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The nonlinearity of the refractive index of optical media in the terahertz spectral range

Tcypkin A.N., Putilin S.E., Kulya M.S., Drozdov A.A., Siddiqui M., Choudhary S., Zhao J., Bespalov V.G., Boyd R.W., Zhang X.C., Kozlov S.A.
Тип документа: Journal Article
Дата публикации: 2017-08-04
Название журнала: EPJ Web of Conferences
Издатель: EDP Sciences
Квартиль: Q4
ISSN: 21016275, 2100014X
DOI:  10.1051/epjconf/201714905005
  • General Medicine
Краткое описание
Recently, great progress has been made in the generation of high-intensity terahertz (THz) radiation, which has led to the opportunity to explore non-linear processes in the THz frequency range [1]. A key parameter characterizing the nonlinear response of a material is the non-linear refractive index, denoted as n2. It has been predicted theoretically [2] that the THz nonlinear response of crystals is extremely large as a consequence of a strong vibrational contribution. An indirect assessment of n2 for lithium niobate at THz frequencies was reported in [3], leading to a value of approximately 10cm/W. We find that n2 = 4.0 × 10сm/W, which is approximately 3 orders of magnitude larger that the value 2.4×10 cm/W in the NIR spectral range [4]. The present paper is devoted to theoretical analysis and a direct experimental measurement of n2 for crystalline ZnSe in the THz spectral range. In this paper, we also consider the special aspects of self-action of single-cycle waves in media with given nonlinearities. It is shown that self-focusing efficiency in transparent dispersive medium decreases when the number of oscillations in input radiation is decreased for few-cycle paraxial waves with the same maximum electric field and transverse size, i.e., with the same ratio of the radiation power to the critical self-focusing power.
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1. Tcypkin A.N. и др. The nonlinearity of the refractive index of optical media in the terahertz spectral range // EPJ Web of Conferences. 2017. Т. 149. С. 05005.
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TY - JOUR

DO - 10.1051/epjconf/201714905005

UR - http://dx.doi.org/10.1051/epjconf/201714905005

TI - The nonlinearity of the refractive index of optical media in the terahertz spectral range

T2 - EPJ Web of Conferences

AU - Tcypkin, A.N.

AU - Putilin, S.E.

AU - Kulya, M.S.

AU - Drozdov, A.A.

AU - Siddiqui, M.

AU - Choudhary, S.

AU - Zhao, J.

AU - Bespalov, V.G.

AU - Boyd, R.W.

AU - Zhang, X.C.

AU - Kozlov, S.A.

PY - 2017

PB - EDP Sciences

SP - 05005

VL - 149

SN - 2100-014X

ER -

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@article{Tcypkin_2017,

doi = {10.1051/epjconf/201714905005},

url = {https://doi.org/10.1051%2Fepjconf%2F201714905005},

year = 2017,

publisher = {{EDP} Sciences},

volume = {149},

pages = {05005},

author = {A.N. Tcypkin and S.E. Putilin and M.S. Kulya and A.A. Drozdov and M. Siddiqui and S. Choudhary and J. Zhao and V.G. Bespalov and R.W. Boyd and X.C. Zhang and S.A. Kozlov},

editor = {A.G. Litvak},

title = {The nonlinearity of the refractive index of optical media in the terahertz spectral range},

journal = {{EPJ} Web of Conferences}

}

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Tcypkin, A.N. et al. “The Nonlinearity of the Refractive Index of Optical Media in the Terahertz Spectral Range.” Ed. A.G. Litvak. EPJ Web of Conferences 149 (2017): 05005. Crossref. Web.