Two-beam noncollinear Makers fringe technique

Summary form only given. One of the most relevant quantities in understanding the poling process is the nonlinear depth (h) which is usually measured using the Makers fringe technique (MFT). We propose a two-noncollinear beam MFT that can measure nonlinear depths down to 2 /spl mu/m with sub-/spl mu/m resolution in glass and can be readily applied to second-order nonlinear films made of any other material. During the nonlinear interaction a second harmonic field is produced. We were able to determine the nonlinear depths as 4.8 /spl mu/m and 8 /spl mu/m respectively. It is worth noting that the classical one-beam MFT gives two identical curves for such nonlinear-depth values and that our results are m excellent agreement with those obtained elsewhere with chemical etching.