Thermal lensing effects in pulsed end pumped Nd lasers at 940 nm

Sha Wang; Xin Wang; T. Riesbeck; H.-J. Eichler

doi:10.1117/12.822688

19 February 2009 Thermal lensing effects in pulsed end pumped Nd lasers at 940 nm

Sha Wang, Xin Wang, T. Riesbeck, H.-J. Eichler

Proceedings Volume 7194, Laser Resonators and Beam Control XI; 71940J (2009) https://doi.org/10.1117/12.822688
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

Abstract

Wavelength around 940 nm lasing can be obtained by quasi-three-level operation of Nd doped laser crystal. Diode end pumping provides the necessary high pump intensity in the laser crystal. In order to get high efficiency of the end pumped laser system, the overlap coefficient between pump beam and laser beam should be optimized. Thermal lens coefficient is one of the most important parameters to design the laser cavity structure. The time dependent heat conduction equation is solved numerically in order to study the thermal lens effect in pulsed pumping laser crystal. Calculated results showed that the thermal lens coefficients change with different pump frequencies. Experiments are done with Nd:YAG and Nd:GSAG laser rod. The thermal lens coefficient of Nd:YAG at pump frequency 50 Hz with pump beam diameter 1.5 mm is 10.2 Wm, while the thermal lens coefficient of Nd:GSAG at pump frequency 50 Hz with pump beam diameter 1.75 mm is 5.9 Wm.

Citation Download Citation

Sha Wang, Xin Wang, T. Riesbeck, and H.-J. Eichler "Thermal lensing effects in pulsed end pumped Nd lasers at 940 nm", Proc. SPIE 7194, Laser Resonators and Beam Control XI, 71940J (19 February 2009); https://doi.org/10.1117/12.822688

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