Projection objective for focusing laser radiation

Потапова Н.И., Цветков А.Д. Проекционный объектив для фокусировки лазерного излучения // Оптический журнал. 2010. Т. 77. № 3. С. 73–78.

Potapova N.I., Tsvetkov A.D. Projection objective for focusing laser radiation [in Russian] // Opticheskii Zhurnal. 2010. V. 77. № 3. P. 73–78.

N. I. Potapova and A. D. Tsvetkov, "Projection objective for focusing laser radiation," Journal of Optical Technology. 77(3), 212-215 (2010). https://doi.org/10.1364/JOT.77.000212

Objectives with numerical apertures of 0.1-0.4 have been developed and fabricated for focusing laser radiation. A feature of the objectives is that they use an aspheric surface of the same form regardless of the numerical aperture, while the objectives are capable of obtaining a diffraction-limited focusing spot at various wavelengths.