27 September 2010 to 1 October 2010
CSIR Convention Centre
Africa/Johannesburg timezone

On the sign of population lensing effect in Chromium-doped materials

Not scheduled
CSIR Convention Centre

CSIR Convention Centre

CSIR, Pretoria
Poster Track C - Lasers, Optics and Spectroscopy


Mr Thomas Godin (CIMAP)


We report measurements of polarisability changes Δα between the excited and ground states of the chromium active ions in a laser material by using two different methods (time-resolved divergence diagnostic, Z-scan techniques). The first one indicates that Δα <0 (converging population lensing), while the second one gives Δα >0 (diverging population lensing). This discrepancy has been resolved by introducing the concept of correlation collapse between the centre and the wings of a laser beam subject to intra-cavity clipping.

Primary authors


Prof. Kamel Ait-Ameur (CIMAP) Dr Michael Fromager (CIMAP) Prof. Richard Moncorgé (CIMAP) Prof. Tomaz Catunda (Universidade de Sao Paulo)

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