Optical losses characterization in channel waveguide through the photodeflection method M. Bertolotti, G. Liakhou, R. Li Voti, A. Matera, C. Sibilia et M. Valentino J. Phys. IV France, 04 C7 (1994) C7-647-C7-650 DOI: 10.1051/jp4:19947153