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A new type of tilted-pulse-front pumped terahertz (THz) source has beendemonstrated, which is based on a lithium niobate plane-parallel slab with anechelon structure on its input surface. Single-cycle pulses of 1 microjouleenergy and 0.30 THz central frequency have been generated with 0.05% efficiencyfrom such a source. One order-of-magnitude increase in efficiency is expectedby pumping a cryogenically cooled echelon of increased size and thickness witha Ti:sapphire laser. The use of a plane-parallel nonlinear optical crystal slabenables straightforward scaling to high THz pulse energies and to produce asymmetric THz beam with uniform pulse shape for good focusability and highfield strength.

Demonstration of a Tilted-Pulse-Front Pumped Plane-Parallel Slab Terahertz Source