Programs in Physics & Physical Chemistry
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Programs in Physics & Physical Chemistry |
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| PROGRAM SUMMARY | ||
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| Manuscript Title: A program to compute the two-step excitation of mesospheric sodium atoms for the Polychromatic Laser Guide Star Project. | ||
| Authors: Véronique Bellanger, Arnaud Courcelle, Alain Petit | ||
| Program title: BEACON | ||
| Catalogue identifier: ADSX | ||
| Journal reference: Comput. Phys. Commun. 162(2004)143 | ||
| Programming language: FORTRAN 77. | ||
| Operating system: Windows, Linux. | ||
| RAM: 1 MWord | ||
| Word size: 32 bits | ||
| Keywords: Polychromatic Laser Guide Star, Mesospheric sodium atoms, Density-matrix formalism. | ||
| PACS: 32.10.Fn, 32.80.-t, 32.50.+d. | ||
| Classification: 2.5, 15. | ||
Nature of problem: Resolution of the Bloch equations in the case of two-step laser excitation of sodium atoms. | ||
Solution method: 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 are calculated using the branching ratios and the level lifetimes. | ||
Restrictions: 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. | ||
Running time: 12 hours. |
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