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147 results on '"Tamošauskas, G."'

2. On the nature of spatiotemporal light bullets in bulk Kerr media

Author

Majus, D., Tamošauskas, G., Gražulevičiūtė, I., Garejev, N., Lotti, A., Couairon, A., Faccio, D., and Dubietis, A.

Subjects
Physics - Optics
Abstract

We present a detailed experimental investigation, which uncovers the nature of light bullets generated from self-focusing in a bulk dielectric medium with Kerr nonlinearity in the anomalous group velocity dispersion regime. By high dynamic range measurements of three-dimensional intensity profiles, we demonstrate that the light bullets consist of a sharply localized high-intensity core, which carries the self-compressed pulse and contains approximately 25% of the total energy, and a ring-shaped spatiotemporal periphery. Sub-diffractive propagation along with dispersive broadening of the light bullets in free space after they exit the nonlinear medium indicate a strong space-time coupling within the bullet. This finding is confirmed by measurements of spatiotemporal energy density flux that exhibits the same features as stationary, polychromatic Bessel beam, thus highlighting the physical nature of the light bullets.

Published
2014
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4. Filamentation and Pulse Self-compression in the Anomalous Dispersion Region of Glasses

Author

Couairon, A., Jukna, V., Darginavičius, J., Majus, D., Garejev, N., Gražulevičiūtė, I., Valiulis, G., Tamošauskas, G., Dubietis, A., Silva, F., Austin, D. R., Hemmer, M., Baudisch, M., Thai, A., Biegert, J., Faccio, D., Jarnac, A., Houard, A., Liu, Y., Mysyrowicz, A., Grabielle, S., Forget, N., Durécu, A., Durand, M., Lim, K., McKee, E., Baudelet, M., Richardson, M., Bandrauk, Andre D., editor, Lorin, Emmanuel, editor, and Moloney, Jerome V., editor

Published
2016
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15. LiSAF: AN EFFICIENT AND DURABLE NONLINEAR MATERIAL FOR SUPERCONTINUUM GENERATION IN THE ULTRAVIOLET.

Author

Šuminienė, A., Jukna, V., Šuminas, R., Tamošauskas, G., Vengris,, M., and Dubietis, A.

Subjects
SUPERCONTINUUM generation, IMPACT ionization, BUSINESS hours
Abstract

Copyright of Lithuanian Journal of Physics is the property of Lithuanian Academy of Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2020
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23. ULTRAFAST SUPERCONTINUUM GENERATION IN BULK CONDENSED MEDIA.

Author

Dubietis, A., Tamošauskas, G., Šuminas, R., Jukna, V., and Couairon, A.

Subjects
*NONLINEAR optics, *FEMTOSECOND lasers, *SUPERCONTINUUM generation, *SOLID-state lasers, *DIELECTRICS
Abstract

Nonlinear propagation of intense femtosecond laser pulses in bulk transparent media leads to a specific propagation regime, termed femtosecond filamentation, which in turn produces dramatic spectral broadening, or superbroadening, termed supercontinuum generation. Femtosecond supercontinuum generation in transparent solids represents a compact, efficient and alignment-insensitive technique for generation of coherent broadband radiation at various parts of the optical spectrum, which finds numerous applications in diverse fields of modern ultrafast science. During recent years, this research field has reached a high level of maturity, both in understanding of the underlying physics and in achievement of exciting practical results. In this paper we overview the state-of-the-art femtosecond supercontinuum generation in various transparent solid-state media, ranging from wide-bandgap dielectrics to semiconductor materials and in various parts of the optical spectrum, from the ultraviolet to the mid-infrared spectral range. A particular emphasis is given to the most recent experimental developments: multioctave supercontinuum generation with pumping in the mid-infrared spectral range, spectral control, power and energy scaling of broadband radiation and the development of simple, flexible and robust pulse compression techniques, which deliver few optical cycle pulses and which could be readily implemented in a variety of modern ultrafast laser systems. [ABSTRACT FROM AUTHOR]

Published
2017
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45. SUPERCONTINUUM GENERATION IN YAG AND SAPPHIRE WITH PICOSECOND LASER PULSES.

Author

Gražulevičiūtė, I., Skeivytė, M., Keblytė, E., Galinis, J., Tamošauskas, G., and Dubietis, A.

Subjects
SUPERCONTINUUM generation, YAG lasers, ULTRASHORT laser pulses, FRAUNHOFER region (Electromagnetism), NONLINEAR optics
Abstract

Copyright of Lithuanian Journal of Physics is the property of Lithuanian Academy of Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2015
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