title: Far-infrared second-harmonic generation and pulse characterization with the organic salt DAST.
abstract: We generated the second harmonics of pulses in the far-infrared region (30-55 microm), using the organic salt dimethylamino-4-N-methylstilbazolium tosylate (DAST). We demonstrate that DAST can be used to characterize ultrashort pulses in a spectral region where no other materials are available. To illustrate the need for such characterizations, we show the effects of propagation through air on the shape of ultrashort far-infrared pulses.
authors: N A
authors: NA
authors: van Dantzig
authors: P C
authors: PC
authors: Planken
authors: H J
authors: HJ
authors: Bakker