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Temperature distribution and thermal lensing in a flash lamp pumped Nd:YAG laser

The effect of thermal lensing is a critical factor for resonator design and must be considered to improve the beam quality. The absorption of the pump radiation by laser material and surface cooling leads to a nonuniform temperature distribution in the rod. In this letter the temperature distribution in a cylindrical Nd:YAG rod under repetitive flash lamp pulses is numerically simulated, when pumped by flash lamp with 150 μs pulse width and 10 Hz repetition rate . We consider Gaussian pump pulse shape in time and redial absorption in laser rod. Our calculations show that the temperature converges to a finite value and doses evolve in time noticeably. Also by computing the changes of refraction index, we obtain the focal length of the heat dispersion.