We demonstrate experimentally an efficient terahertz emitter that consists of a 20 µm thick layer of LiNbO clamped between a fused silica substrate and a Si semicone. A focused laser beam from an ultrafast optical oscillator propagates in the LiNbO layer and emits a Cherenkov cone of terahertz radiation to the Si semicone. The radiation is totally internally reflected by the semicone's convex surface and escapes the semicone through its base as a collimated beam. By pumping the emitter with 7 nJ Ti:sapphire laser pulses, terahertz radiation with the spectrum as wide as ∼6 THz was generated with a record high efficiency of 0.06 for oscillators.
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