Generation of tunable Fourier-transform-limited terahertz pulses in 4-N,N-dimethylamino-4′-N′-methyl stilbazolium tosylate crystals

Jinjun Liu; Merkt, Frédéric
September 2008
Applied Physics Letters;9/29/2008, Vol. 93 Issue 13, p131105
Academic Journal
We report difference-frequency generation (DFG) of widely tunable, pulsed, Fourier-transform-limited terahertz radiation (bandwidth of ∼10 MHz, peak power up to ∼400 μW) from pulse-amplified near-infrared (λ∼800 nm) laser radiation using a crystal of the organic salt 4-N,N-dimethylamino-4′-N′-methyl stilbazolium tosylate (DAST) cut along the b axis to fulfill the phase-matching condition. The broad tunability and narrow bandwidth of the terahertz radiation generated by DFG in DAST are illustrated by a single scan of the terahertz spectrum of H2O from 0.1 to 11 THz, and a recording of the absorption spectrum of a pure rotational transition of HF near 5 THz.


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