Abstract
Lithium niobate is the most popular material for terahertz wave generation via stimulated polariton scattering (SPS), previously known to have a gain peak near 2THz. Here we report the discovery of another phase-matched gain peak near 4THz in lithium niobate, which greatly extends the useful gain spectrum of lithium niobate. Despite the relatively high 4THz absorption in lithium niobate, the 4THz SPS becomes dominant over the 2THz one in an intensely pumped short lithium niobate crystal due to less diffraction-induced absorption and mode-area mismatch. We also demonstrate a signal-seeded OTPO that generates 1.4nJ at 4.2THz from lithium niobate with 17.5mJ pump energy.
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