title: Intense, carrier frequency and bandwidth tunable quasi single-cycle pulses from an organic emitter covering the Terahertz frequency gap.
abstract: In Terahertz (THz) science, one of the long-standing challenges has been the formation of spectrally dense, single-cycle pulses with tunable duration and spectrum across the frequency range of 0.1-15 THz (THz gap). This frequency band, lying between the electronically and optically accessible spectra hosts important molecular fingerprints and collective modes which cannot be fully controlled by present strong-field THz sources. We present a method that provides powerful single-cycle THz pulses in the THz gap with a stable absolute phase whose duration can be continuously selected between 68 fs and 1100 fs. The loss-free and chirp-free technique is based on optical rectification of a wavelength-tunable pump pulse in the organic emitter HMQ-TMS that allows for tuning of the spectral bandwidth from 1 to more than 7 octaves over the entire THz gap. The presented source tunability of the temporal carrier frequency and spectrum expands the scope of spectrally dense THz sources to time-resolved nonlinear THz spectroscopy in the entire THz gap. This opens new opportunities towards ultrafast coherent control over matter and light.
authors.affiliation: Paul Scherrer Institute, SwissFEL, 5232 Villigen PSI, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Vicario
authors.affiliation: Paul Scherrer Institute, SwissFEL, 5232 Villigen PSI, Switzerland.
authors.forename: B
authors.initials: B
authors.lastname: Monoszlai
authors.affiliation: Rainbow Photonics AG, 8048 Zurich, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Jazbinsek
authors.affiliation: Department of Molecular Science and Technology, Ajou University, Suwon 443-749, Korea.
authors.forename: S-H
authors.initials: SH
authors.lastname: Lee
authors.affiliation: Department of Molecular Science and Technology, Ajou University, Suwon 443-749, Korea.
authors.forename: O-P
authors.initials: OP
authors.lastname: Kwon
authors.affiliation: Paul Scherrer Institute, SwissFEL, 5232 Villigen PSI, Switzerland.|Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
authors.forename: C P
authors.initials: CP
authors.lastname: Hauri