Vol. 28, issue 11, article # 4

Abstract:

Results of experimental investigation of spatial characteristics of the region of multiple filamentstion of giga- and terawatt pulses of Ti:Sapphire laser in the glass and water are presented. The pulse power dependences of the coordinates of the filamentation region, the number of filaments, their distribution along the axis of the laser beam, and the mean length of the filaments on the impulse power are presented. It is shown that the spatial characteristics of filamentation region are qualitatively similar for water and glass. It is found that the number of filaments along the region of multiple filamentation has a unimodal distribution. When increasing the radiation power, the length of individual filaments in the field of multiple filamentation is reduced, and the diameter has a quasi-constant value at all values of power, implemented in the experiments. The filamentation region, when reaching a certain power laser pulses with a Gaussian distribution of energy density, takes the form of a hollow cone with the apex directed to the source of radiation.
 

Keywords:

laser radiation, femtosecond pulse, self-focusing, multiple filamentation, glass, water

References:

1. Marburger J.H. Self-focusing: Theory // Progr. Quant. Electron. 1975. V. 4, part 1. P. 35–110.
2. Gejnc Ju.Je., Zemljanov A.A. Harakteristiki filamentov pri rasprostranenii moshhnogo femtosekundnogo lazernogo izluchenija v vozduhe i v vode: I. Kachestvennyj analiz // Optika atmosf. i okeana. 2010. V. 23, N 9. P. 749–756.
3. Gejnc Ju.Je., Zemljanov A.A. Harakteristiki filamentov pri rasprostranenii moshhnogo femtosekundnogo lazernogo izluchenija v vozduhe i v vode: II. Chislennoe modelirovanie // Optika atmosf. i okeana. 2010. V. 23, N 9. P. 757–760.
4. Martynovich E.F., Kuznecov A.V., Kirpichnikov A.V., Pestrjakov E.V., Bagaev S.N. Sozdanie ljuminescentnyh jemitterov intensivnym lazernym izlucheniem v prozrachnyh sredah // Quant. Electron. 2013. V. 43, N 5. P. 463–466.
5. Dergachev A.A., Kadan V.N., Shljonov S.A. Vzaimodejstvie nekollinearnyh femtosekundnyh lazernyh filamentov v sapfire // Quant. Electron. 2012. V. 42, N 2. P. 125–129.
6. Kul'chin Ju.N., Vitrik O.B., Chehlenok A.A., Zhizhchenko A.Ju., Proshhenko D.Ju., Mirochnik A.G., Lju Zhuohu. Fotoregistracija mnozhestvennoj filamentacii femtosekundnogo lazernogo izluchenija v polimetilmetakrilate, dopirovannom 2,2-diftoro-4-(9-antracil)-6-metil-1,3,2-dioksaborinom // Quant. Electron. 2013. V. 43, N 12. P. 1118–1121.
7. Alfano R.R., Shapiro S.L. Observation of self-phase modulation and small-scale filaments in crystals and glasses // Phys. Rev. Lett. 1970. V. 24, N 11. P. 592.
8. Schroeder H., Liu J., Chin S.L. From random to controlled small-scale filamentation in water // Opt. Express. 2004. V. 12, N 20. P. 4768–4774.
9. Liu J., Schroeder H., Chin S.L., Li R., Yu W., Xu Z. Space-frequency coupling, conical waves and small-scale filamentation in water // Phys. Rev. A. 2005. V. 72, N 5. P. 053817.
10. Liu J., Schroeder H., Chin S.L., Li R., Yu W., Xu Z. Control and organization of multi-filamentation of femtosecond laser pulses in optical media // J. Korean Phys. Soc. 2007. V. 51, N 4. P. 1572–1577.
11. Brodeur A., Chien C.Y., Ilkov F.A., Chin S.L., Kosareva O.G., Kandidov V.P. Moving focus in the propagation of ultrashort laser pulses in air // Opt. Lett. 1997. V. 22, N 5. P. 304.
12. Apeksimov D.V., Bukin O.A., Bykova E.E., Golik S.S., Zemljanov A.A., Kabanov A.M., Kuchinskaja O.I., Major A.V., Matvienko G.G., Oshlakov V.K., Petrov A.V., Sokolova E.B. Mnozhestvennaja filamentacija kollimirovannyh puchkov Ti:Sapphire-lazera v vode // Optika atmosf. i okeana. 2014. V. 27, N 11. P. 957–960.
13. Apeksimov D.V., Zemljanov A.A., Iglakova A.N., Kabanov A.M., Kuchinskaja O.I., Matvienko G.G., Oshlakov V.K., Petrov A.V. Filamentacija teravattnyh lazernyh impul'sov na stometrovoj atmosfernoj trasse // Optika atmosf. i okeana. 2015. V. 28, N 3. P. 274–277.