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

A. Keshavarz; G. Honarasa; T. Alamfard

doi:10.1117/12.882035

17 January 2011 Temperature distribution and thermal lensing in a flash lamp pumped Nd:YAG laser

A. Keshavarz, G. Honarasa, T. Alamfard

Proceedings Volume 7747, 16th International School on Quantum Electronics: Laser Physics and Applications; 77471A (2011) https://doi.org/10.1117/12.882035
Event: XVI International School on Quantum Electronics: Laser Physics and Applications, 2010, Nessebar, Bulgaria

Abstract

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.

Citation Download Citation

A. Keshavarz, G. Honarasa, and T. Alamfard "Temperature distribution and thermal lensing in a flash lamp pumped Nd:YAG laser", Proc. SPIE 7747, 16th International School on Quantum Electronics: Laser Physics and Applications, 77471A (17 January 2011); https://doi.org/10.1117/12.882035

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KEYWORDS

Rod lasers

Thermal effects

Crystals

Nd:YAG lasers

Lamps

Absorption

Refractive index

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