Comparison of focusing of short pulses in the Debye approximation

Компьютерная оптика

Svetlana Khonina¹  Andrey Ustinov²  Sergey Volotovsky² 

[1] Image Processing Systems Institute of RAS – Branch of the FSRC "Crystallography and Photonics" RAS, Samara, Russia, Samara National Research University, Samara, Russia;Image Processing Systems Institute of RAS – Branch of the FSRC "Crystallography and Photonics" RAS, Samara, Russia;

关键词: short pulses;    frequency spectrum;    pulses focusing;    tight focusing;    aplanatic lens;    Debye approximation;   

DOI  :  10.18287/2412-6179-2018-42-3-432-446

来源: DOAJ

【 摘 要 】

We have examined different types of pulses and features of their frequency spectra. Calculations have shown that a significant distinction between the pulses only takes place at a very short pulse duration (shorter than the oscillation period). In this case, the Gaussian pulse becomes nonphysical and one needs to use other types of pulses, for example, the Poisson pulse. We performed comparative modeling of focusing of short pulses by an aplanatic lens for different polarization states and vortex singularity orders in the Debye approximation. We have shown that the polarization state and the presence of vortex phase singularity essentially affect the distribution in the focal area for a subcycle Poisson pulse.

【 授权许可】

Unknown