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Study on Thermal Effects of the Crystal in Diode Solid-state Lasers

Author: GuoLongCheng
Tutor: GuoZhen
School: Xi'an University of Electronic Science and Technology
Course: Optical Engineering
Keywords: Diode-pumped solid-state lasers Thermal effects Thermal lens focal length Numerical Simulation Dispersion effect
CLC: TN248.1
Type: Master's thesis
Year: 2010
Downloads: 168
Quote: 3
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Abstract


Thermal effects is an important factor affecting the performance of solid-state lasers, diode-pumped solid-state lasers for the study, the focus of theoretical research and numerical simulation of the laser crystal laser thermal lens effect, and discuss the dispersion of the thermal lens effect. The innovation lies in the analytical calculation of the distribution of temperature field and temperature gradient induced thermal lens focal length laser crystal Gaussian pump source to a fourth order approximation. Firstly, based on a four-level laser rate equations, Gaussian beam of the fundamental mode Gaussian oscillating light performance, calculate the overlap integral of the pump light and low-order mode Gaussian oscillating light and pump light the degree of pattern matching and oscillation bare field space laser output characteristics. Second, the focus of research due to the thermal lens effect of the laser crystal caused by the temperature gradient, the step is a discussion of the intensity distribution of the Gaussian beam light and super-Gaussian beam pump source; Assuming crystal side to maintain a constant temperature, discussion different pump source, the three-dimensional temperature field distribution of the laser crystal. Analytic derivation of the Gaussian beam pump source, the three-dimensional temperature field of the laser crystal four first-order approximation expressions, numerical simulation of super-Gaussian pump source under the three-dimensional temperature field distribution of the laser crystal; theoretical Gaussian pump source , the thermal lens focal length of the laser crystal. To visualize clearly demonstrated the crystal thermal lens effect, the use of finite element software and mathematical analysis tools simulated Gaussian pump source, the thermal effect of the laser crystal light waves generated by the phase difference, and to study the thermal lens focal length along the crystal radial Variation. The studies show that the thermal lens in the usual case of non-ideal optical lens, a planar lightwave through the crystal will become non-spherical waves, emitted form the diffuse plaque. In this paper, a judgment thermal lens this dispersion effect size of mathematical parameters M, is defined as the ratio of the minimum radius of diffuse plaque diffraction-limited spot radius. Geometrical optics method to study the variation of the M parameter with the pump power and the pump light radius. The study found that the distance to the exit end face of the smallest spot to crystal decreases with increasing pump power, and increases with the increase of the radius of the pumping light. Minimum spot radius with the radius of the pump light only, independent of the pump power. M parameter increases with increasing pump power, decreases with the increase of the radius of the pumping light. Conclusion, the greater the power of the pump light, the smaller the radius of the pump light, the worse the beam quality; Conversely, the smaller the pump power, the greater the radius of the pump light, the beam quality is better.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser > Solid-state lasers
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