Investigation on temperature and thermal lens effects of laser diode pumped composite YAG rods
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Institute of Photonics & Photo Technology, Northwest University, Xi'an 710069, China;
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2.
Department of Physics, Shangluo Normal College, Shangzhou 726000, China
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Corresponding author:
BAI Jin-tao, baijt@rnvu.edu.cn
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Received Date:
2006-10-08
Accepted Date:
2006-11-13
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Abstract
Temperature field and thermal lens effect of laser diode end pumped composite Nd:YAG rod were investigated through numerical analysis methods.Numerical solutions of temperature field were obtained.The maximum temperature was 73.8℃ for composite laser crystal with an absorption coefficient of 3.5/cm,under pump power of 18W with 0.2mm beam radius.And also phase-retardation distribution ΔΦt(r)of the axial transmission light caused by radial temperature gradients was obtained.Comparing with conventional rod,the results show that composite rod leads a lower temperature rise in laser rod,as well as reduces distortion of pump end which brings on lens effect of laser crystal.Phase-retardation distribution ΔΦt(r) in composite rod is similar to that of conventional laser rod,but it doesn't accord with radius quadratic relationship,there is an aberration Δφ between the phase retardation of the thermal lens and referenced spherical lens.ΔΦt(r) corresponds with that of a spherical lens approximately at rp,and the equivalent foci fGRIN approaches to the same value of conventional rod,whereas Δφ increases quickly with the increase of laser beam radius at r>wp.
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