DocumentCode
1136349
Title
Short time-constant thermal self-defocusing of laser beams
Author
Dabby, Franklin W. ; Boyko, R.W. ; Shank, Charles V. ; Whinnery, J.R.
Author_Institution
Dept. of Elec. Engrg. and Computer Sciences and the Elctronics Research Lab., Univ. of California, Berkeley, CA, USA
Volume
5
Issue
10
fYear
1969
fDate
10/1/1969 12:00:00 AM
Firstpage
516
Lastpage
520
Abstract
Time constants as low as 20 μs have been observed when the beam of a helium-neon laser is focused on a small spot on a thin dye sample and the thermal self-defocusing effects observed. The short time constant arises mainly from the small spot size, but to some extent from axial heat flow to the cell ends. The analysis takes into account the axial heat flow, the variation of spot size within the cell, and diffraction defocusing. Agreement between analysis and experiment is good except for cases of the smallest spot sizes, in which case convective turbulence was observed.
Keywords
Delay; Diffraction; Heat engines; Laser beams; Lenses; Photodiodes; Resistance heating; Thermal engineering; Thermal lensing; Wheels;
fLanguage
English
Journal_Title
Quantum Electronics, IEEE Journal of
Publisher
ieee
ISSN
0018-9197
Type
jour
DOI
10.1109/JQE.1969.1075685
Filename
1075685
Link To Document