We investigated Terahertz generation in organic crystals DSTMS, DAST and OH1 directly pumped by a Cr:forsterite laser at central wavelength of 1.25 μm. This pump laser technology provides a laser-to-THz energy conversion efficiency higher than 3 percent. Phase-matching is demonstrated over a broad 0.1-8 THz frequency range. In our simple setup we achieved hundred μJ pulses in tight focus resulting in electric and magnetic field larger than 10 MV/cm and 3 Tesla.
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- Second-harmonic generation (SHG) is an important technique for producing light, particularly useful at short IR/visible wavelengths, but struggles with longer IR wavelengths like 1300, 1550, and 2000 nm.
- This study examines three organic materials—DAST, DSTMS, and PNPA—that have shown efficient performance for SHG at these longer IR wavelengths.
- These organic crystals have been found to outperform the traditional inorganic beta-barium borate (BBO) in generating SHG using IR pump wavelengths.
We investigated Terahertz generation in organic crystals DSTMS, DAST and OH1 directly pumped by a Cr:forsterite laser at central wavelength of 1.25 μm. This pump laser technology provides a laser-to-THz energy conversion efficiency higher than 3 percent.
View Article and Find Full Text PDFLinear and second-order nonlinear optical properties of ionic organic crystals.
J Chem Phys
September 2014
Laboratoire de Chimie Théorique, University of Namur, rue de Bruxelles, 61, B-5000 Namur, Belgium.
The linear and second-order nonlinear optical susceptibilities of three ionic organic crystals, 4-N,N-dimethylamino-4'-N'-methyl-stilbazolium tosylate (DAST), 4-N,N-dimethylamino-4'-N'-methyl-stilbazolium 2,4,6-trimethylbenzenesulfonate (DSTMS), and 4-N,N-dimethylamino-4'-N'-phenyl-stilbazolium hexafluorophosphate (DAPSH), have been calculated by adopting a two-step multi-scale procedure, which consists in calculating: (i) the ion properties using ab initio or density functional theory methods and then (ii) in accounting for the crystal environment effects using classical electrostatic models. Provided that the ionic properties are evaluated at the second-order Møller-Plesset level and that the dressing field effects using point charges are accounted for, the agreement with experiment is excellent and enables to explain the origin of the larger χ((2)) response of DAPSH with respect to DAST and DSTMS. The study has also demonstrated that including the dressing field leads to a decrease of the χ((2)) response of ionic crystals whereas its effect is opposite for molecular crystals.
View Article and Find Full Text PDFHigh-energy terahertz pulses are produced by optical rectification (OR) in organic crystals 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) and 4-N, N-dimethylamino-4'-N'-methyl-stilbazolium 2,4,6-trimethylbenzenesulfonate (DSTMS) by a Ti:sapphire amplifier system with 0.8 μm central wavelength. The simple scheme provides broadband spectra between 1 and 5 THz, when pumped by a collimated 60 fs near-IR pump pulse, and it is scalable in energy.
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