27 December 2001 Generation of narrowband THz radiation by surface-emitted optical rectification in periodically poled lithium niobate
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Abstract
We present theoretical and experimental results of THz-wave generation via optical rectification in periodically poled lithium niobate (PPLN) crystal. The rectified field in both frequency and time domain is calculated taking into account the divergence of the exciting optical beam. The dependence of the central frequency of the narrow-band THz-wave on of direction of field emission is investigated. The surface- emitting geometry (when the THz-wave is observed in direction perpendicular to the direction of the optical pulse propagation) reduces the damping of the THz-wave in the PPLN crystal considerably. In this geometry the measured central frequency is around 1 THz for our PPLN crystal with a poling period of (Lambda) equals 127 micrometers . The frequency is tuned by rotation of the crystal over a range of 0.65 - 1.1 THz. Typical bandwidths of 50 - 100 GHz were observed, depending on the collection angle and the number of periods involved.
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Yuri H. Avetisyan, Yuri H. Avetisyan, Carsten Weiss, Carsten Weiss, Garik Torosyan, Garik Torosyan, Rene Beigang, Rene Beigang, "Generation of narrowband THz radiation by surface-emitted optical rectification in periodically poled lithium niobate", Proc. SPIE 4490, Multifrequency Electronic/Photonic Devices and Systems for Dual-Use Applications, (27 December 2001); doi: 10.1117/12.455418; https://doi.org/10.1117/12.455418
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