THERMAL SCIENCE

International Scientific Journal

THERMAL AND STRESS ANALYSIS IN ND: YAG LASER ROD WITH DIFFERENT DOUBLE END PUMPING METHODS

ABSTRACT
In this work, the finite element analysis has been used to predict the temperature distribution in Nd: YAG laser rod; double end-pumped by two methods Gaussian or top hat beam. The rod is cooled by water passing through annular, which surrounds the active media. The temperature distribution has been used to predict numerically, the nodal displacements, strain and stress based on the principle of virtual work. The main task is to determine the temperature distribution in Nd: YAG laser rod, the subsequent value and location of maximum tensile hoop stress associated with the two types of the double end pumping for different absorption power. Some conclusions are obtained; as the radius pumping ratio increases the location of maximum hoop stress will move toward the periphery and vice-versa. Small reduction is observed in the location of maximum hoop stress when pumping method change from the top-hat beam to Gaussian beam, especially at low radius pumping ratio and high absorption power. Top hat beam end pumping will cause more intense tension hoop stress at the facets of the rod than that of Gaussian beam even the later may produce high center temperature. This work may be important for designer while choosing the type of pumping, maximum produced tensile hoop stress and its location, especially when hoop stress is ultimate.
KEYWORDS
PAPER SUBMITTED: 2010-12-01
PAPER REVISED: 2010-12-13
PAPER ACCEPTED: 2011-01-23
DOI REFERENCE: https://doi.org/10.2298/TSCI101201004S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2011, VOLUME 15, ISSUE Supplement 2, PAGES [S399 - S407]
REFERENCES
  1. W. Koechner, Solid-State Laser Engineering, 6th edition, Springer Series .in Opt. Sci., USA,2006.
  2. C.Pfisther (et.al), Thermal beam distortions in End-pumped Nd:YAG,Nd:GSGG, and Nd:YLF Rods,IEEE Journal of Quantum Elelectronics, 30(1994),7,pp.1605-1614.
  3. Steve C.Tidwell (et.al), Scaling CW diode-end pumpued Nd:YAG laser to high Average powers, IEEE J.of Quantum Electronics ,28(1992),4,pp.997-1008.
  4. D.C. Brown, Nonlinear thermal and stress effects and scaling behavior of YAG slab amplifiers, IEEE Journal of Quantum Electronics,34(1998),12, pp. 2393-2402.
  5. J. Frauchiger, Peter Albers, and Heinz P. Weber, Modeling of Thermal Lensing and Higher Order Ring Mode Oscillation in End-Pumped CW Nd: Lasers, IEEE Journal of Quantum Electronics, 28(1992), 4,pp.1046-1056.
  6. Ananada K. Cousins, Temperature and Thermal Stress Scaling In Finite-Length End-Pumped Laser Rods, IEEE Journal of Quantum Electronics ,28(1992), 4,pp.1057-1069.
  7. R. W. Lewis, K. Morgan, H. R. Thomas, K. N. Seetharamu . The Finite Element Method In Heat Transfer Analysis , John Wiley & Sons Ltd., Chi Chester, U.K. 1996.
  8. S.S.Rao, the Finite Element Method in Engineering, fourth edition, Elsevier Science and technology books, 2004.
  9. M. Sunar, B.S. Yilbas K. Boran, Thermal and stress analysis of a sheet metal in welding, Journal of Materials Processing Technology, 72(2006), pp. 123-129.
  10. Ovais U. Khan, B.S. Yilbas,Laser heating of sheet metal and thermal stress development, Journal of Materials Processing Technology,155-156(2004),pp.2045-2050.
  11. J. Marion, Strengthened solid-state laser materials, Applied Physics Letters, 47(1985),7,pp .94-96.
  12. J. Marion, Fracture of solid-state laser slabs, Journal of Applied Physics, 60(1986),1,pp. 69-77.
  13. J. Marion, Appropriate use of the strength parameter in solid-state slab laser design, Journal of Applied Physics, 62(1987),.5, pp. 1595-1604.
  14. T.Y. Fan, J.L. Daneu, Thermal coefficients of the optical path length and refractive index in YAG, Applied Optics ,.37(1998) ,9 , pp 1635-1637.
  15. Zhigang Li (et.al), A study of axisymmetric thermal strain in a laser rod with longitudinal temperature rise, Applied Thermal Engineering,29(2009),14-15,pp.2927-2934.
  16. W.A. Clarkson, N.S. Felgate, D.C. Hanna: In OSA TOPS. Vol.19: Advanced Solid-State Lasers,ed. by W. Rosenberg, M.M. Feijer ,Opt. Soc. Am., Washington, pp. 401 ,1998.

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence