Features of Second Harmonic Generation of Intense Short Laser Pulses in Crystals with a Regular Domain Structure Under Conditions of Self-Action, Nonstationarity, and Synchronism of Group Velocities
| Autor: | U. K. Sapaev, O. V. Fedotova, Z. J. Ruziev, O. Kh. Khasanov |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Journal of Applied Spectroscopy. 88:514-518 |
| ISSN: | 1573-8647 0021-9037 |
| DOI: | 10.1007/s10812-021-01202-7 |
| Popis: | The process of frequency doubling of the first type of interaction (oo-e) of intense short laser pulses in crystals with a regular domain structure was numerically studied. The influences of the group-velocity dispersion of the medium to the third order and Kerr-type cubic nonlinearity on the formation of the second harmonic pulse were analyzed. The case where the conditions of quasi-phase matching and group-velocity synchronism were both simultaneously satisfied was considered. In this case, an insignificant change in the domain size from the exact value providing the quasi-phase matching condition was shown to lead to a significant increase in the efficiency (almost double) of second harmonic generation. Calculations showed that the latter was due to mutual compensation of phase shifts caused by Kerr-type cubic nonlinearity, the dispersion of the medium, and the additional value of the wavenumber of the nonlinear grating. Lithium niobate with 5% added MgO (5% MgO:LiNbO3) was chosen as a periodically polarized crystal in which the conditions of quasi-phase matching and group-velocity synchronism could be created at a certain wavelength of fundamental radiation (~1560 nm). |
| Databáze: | OpenAIRE |
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