Abstract
Spectrum broadening in the post-filament channel of femtosecond laser pulses with an initial wavelength of 944, 744, and 472 nm is experimentally studied. This effect is numerically simulated; spectral red shift mechanisms are discussed by the example of a comparative analysis of experimental and calculated data. It is intended to use the effect under consideration to form two-frequency pulses and their subsequent transformation to the mid-IR by intrapulse difference frequency generation. An analysis shows that 744 nm is the most promising wavelength for this problem among wavelengths under consideration.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
REFERENCES
Méchain, G., Couairon, A., André, Y.-B., D’Amico, C., Franco, M., Prade, B., Tzortzakis, S., Mysyrowicz, A., and Sauerbrey, R., Long-range self-channeling of infrared laser pulses in air: a new propagation regime without ionization, Appl. Phys. B, 2004, vol. 79, no. 3, pp. 379–382. https://doi.org/10.1007/s00340-004-1557-8
Geints, Y.E., Zemlyanov, A.A., Ionin, A.A., Mokrousova, D.Y., Seleznev, L.V., Sinitsyn, D.V., and Sunchugasheva, E.S., Post-filamentation propagation of high-power laser pulses in air in the regime of narrowly focused light channels, Quantum Electron., 2016, vol. 46, no. 11, pp. 1009–1014. https://doi.org/10.1070/QEL16154
Kosareva, O., Panov, N., Shipilo, D., Mokrousova, D., Nikolaeva, I., Mitina, E., Koribut, A., Reutov, A., Rizaev, G., Couairon, A., Houard, A., Skryabin, D., Saletskiy, A., Savel’ev, A., Seleznev, L., Ionin, A., and Chin, S.L., Postfilament supercontinuum on 100 m path in air, Opt. Lett., 2021, vol. 46, no. 5, pp. 1125–1128. https://doi.org/10.1364/OL.416224
Grudtsyn, Ya.V., Kinyaevskiy, I.O., Koribut, A.V., Seleznev, L.V., Gerasimova, Yu.A., Rogashevskii, A.A., and Ionin, A.A., Broadband (8.5–13.5 μm) intra-pulse difference frequency generation in a LiGaS2 crystal of 90 fs 744 nm laser pulse after its continuous redshift in air, Opt. Lett., 2021, vol. 46, no. 14, pp. 3420–3423. https://doi.org/10.1364/OL.426943
Ishii, N., Kaneshima, K., Kitano, K., Kanai, T., Watanabe, S., and Itatani, J., Carrier-envelope phase-dependent high harmonic generation in the water window using few-cycle infrared pulses, Nat. Commun., 2014, vol. 5, no. 3, pp. 1–6. https://doi.org/10.1038/ncomms4331
Terahertz and Mid-Infrared Radiation: Detection of Explosives and CBRN (Using Terahertz), Pereira, M.F. and Shulika, O., Eds., Dordrecht: Springer, 2014.
Bukin, O.A., Bykova, E.E., Geints, Yu.E., Golik, S.S., Zemlyanov, A.A., Ilin, A.A., Kabanov, A.M., Matvienko, G.G., Oshlakov, V.K., and Sokolova, E.B., Filamentation of tightly focused ultrashort laser pulse of 800 and 400 nm wavelength: Measurements of nonlinear index of air refraction, Atmos. Oceanic Opt., 2011, vol. 24, no. 5, pp. 417–424.
Nonlinear Optical Crystals: A Complete Survey, Nikogosyan, D.N., Ed., Springer, 2006.
Volkov, A.G. and Trofimov, V.A., Conservative finite-difference scheme for the problem of a femtosecond laser pulse with an axially symmetric profile propagating in a medium with cubic nonlinearity, Comp. Math. Math. Phys., 2007, vol. 47, no. 10, pp. 1681–1701. https://doi.org/10.1134/S0965542507100090
Funding
This study was supported by the Russian Science Foundation, project no. 19-11-00113.
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
The authors declare that they have no conflicts of interest.
Additional information
Translated by A. Kazantsev
About this article
Cite this article
Grudtsyn, Y.V., Kinyaevskiy, I.O., Koribut, A.V. et al. Spectrum Broadening of Femtosecond Pulses of a Titanium–Sapphire Laser in the Post-Filament Channel with Varying Radiation Wavelength. Bull. Lebedev Phys. Inst. 49, 25–29 (2022). https://doi.org/10.3103/S1068335622010043
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.3103/S1068335622010043