Abstract
Intense Terahertz (THz)-wave generation and highly sensitive THz-wave detection were obtained by wavelength conversion with nonlinear optical susceptibility χ(2) of LiNbO3 crystals. Maximum peak output of about 50 kW (5 μJ/pulse) was demonstrated in an injection-seeded THz-wave parametric generator pumped by post-amplified emission from a microchip Nd:YAG laser. Using the sub-nanosecond pulse duration of the laser proposed herein provides effective mitigation of stimulated Brillouin scattering in LiNbO3, producing higher gain for wavelength conversion between near-infrared (near-IR) pump light and THz waves. Monochromatic THz radiation was obtained in the continuous tuning range of 0.7–2.9 THz. Additionally, highly sensitive THz-wave detection was demonstrated based on up-conversion from THz waves to near-IR light as well as efficient THz-wave generation. The signal generated with non-collinear phase-matching condition showed spectroscopic detection on the screen apart from the LiNbO3 crystal. Highly sensitive detection with minimum energy of about 80 aJ/pulse (0.8 μW at peak) and a large dynamic range of more than 100 dB were achieved in this experiment.
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Acknowledgments
The authors wish to thank Prof. H. Ito and Prof. M. Kumano of Tohoku University for extremely helpful discussions and advice. This work was partially supported by the Strategic International Cooperative Program (Japan–Singapore and Japan–France), and Collaborative Research Based on Industrial Demand of the Japan Science and Technology Agency (JST), and as a JSPS Sakura-project (I2012651), KAKENHI (23360045), (23560053), (24560535), (25286075), (25400436), and (25220606).
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Minamide, H., Hayashi, S., Nawata, K. et al. Kilowatt-peak Terahertz-wave Generation and Sub-femtojoule Terahertz-wave Pulse Detection Based on Nonlinear Optical Wavelength-conversion at Room Temperature. J Infrared Milli Terahz Waves 35, 25–37 (2014). https://doi.org/10.1007/s10762-013-0041-0
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DOI: https://doi.org/10.1007/s10762-013-0041-0