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Calculation of the Spatio-Temporal Dynamics of Q-switched Yb3+:YAG Laser with an Unstable Cavity and a Super-Gaussian Mirror |
CAO Ding-Xiang 1,2;ZHENG Wan-Guo1;Wang Xiao-Feng2;YU Hai-Wu1;HE
Shao-Bo1;Tan Ji-Chun2 |
| 1Research Center of Laser Fusion, China Academy of Engineering Physics, PO Box 919-988, Mianyang 6219002College of Optoelectric Science and Engineering, National University of Defence Technology, Changsha 410073 |
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| Cite this article: |
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CAO Ding-Xiang, ZHENG Wan-Guo, Wang Xiao-Feng et al 2007 Chin. Phys. Lett. 24 1273-1275 |
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Abstract A numerical simulation used to compute the spatio-temporal dynamics of pulse formation of diode-pumped Q-switched Yb:YAG laser is carried out. The model takes the laser amplification and gain saturation, the properties of the laser cavity, and the diffractive effects of the laser disc into account. The numerical calculation is performed for a confocal positive-branch unstable resonator with a super Gaussian coupling mirror. The simulation results show that the laser pulse starts from a Gaussian intensity distribution and becomes rapidly non-Gaussian. The corresponding beam quality M2 factor is seen to vary approximately from 1.5 at the beginning of the formation of pulse to more than 10 in the tail of the pulse, with a value of 11.6 at the peak of the pulse.
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| Keywords:
42.55.Xi
42.60.Da
42.60.Gd
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Received: 13 December 2006
Published: 23 April 2007
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| PACS: |
42.55.Xi
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(Diode-pumped lasers)
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42.60.Da
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(Resonators, cavities, amplifiers, arrays, and rings)
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42.60.Gd
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(Q-switching)
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[1] Silvestri S D, Magni V, Svelto O and G Valentini 1990 IEEE J.Quantum Electron. 26 1500
[2] Kamel A A 1997 Appl. Opt. 20 7809
[3] Ishaaya A A, Davidson N, Galina M, Erez H and Friesem A A 2003 IEEE J. Quantum Electron. 39 74
[4] Bourdet G L 2001 Opt. Commun. 200 331
[5] Urschel R, Borsutzky A and Wallenstein R 2000 Appl.Phys. B 70 203 |
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