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Modeling of thermal lensing in side and end-pumped finite solid-state laser rodsAn analytical expression for approximating the time-dependent thermal focal length in finite solid state laser rods was derived. The analysis is based on the temperature variation of the material refractive index caused by optical pumping of these rods. Several quantities were found to be relevant to this analysis. These quantities were the specific thermal profiles of the rods, type of optical pumping employed, type of cooling scheme employed (side and end-cooling parameters), and the specific material characteristics of the rods. The Thermal Lensing Model was formulated using the geometric ray tracing approach. The focal lengths are then approximated, by calculating the phase shift in the index of refraction, as the different rays of an incident plane wave are tracked through a lens-like crystal medium. The approach also applies in the case of Gaussian or parabolic pump beams. It is shown that the prediction of thermal focal length is in good quantitative agreement with experimentally obtained data.
Document ID
19900014400
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Brackett, Vincent G. (Hampton Univ. VA, United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1990
Subject Category
Lasers And Masers
Report/Patent Number
NAS 1.26:4300
NASA-CR-4300
Accession Number
90N23716
Funding Number(s)
PROJECT: RTOP 590-31-31
CONTRACT_GRANT: NAG1-666
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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