Abstract

A new, to our knowledge, method for measuring the refractive index of liquids in the near infrared by means of waveguide Čerenkov second-harmonic generation is presented. It makes use of a nonlinear planar waveguide whereby the liquid sample is put into place as the cover. By measurement of the output angle of the Čerenkov radiation mode (in the visible) the liquid sample refractive index (in the near infrared) is determined. Experiments were performed by means of a proton-exchanged LiNbO₃ waveguide as the sensor and a set of liquids with known refractive index. The values obtained are in good agreement with the expected ones, and the average accuracy is on the third decimal place.

© 1998 Optical Society of America

Reflective-type configuration for nearly phase-matching ?erenkov second-harmonic generation in a nonlinear-optical polymer waveguide

Feng Wang, Zhuangqi Cao, and Qishun Shen
Opt. Lett. 30(5) 522-524 (2005)

Liquid refractometry by the rainbow method

Hiroyuki Hattori, Hidenori Kakui, Hendrik Kurniawan, and Kiichiro Kagawa
Appl. Opt. 37(19) 4123-4129 (1998)

Spectral measurement of the film–substrate index difference in proton-exchanged LiNbO₃ waveguides

Kacem El Hadi, Vipul Rastogi, Mangalpady R. Shenoy, Krishna Thyagarajan, Marc De Micheli, and Daniel B. Ostrowsky
Appl. Opt. 37(27) 6463-6467 (1998)

Unified approach to Čerenkov second harmonic generation

Vito Roppo, Ksawery Kalinowski, Yan Sheng, Wieslaw Krolikowski, Crina Cojocaru, and Jose Trull
Opt. Express 21(22) 25715-25726 (2013)

Parabolic mirror optics for collimation of a crescent blue laser beam radiated from channel waveguide Čerenkov second-harmonic generation

Ming Wang, Osami Wada, and Ryuji Koga
Appl. Opt. 35(19) 3459-3465 (1996)