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Efficient generation of Cherenkov-type terahertz radiation from a lithium niobate crystal with a silicon prism output coupler

: Theuer, M.; Torosyan, G.; Rau, C.; Beigang, R.; Maki, K.; Otani, C.; Kawase, K.


Applied Physics Letters 88 (2006), Nr.7, Art. 071122, 3 S.
ISSN: 0003-6951
ISSN: 1077-3118
Fraunhofer IPM ()
Cherenkov radiation; lithium compounds; silicon; optical prisms; optical couplers; submillimetre wave generation; magnesium compounds; spectral line broadening; submillimetre wave spectra

We report on the generation of broadband terahertz (THz) pulses using Cherenkov-type generation in magnesium oxide-doped lithium niobate (MgO:LN). The efficiency of the output coupling process of THz radiation at higher frequencies into free space is considerably increased by the use of a properly cut silicon prism. The achieved spectrum is broader compared to the normal Cherenkov-cut geometry. Due to a considerably reduced propagation length in the absorbing MgO:LN, the effective application of longer crystals is possible. Thus, the measured spectral in tensity is much higher and the spectrum broader.