Two-photon absorption in THz electro-optical sampling crystals

Zhukova, Maria; Makarov, E. A.; Putilin, S. É.; Tsypkin, A. N.; Chegnov, V. P.; Chegnova, O. I.; Bespalov, V. G.

doi:10.1088/1742-6596/1062/1/012009

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…The main parameter of the terahertz radiation sources is optical-to-terahertz energy conversion efficiency. There are highly efficient methods of terahertz generation, for example, via optical rectification in crystals, which are limited by the destruction of the material with increase in the pump energy above the damage threshold [7][8][9]. It is worth noting the new variety of materials on the basis of which the efficient sources of terahertz radiation are being created [10,11].…”

Section: Introductionmentioning

confidence: 99%

Flat liquid jet as a highly efficient source of terahertz radiation

Tcypkin¹,

Ponomareva²,

Putilin³

et al. 2019

Opt. Express

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Polar liquids are strong absorbers of electromagnetic waves in the terahertz range, therefore, historically such liquids have not been considered as good candidates for terahertz sources. However, flowing liquid medium has explicit advantages, such as a higher damage threshold compared to solid-state sources and more efficient ionization process compared to gases. Here we report systematic study of efficient generation of terahertz radiation in flat liquid jets under sub-picosecond single-color optical excitation. We demonstrate how medium parameters such as molecular density, ionization energy and linear absorption contribute to the terahertz emission from the flat liquid jets. Our simulation and experimental measurements reveal that the terahertz energy has quasi-quadratic dependence on the optical excitation pulse energy. Moreover, the optimal pump pulse duration, which depends on the thickness of the jet is theoretically predicted and experimentally confirmed. The obtained optical-to-terahertz energy conversion efficiency is more than 0.05%. It is comparable to the commonly used optical rectification in most of electro-optical crystals and two-color air filamentation. These results, significantly advancing prior research, can be successfully applied to create a new alternative source of terahertz radiation.

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Section: Introductionmentioning

confidence: 99%

Flat liquid jet as a highly efficient source of terahertz radiation

Tcypkin¹,

Ponomareva²,

Putilin³

et al. 2019

Opt. Express

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Optical properties of Fe- and Nd-doped ZnSe crystals measured by pump-probe spectroscopy

Zhukova

Nabilkova

Putilin

et al. 2019

J. Phys.: Conf. Ser.

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We present the excited-state dynamics and optical properties of Fe- and Nd-diffusion doped zinc selenide polycrystals with different concentration measured by pump-probe spectroscopy in the visible and NIR range (400-1000 nm). The introduction of dopants allows one to control the optical properties of samples, which then can be used to create effective optoelectronic components for wide spectral ranges.

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Two-photon absorption in THz electro-optical sampling crystals

Cited by 2 publications

References 12 publications

Flat liquid jet as a highly efficient source of terahertz radiation

Flat liquid jet as a highly efficient source of terahertz radiation

Optical properties of Fe- and Nd-doped ZnSe crystals measured by pump-probe spectroscopy

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