We investigated Terahertz generation in organic crystals DSTMS, DAST and OH1 directly pumped by a Cr:forsterite laser at central wavelength of 1.25 mu m. This pump laser technology provides a laser-to-THz energy conversion efficiency higher than 3 percent. ...
Recent advances in high-harmonic generation gave rise to soft X-ray pulses with higher intensity, shorter duration and higher photon energy. One of the remaining shortages of this source is its restriction to linear polarization, since the yield of generat ...
Powerful THz radiation confined in one field period or less is an adequate tool for triggering nonlinear actions. We show results towards the realization of a tunable high-power THz source based on a laser-driven frequency conversion scheme in plasma and n ...
We studied the effects of cryogenic cooling of a 2-[ 3-(4hydroxystyryl)-5, 5-dimethylcyclohex-2-enylidene] malononitrile (OH1) crystal on the generation of broadband THz pulses via collinear optical rectification of 1350 nm femtosecond laser pulses. Coolin ...
We report on high-field terahertz transients with 0.9-mJ pulse energy produced in a 400 mm(2) partitioned organic crystal by optical rectification of a 30-mJ laser pulse centered at 1.25 mu m wavelength. The phase-locked single-cycle terahertz pulses cover ...
We present a bright and coherent soft x-ray source based on high harmonic generation delivering up to 10(10) photons per second centered at 120 eV within an 80 eV bandwidth. The source profits from fully phase-matched harmonic generation in an unmodulated ...
Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2013
We report on measurements of the instantaneous Kerr nonlinearity and the retarded alignment of non-polar molecules CO2, N-2, and O-2 by an intense, lambda-cubic terahertz pulse with peak field > 33 MV/cm centered at 3.9 THz. ...
Octave-spanning, 12.5 fs, (1.9 cycle) pulses with 115 mu J energy in the short-wavelength mid-infrared spectral range (1-2.5 mu m) have been generated via phase-mismatched cascaded nonlinear frequency conversion using organic DAST (4-N, N-dimethylamino-4 ' ...
We show that triangular selenium has excellent phase matching for THz generation through optical rectification in the range 0.1-4 THz. The performance exceeds that of the state-of-the-art organic crystals. ...
Transmission through a photoexcited semiconductor is used to temporally and spectrally shape a terahertz (THz) pulse. By adjusting the optical pump-THz probe delay, we experimentally introduce a polar asymmetry in the pulse profile as large as 92%. To shap ...
We study the interaction of intense THz magnetic fields with ferromagnetic thin films. At higher field intensities, the THz electric field starts playing a role, strongly changing the dielectric properties of the cobalt thin film. ...
High-energy pulses at 1.28 mu m are demonstrated by stimulated Raman scattering in hydrogen using two chirped pulses of a Ti: Sapphire laser. The Stokes pulse carrying record-high energy of 4.4 mJ is recompressed to 80 fs. ...
