High-NA focusing of ultrashort laser pulses in bulk of ZnSe

Abstract

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.

Intrapulse Correlated Dynamics of Self-Phase Modulation and Spontaneous Raman Scattering in Synthetic Diamond Excited and Probed by Positively Chirped Ultrashort Laser Pulses

“…As a result, the application of dynamic methods for controlling parameters of ultrashort laser pulse interactions with dielectric media holds significant interest, encompassing measurements of nonlinear transmission [6], harmonic generation [7], supercontinuum generation [8] (self-phase modulation, SPM [3]), spontaneous [9], and stimulated Raman scattering [10], among others. Chirped ultrashort laser pulses, which exhibit temporal interaction dynamics with the material in the spectral representation [11,12], further pique interest for dynamic diagnostics.…”

Intrapulse Correlated Dynamics of Self-Phase Modulation and Spontaneous Raman Scattering in Synthetic Diamond Excited and Probed by Positively Chirped Ultrashort Laser Pulses

“…In this context, the application of diverse dynamic methods for the acquisition and control of parameters of ultrashort laser pulse interactions with dielectric media holds significant interest, encompassing measurements of intrapulse nonlinear transmission [9], harmonic generation [10], supercontinuum generation [11] (self-steepening and self-phase modulation, SPM [3]), spontaneous [12], and stimulated Raman scattering [13], among others. Chirped ultrashort laser pulses, which exhibit temporal interaction dynamics with the material in the spectral representation [14,15], further pique interest for dynamic diagnostics.…”