Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

THE IMPACT OF GROUP VELOCITY DISPERSION ON FEMTOSECOND LASER FILAMENTATION WITH HIGHER-ORDER KERR EFFECT AT DIFFERENT ATMOSPHERIC PRESSURES
Yece Qian^a, Le Wang^b, Guoping Shi^a, Yufeng Zhang^a, Zuo Sun^a, and Yujuan Lin^c
^aSchool of Mechanical and Electrical Engineering, Chizhou University, 247000 Chizhou, China
^bSchool of Electrical and Electronic Engineering, Anhui Science and Technology University, 233100 Chuzhou, China
^cState Grid Anhui Electric Power Co., LTD., 230061 Hefei, Anhui Province, China
Email: wangle@ahstu.edu.cn

Received 23 March 2023; revised 15 April 2023; accepted 17 April 2023

The impact of group velocity dispersion (GVD) on femtosecond laser filamentation with the higher-order Kerr effect is studied at different atmospheric pressures. The results show that GVD makes the collapse distance to not meet the semi-empirical formula proposed by Dawes and Marburger, suppresses multiple focusing and splitting in time during the propagation process, and reduces the length of filament. In addition, we also compared the results with those considering only the third-order Kerr effect. This provides some information for the study of whether the defocus effect in the femtosecond laser filamentation is the higher-order Kerr effect or the plasma effect.
Keywords: femtosecond, filamentation, GVD, higher-order Kerr effect, pressure
PACS: 42.55.Ah, 42.65.-k

GRUPINIO GREIČIO DISPERSIJOS ĮTAKA FEMTOSEKUNDINIO LAZERIO SU AUKŠTESNIOSIOS EILĖS KERO EFEKTU FILAMENTACIJAI ĮVAIRAUS SLĖGIO ATMOSFEROJE
Yece Qian^a, Le Wang^b, Guoping Shi^a, Yufeng Zhang^a, Zuo Sun^a, Yujuan Lin^c

^aČidžou universitetas, Čidžou, Kinija
^bAnhujaus mokslo ir technologijų universitetas, Čudžou, Kinija
^cState Grid Anhui Electric Power Co., LTD., Hefėjus, Anhujaus provincija, Kinija

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