This paper was presented at the SPIE conference indicated above but inadvertently published by SPIE subsequent to its publication in another journal (Optics Letters). The paper has therefore been withdrawn from the SPIE Proceedings by the author and the publisher. The journal paper can be accessed at http://dx.doi.org/10.1364/OL.34.002730.
A novel scheme of the face-pumped double-slab Nd:YAG slab medium cooled by liquid with different temperatures on both sides is proposed. In this structure the thermal distortion of wavefront caused by the non-uniform temperature distribution in the laser gain media can be self-compensated. According to the running mode, the model of the slab medium’s temperature distribution and stress are presented. The analytic solutions for the model are derived. Furthermore, the numerical simulations with pulse pumping energy of 10J and repetition frequencies of 500Hz and 1000Hz are calculated for Nd:YAG laser medium. The simulation results show that the temperature gradient remains the approximative linearity, and the heat stress is in the range of stress extremes. Then the absorption coefficient is also discussed. The result indicates that the doped concentration cannot be too larger for the high repetition frequency laser. It has been prove that high repetition frequency, high average output power of the order of kW of Nd:YAG slab laser with high laser beam quality can be achieved in this structure.
A novel high average power double slab laser with hybrid resonator is presented. By analyzing and simulating thermal distribution of the face-pumped slab medium, it is found that the thermal distortion of wave front caused by the non-uniform temperature distribution of the laser gain media can be self-corrected in this structure. According to the analysis of the slab thermal distribution, a hybrid resonator is presented. Using a plane-wave or <b>k</b>-space expansion together with the fast Fourier transform, mode patterns, power outputs from the laser are calculated. Far-field characteristic and beam quality of these modes are discussed. And besides, by comparing the properties of off-axis hybrid resonator with the on-axis hybrid resonator's, the off-axis hybrid resonator can produce better quality beam.