Quantitative phase and refractive index analysis of optical fibers using differential interference contrast microscopy
Betty Kouskousis, Daniel J Kitcher, Stephen Collins, Ann Roberts, Greg W Baxter
APPLIED OPTICS | OPTICAL SOC AMER | Published : 2008
A systematic and straightforward image processing method to extract quantitative phase and refractive index data from weak phase objects is presented, obtained using differential interference contrast (DIC) microscopy. The method is demonstrated on DIC images of optical fibers where a directional integration routine is applied to the DIC images to extract phase and refractive index information using the data obtained across the whole DIC image. By applying the inverse Abel transform to the resultant phase images, an accurate refractive index profile is obtained. The method presented here is compared to the refracted near-field technique, typically used to obtain the refractive index profile ..View full abstract
The authors acknowledge the financial support of the Australian Research Council through the Discovery and International Linkage programs. We thank the Laboratoire de Physique de la Matiere Condensee for providing RNF analysis of the SMF28 single-mode fiber.