High-NA focusing of ultrashort laser pulses in bulk of ZnSe
Gulina Y.S. 1,2, Kudryashov S. I.2, Smirnov N.A.2, Kuzmin E. V.2
1Bauman Moscow State Technical University, Moscow, Russia
2Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
Email: julia-sg@yandex.ru

PDF
A study of high-NA focusing process of ultrashort laser pulses in bulk of ZnSe has been carried out. It is shown that when focusing laser Gaussian beam with high-aperture lenses into a transparent medium aberration distortions occur leading to an increase in focal spot size. The results of experimental studies on ablation of front and back surfaces of a plane-parallel plate with 4 mm thickness made of ZnSe by laser pulses with a duration of 0.3 ps, 1 ps, 10 ps and a wavelength of 1030 nm focused by a micro lens (NA=0.55) are presented. It is shown that at low pulse energies focusing can be considered in a linear mode in which focal spot size is due to aberration distortions. Keywords: direct laser writing, femtosecond laser pulses, high-NA focusing, ablation, aberrations.
Publisher:

Ioffe Institute

Institute Officers:

Director: Sergei V. Ivanov

Contact us:

26 Polytekhnicheskaya, Saint Petersburg 194021, Russian Federation
Fax: +7 (812) 297 1017
Phone: +7 (812) 297 2245
E-mail: post@mail.ioffe.ru