20 February 2007 Super-Gaussian pumping profiles for solid state lasers
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For a diode end-pumped solid state laser, the pump beam is described as a Gaussian profile initially and then as a flat-top profile. In fact, the fiber-coupled pump beam is more accurately fit by a super-Gaussian beam. With the same beam waist, different beam profiles can be obtained with different m. It is a Gaussian profile if m = 1; and it is a flat-top profile if m is infinite. The super-Gaussian beam should be normalized before it is used to characterize the thermal and optical properties of a solid state laser. With this normalized super-Gaussian pump beam, the corresponding analysis on thermal temperature, thermal radial and tangential stresses, refractive index changes, OPD, birefringence, depolarization loss, and rate equations are modeled more accurately. At the meantime, as the progress of diode laser technology, powerful and narrow line width diodes are becoming available. It is possible to directly pump nonlinear crystals such as KTP, LBO for second harmonic generation using diode laser. Nonlinear conversion efficiency is discussed. Thermal properties for a super-Gaussian beam (with different m) on nonlinear crystal are analyzed using finite element analysis.
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Xiaohua Liu, Yuejin Zhao, Allen Yang, Wenjie Xie, "Super-Gaussian pumping profiles for solid state lasers", Proc. SPIE 6451, Solid State Lasers XVI: Technology and Devices, 645120 (20 February 2007); doi: 10.1117/12.711928; https://doi.org/10.1117/12.711928


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