Ultra-Broadband Visible and Infrared Light Generation Driven by Far Infrared Light in the Broad Region from 8{\mu}m to 240{\mu}m - Archive ouverte HAL
Pré-Publication, Document De Travail Année : 2022

Ultra-Broadband Visible and Infrared Light Generation Driven by Far Infrared Light in the Broad Region from 8{\mu}m to 240{\mu}m

Nils W. Rosemann
  • Fonction : Auteur
Robin C. Döring
  • Fonction : Auteur
Eike Dornsiepen
  • Fonction : Auteur
Jürgen Belz
  • Fonction : Auteur
Johannes Haust
  • Fonction : Auteur
Felix Bernhardt
  • Fonction : Auteur
Ferdinand Ziese
  • Fonction : Auteur
Stephan Winnerl
  • Fonction : Auteur
Harald Schneider
  • Fonction : Auteur
Manfred Helm
  • Fonction : Auteur
Stefanie Dehnen
  • Fonction : Auteur
Kerstin Volz
  • Fonction : Auteur
Simone Sanna
  • Fonction : Auteur
Sangam Chatterjee
  • Fonction : Auteur

Résumé

The most commonly used nonlinear optical process is the conversion of infrared light at 1064nm to green light at 532nm, as performed in common laser pointers. However, more relevant for future applications are nonlinear optical processes that generate a broad spectrum, a so called supercontinuum. A desirable goal is generating a spectrum that covers the whole visible range (400 -900nm), i.e., white light. Nowadays, white-light generation is usually achieved in specially designed photonic fibres requiring high laser intensities. However, in previous studies we showed that amorphous powders of $(PhSn)_4S_6$ cluster-molecules generate white light when they are irradiated by low-intensity near-infrared light. In this study, we use the mid- and far-infrared radiation of a free-electron laser to investigate the same molecules. White-light generation is observed for excitation with wavelength between 8 and 240$\mu$ m. While the emitted radiation shows only slight variations, its intensity strongly depends on the excitation wavelength. We then match the wavelength dependent efficiency with the infrared absorption spectra of the material. This comparison shows: whenever the excitation can introduce molecular vibrations, less white light is generated. For all other wavelengths the excitation interacts mostly with the electron system. This shows that the electron system and the molecular backbone are decoupled to a large extent. Our work contributes to the understanding of the nonlinear process that underlies white-light generation in $(PhSn)_4S_6$ cluster molecules. Additionally, it shows the high potential of this material in applications where a broad laser spectrum is desired.

Dates et versions

hal-03658587 , version 1 (04-05-2022)

Identifiants

Citer

Claudio Attaccalite, Nils W. Rosemann, Robin C. Döring, Eike Dornsiepen, Jürgen Belz, et al.. Ultra-Broadband Visible and Infrared Light Generation Driven by Far Infrared Light in the Broad Region from 8{\mu}m to 240{\mu}m. 2022. ⟨hal-03658587⟩
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