Spatial ringing and central dark zone formation in absorptive nonlinear beam propagation.
We have observed the theoretically predicted central dark zone formation in a continuous-wave propagation experiment that is not due to thermal changes in the index of refraction. The effect has been observed in a pink ruby rod with argon-ion and dye lasers. The results confirm the requirements of an optically thick and highly saturated medium for experimental observation of the effect.
Afzal
R S
RS
Lawandy
N M
NM