2(0001)]- [CO2(1000)])/[CO2(1000)] cannot be less than /~0.2. However, the maximum order of the total directional gain for laser emission in the 10.4μm CO2 band along the tangent path was found to be small, it varies from 0.3×10-5 to 10-5 depending mainly on the extent to which the O(1D) source contributes to (0001) state pumping. The utilization of the natural inversion could be possible by forming a lasing cavity with orbiting mirrors should the engineering problem associated with the slow accumulation of electromagnetic wave energy in the cavity be solved.
Ogibalov Vladimir P.
Shved Gustav M.
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