Interferometric method of measuring the angular divergence of laser beams

Тихонов Е.А., Киселев О.В. Интерферометрический метод измерения угловой расходимости лазерных пучков // Оптический журнал. 2007. Т. 74. № 4. С. 42–46.

Tikhonov E.A., Kiselev O.V. Interferometric method of measuring the angular divergence of laser beams [in Russian] // Opticheskii Zhurnal. 2007. V. 74. № 4. P. 42–46.

E. A. Tikhonov and O. V. Kiselev, "Interferometric method of measuring the angular divergence of laser beams," Journal of Optical Technology. 74 (4), 258-262 (2007). https://doi.org/10.1364/JOT.74.000258

This paper proposes an interferometric method of measuring the angular divergence of laser radiation. The method is based on measuring the angular period and counting the number of observed interference orders in reflected light (from a plane-parallel Fabry-Perot etalon). A procedure that uses a precision goniometer (no worse than 1 arc min) is proposed for measuring the angular period of the interference structure. An advantage of the method is that it is simple and highly accurate by comparison with amplitude methods of measurement. A quantitative analysis and the results of certification of the method are presented.