https://www.selleckchem.com/pr....oducts/dt-061-smap.h
We introduce an effective method for measuring the refractive indices of a uniaxial crystal based on the independent self-focusing property of non-uniformly correlated beams along the $x$ and $y$ directions. We demonstrate how the positions of the independent foci can be changed by adjusting coherence lengths to determine the characteristic coherence lengths of the beams in a uniaxial crystal, and how this information can be used to determine the refractive indices by relating the propagation characteristics of the beam in free spac