Thermal Effect Analytsis of Laser Rod by Diode
Laser Endª²Pumped
Li Long1£¬2£¬Shi Peng2£¬Chen Wen2£¬Gan Ansheng2£¬Hou
Xun1
£¨1£®School of Electronics and Information Engineering£¬Xi'an¡¡Jiaotong¡¡University£¬Xi'an
710049£¬China£»2£®Faculty of Science£¬Xi'an¡¡University of Architecture £¦
Technology£¬Xi'an 710055£¬China£©
Abstract£ºIn order to solve the thermal effect problem of laser rod by diode laser endª²pumped£¬
based on the heat conduct theory£¬ a novel eigenfunction group of heat conduction
equation was established and the general solutions of temperature field and thermal
distortion field within laser rod were obtained£® These analytical solutions not only
solve the problem of calculation error in temperature field brought by the approximate
assumption of radial heat flow in laser rod£¬ but also overcome the problem of low
precision caused by the numerical analysis method£® The results show that when the output
power of diode laser is 20 W£¬ and the Gaussian spot radius is 200 ¦Ìm£¬ 0.5£¥ £¨mass
fraction£© Ndª²ion doped yttrium vanadate laser rod can get a maximum temperature rise
of 451.2 ¡æ and a maximum thermal distortion of 3.42 ¦Ìm£® The distribution of heat flow
in laser rod is not radial through analyzing of the isotherm diagram£® Compared to the
calculation results with the assumption of radial heat flow in laser rod£¬ the maximum
temperature rise is reduced by 30£¥£® The results can be applied to the design of
resonant cavity and offer theoretical basis for reducing the thermal effect in laser
system£®
Keywords£ºdiode laser£» endª²pumped£» laser rod£» temperature field£» thermal
distortion field