Nonlinear optical terahertz wave sources |
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Authors: | K Kawase K Suizu S Hayashi and T Shibuya |
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Institution: | 1.Nagoya University, Ecotopia, Furocho,Nagoya,Japan;2.RIKEN,Sendai,Japan |
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Abstract: | We developed a Cherenkov phase-matching method for monochromatic THz-wave generation using the DFG, process with a lithium
niobate crystal, which resulted in both high conversion efficiency and wide tunability. Although THz-wave generation by Cherenkov
phase matching has been demonstrated using femtosecond pumping pulses, producing very high peak power, these THz-wave sources
are not monochromatic. Our method generates monochromatic and tunable THz, waves using a nanosecond pulsed laser source. We
also show that Cherenkov radiation with waveguide structure is an effective strategy for achieving extremely wide tunable
THz-wave source. We fabricated MgO-doped lithium niobate slab waveguide and demonstrated difference frequency generation of
THz-wave generation with Cherenkov phase matching. Extremely frequency-widened THz-wave generation, from 0.1 to 7 THz was
observed. |
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Keywords: | |
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