The absolute absorption spectra of low-loss optical waveguides, together with their intrinsic and extrinsic scatterings, were measured in the near infrared. Photothermal deflection spectroscopy was used to measure the full absorption spectra of a series of fluorinated cross-linked polymers. Assignment of —CH<sub>3</sub>, —CH<sub>2</sub>—, and —OH overtones as well as of combinations of overtones were made by use of the theory of anharmonic vibrations based on a Morse potential for local modes. Details of the molecular potential are given. The total attenuation in slab waveguides made with these polymers was measured by a prism-coupling technique and compared with the absolute absorption. Losses that are due to the material itself and those that are due to the processing are quantified.
© 2001 Optical Society of America
(060.4510) Fiber optics and optical communications : Optical communications
(160.5470) Materials : Polymers
(250.5460) Optoelectronics : Polymer waveguides
(290.0290) Scattering : Scattering
(300.1030) Spectroscopy : Absorption
Claire Pitois, Anders Hult, and Dorothea Wiesmann, "Absorption and scattering in low-loss polymer optical waveguides," J. Opt. Soc. Am. B 18, 908-912 (2001)