Universität zu Köln

Hellemeier, Joschua A., Hickson, Paul and Labadie, Lucas ORCID: 0000-0001-5342-5713 (2017). Modeling the response of mesospheric sodium to pulsed-laser excitation. J. Opt. Soc. Am. A-Opt. Image Sci. Vis., 34 (8). S. 1376 - 1383. WASHINGTON: OPTICAL SOC AMER. ISSN 1520-8532

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Abstract

A simulation modeling excitation of the sodium D-2 line by nanosecond time scale pulsed lasers is described. By numerically integrating transition rates in the sodium hyperfine structure, the return flux per sodium atom is predicted as a function of laser power. The simulation should be useful for studies of mesospheric sodium and adaptive optics. Applications include the estimation of sodium column density from lidar return flux, and of laser guide star brightness for different pulsed laser formats. The simulation assumes that the pulse repetition frequency is sufficiently low (smaller than a few kilohertz) that atomic collisions restore local thermodynamic equilibrium between pulses. It is also assumed that the pulse length is short compared to the Larmor precession time scale. The numerical results are well-approximated by a simple analytic model for a three-level atom. The number of emitted photons is found to be primarily dependent on the product of the length of the laser pulse and the energy density. (C) 2017 Optical Society of America

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hellemeier, Joschua A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hickson, Paul UNSPECIFIED UNSPECIFIED UNSPECIFIED Labadie, Lucas UNSPECIFIED orcid.org/0000-0001-5342-5713 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-222618
DOI:	10.1364/JOSAA.34.001376
Journal or Publication Title:	J. Opt. Soc. Am. A-Opt. Image Sci. Vis.
Volume:	34
Number:	8
Page Range:	S. 1376 - 1383
Date:	2017
Publisher:	OPTICAL SOC AMER
Place of Publication:	WASHINGTON
ISSN:	1520-8532
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ADAPTIVE OPTICS; GUIDE STARS; LIDAR; TELESCOPE Multiple languages Optics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/22261