Efficient excitation of a mesospheric sodium laser guide star by intermediate-duration pulses.

Details Efficient excitation of a mesospheric sodium laser guide star by intermediate-duration pulses. Efficient excitation of a mesospheric sodium laser guide star by intermediate-duration pulses.

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994josaa..11..832m&link_type=abstract

Journal of the Optical Society of America A, Vol. 11, No. 2, p. 832 - 845

Physics

Optics

15

Adaptive Optics: Guide Stars

Scientific paper

Calculations of backscatter emission of mesospheric sodium atoms in a laser guide star that is excited by pulses ranging from 30-ns to 0.9-μs duration are described. As expected, circular polarization produced more backscatter than did linear polarization, but the enhancement never exceeded 1/3 in the calculations that are reported. A brief estimate of state precession in the Earth's magnetic field suggests that achieving even this enhancement will require that the time scale for optical pumping be held to less than 1 μs, which will require the use of irradiances greater than 0.7 W/cm2 and spectral coverage of the full 3-GHz hyperfine-plus-Doppler absorption profile, at least until most of the population is pumped out of the F = 1 ground states.

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