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- W2057492027 abstract "It is well known that lithium niobate (LiNbO<sub>3</sub>) has excellent characteristics for efficient tunable/broadband THz-wave generation. Over the last few years, we have investigated novel THz-wave sources based on MgO-doped LiNbO<sub>3</sub> (MgO:LiNbO<sub>3</sub>), and have succeeded in developing a tunable picosecond THz-wave source by using a novel pentagramshaped pump-enhancement cavity. One of the limiting factors in efficient THz-wave generation is the strong absorption by MgO:LiNbO<sub>3</sub> in THz-wave region. To overcome this problem, we employ a surface-emitted configuration which consists of a trapezoidal MgO:LiNbO<sub>3</sub> crystal and a pump-enhancement cavity folded in the shape of a pentagram. The pentagram-shaped cavity is designed for the noncollinear dual resonance of both pump and one of the down-converted waves. As a result, 1.5-ps pump pulses from a mode-locked Ti:sapphire laser operating at 780 nm allow tunable THzwave generation via parametric down-conversion resulting from stimulated phonon-polariton scattering in the MgO:LiNbO<sub>3</sub> crystal. By slightly translating the position of one of the cavity mirrors, we experimentally find that the THz-wave frequency is tunable in the range from 0.1 to 3.5 THz with the average output power of dozens of nanowatts. The maximum THz-wave average power is up to 40 nW around 2 THz at the pump power of 800 mW, which is several times higher than the THz-wave output generated by using rectangular MgO:LiNbO<sub>3</sub> crystals for Si-prism-coupled configuration under the same pump condition." @default.
- W2057492027 created "2016-06-24" @default.
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- W2057492027 date "2013-03-27" @default.
- W2057492027 modified "2023-09-23" @default.
- W2057492027 title "Tunable picosecond THz-wave generation based on trapezoidal MgO:LiNbO3crystal in novel pentagram-shaped pump-enhancement cavity" @default.
- W2057492027 doi "https://doi.org/10.1117/12.2001627" @default.
- W2057492027 hasPublicationYear "2013" @default.
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