Figure 2
From: Laser-pointer-induced self-focusing effect in hybrid-aligned dye-doped liquid crystals
Optical setup for self-diffraction ring measurement.
(a) Schematic diagram of the optical setup. The beam diameter before L2 was 2 mm and the sample was placed at the focal point of L2 upon normal incidence where the beam size was 50 μm. M1, mirror; ND, neutral density filter; L1, plane convex lens; PH, pinhole; GP, Glan-Thompson prism (set to vertical polarization); L2, biconvex lens (f = 15 cm); BP, beam profile. (b) Illustration of the threshold light intensity determination using a beam profiler (left) by observation of the 3D and 1D images of the beam (right).
