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- W2019866417 abstract "A program to compute the two-step excitation of sodium atoms (3S1/2→3P3/2→4D5/2) using the density-matrix formalism is presented. The BEACON program calculates population evolution and the number of photons emitted by fluorescence from the 3P3/2, 4D5/2, 4P3/2, 4S1/2 levels. Title of program: BEACON Catalogue identifier:ADSX Program Summary URL: http://cpc.cs.qub.ac.uk/cpc/summaries/ADSX Program obtainable from: CPC Program Library, Queen's University of Belfast, N. Ireland Licensing provisions: none Operating systems under which the program has been tested: Win; Unix Programming language used: FORTRAN 77 Memory required to execute with typical data: 1 Mw Number of bits in a word: 32 Number of processors used: 1 (a parallel version of this code is also available and can be obtained on request) Number of lines in distributed program, including test data, etc.: 29 287 Number of bytes in distributed program, including test data, etc.: 830 331 Distribution format: tar.gz CPC Program Library subprograms used: none Nature of physical problem: Resolution of the Bloch equations in the case of the two-step laser excitation of sodium atoms. Method of solution: The program BEACON calculates the evolution of level population versus time using the density-matrix formalism. The number of photons emitted from the 3P3/2, 4D5/2 and 4P3/2 levels is calculated using the branching ratios and the level lifetimes. Restriction on the complexity of the problem: Since the backscatter emission is calculated after the excitation process, excitation with laser pulse duration longer than the 4D5/2 level lifetime cannot be rigorously treated. Particularly, cw laser excitation cannot be calculated with this code. Typical running time:12 h" @default.
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- W2019866417 date "2004-09-01" @default.
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- W2019866417 title "A program to compute the two-step excitation of mesospheric sodium atoms for the Polychromatic Laser Guide Star Project" @default.
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- W2019866417 doi "https://doi.org/10.1016/j.cpc.2004.06.089" @default.
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