Abstract

Thermal lensing colorimetry has been applied to the determination of nitrite ion. Color development was based on the diazo-coupling reaction among NO₂⁻, N-(naphthyl)-ethylenediamine dihydrochloride, and sulfanylamide. The source was the chopped output of an Ar⁺ laser operated at 514.5 nm. The beam intensity was measured with a silicon photocell of 1 mm² surface area and the resultant electrical signal was processed with a microcomputer system. The minimal detectable amount of nitrite ion using a cell of 1 cm path length is 0.2 n<i>M</i>. This is more than 200 times smaller than the detection limit of ordinary spectrophotometry using a commercial spectrophotometer.

Highly sensitive and selective detection of nitrite using a fiber optofluidic laser

Dongyang Li, Qingbo Xu, Fang Zhao, Chengde Guo, Jianwei Li, Xiaoyun Pu, Jing Xia, Yanfei Lü, and Yuanxian Zhang
Opt. Express 31(20) 31982-31992 (2023)

Single-beam interface thermal lensing

Marcos Gugliotti, Mauricio S. Baptista, Luís G. Dias, and Mario J. Politi
Appl. Opt. 38(7) 1213-1215 (1999)

Thermal lensing in an end-pumped Yb:KGW slab laser with high power single emitter diodes

F. Hoos, S. Li, T. P. Meyrath, B. Braun, and H. Giessen
Opt. Express 16(9) 6041-6049 (2008)

Thermal Lensing in a Nd:YAG Laser Rod

W. Koechner
Appl. Opt. 9(11) 2548-2553 (1970)

Simulation and compensation of thermal lensing in optical systems

Phillip Lino Rall, Daniel Förster, Thomas Graf, and Christoph Pflaum
Opt. Express 30(21) 38643-38662 (2022)