Abstract
It is now well established that laser pulses, whose duration is not much larger than the transit time inside the cavity, undergo a beam-parameter evolution (concerning spot size, radius of curvature, far-field divergence, etc.) during the pulse life, from its beginning to its end. In practice, pulsed lasers, such as excimers and copper-vapor lasers, generate pulses making only a few transits inside the resonator. As a consequence, the steady state is seldom reached at the end of the pulse and the beam quality of the pulse is worse than that of a steady-state beam.
© 2000 IEEE
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