Introduction to THz Wave Photonics

Abstract

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Prediction of an extremely large nonlinear refractive index for crystals at terahertz frequencies

“…Since their first demonstrations, terahertz techniques continue to find new applications from medical diagnostics and therapy to the detection of hidden substances, including explosives and drugs [1][2][3]. In recent years, pulsed sources of the terahertz radiation with sufficient intensity for the observation of nonlinear optical effects have appeared in a number of laboratories [4][5][6][7][8][9].…”

Index of Refraction and Absorption Coefficient Spectra of Paratellurite in the Terahertz Region

“…1). The software automatically completed the curve with zero values (zero padding) [15] to restore the original time window width of 62.5 ps resulting in a spectral resolution of 0.016 THz. After performing Fast Fourier Transform and taking into account the sample thickness, the software generates n(ν) and α(ν) as outputs.…”

Diffraction-Limited High-Power Single-Cycle Terahertz Pulse Generation in Prism-Cut LiNbO3for Precise Terahertz Applications

“…As a result, it turned out that there was a tradeoff between the pump-to-THz conversion efficiency and the spectral bandwidth for THz pulse generation. It is not a trivial task to achieve simultaneously high-energy and broadband THz pulses via optical rectification, because the frequency conversion for high-frequency ranges of >3 THz is strongly limited by the low intensity distribution at both spectrum ends of the excitation pulses and the phase matching condition [18]. Up until now, most of activities dealing with this technique were focused on generation of high pump-to-THz conversion efficiency with moderate spectral bandwidths.…”