Role of the aperture in <em> Z</em>-scan experiments: A parametric study

Role of the aperture in Z-scan experiments: A parametric study

Rashidian Vaziri M. R.

Two sets of NT curves corresponding to numerical evaluation of Eq. ( 8 ) and applying the analytical formula in Eq. ( 9 ) (symbols). Values of the nonlocal parameter m have been chosen so as to consider the three different possibilities: the local case ( m = 1), the wider ( m 1), and the narrower ( m 1) distributions of the nonlinear phase shift compared to the field intensity distribution. ^{[ 3 , 10 ]} The Δ Φ ₀ has been set to 0.1 to ensure the smallness of the nonlinear phase shift required by the Z -scan theory based on the GD analysis.^{[ 1 , 3 ]}