Applied Physics B

, Volume 76, Issue 8, pp 833–838

Experimental investigation and numerical simulation of the spatio-temporal dynamics of nanosecond pulses in Q-switched Nd:YAG lasers

  • G. Anstett
  • M. Nittmann
  • A. Borsutzky
  • R. Wallenstein
Regular Paper

DOI: 10.1007/s00340-003-1189-4

Cite this article as:
Anstett, G., Nittmann, M., Borsutzky, A. et al. Appl. Phys. B (2003) 76: 833. doi:10.1007/s00340-003-1189-4

Abstract

This paper reports on an experimental investigation and numerical simulation of the spatio-temporal dynamics of the pulse formation in flashlamp-pumped Q-switched Nd:YAG lasers. The temporal evolution of the spatial intensity distribution is measured with a fast two-dimensional CCD camera. The measurements are performed for two lasers with different cavity configurations. A laser with an optically stable resonator and an internal mode aperture generated pulses with a spatial intensity distribution which is Gaussian at all times during the 10-ns-long pulse. During the pulse evolution the value of the beam-quality factor M2 remains below 1.3. In a laser with a positive-branch unstable resonator the laser pulse also starts with a Gaussian intensity distribution, but becomes rapidly non-Gaussian. The corresponding M2 values increase from about 1 at the beginning of the formation of the pulse to more than 12 in the tail of the pulse. The measurements are compared with the results of a numerical simulation which takes the laser amplification, the properties of the laser cavity, and the diffraction of the beam in the laser cavity into account. The spatio-temporal dynamics of the pulse formation predicted by the numerical model are in good agreement with the experimental results.

Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • G. Anstett
    • 1
  • M. Nittmann
    • 1
  • A. Borsutzky
    • 1
  • R. Wallenstein
    • 1
  1. 1.Fachbereich PhysikUniversität KaiserslauternKaiserslauternGermany