Obiettivo The aim of this project is to apply a tuneable, 10 microns, short pulse, high power emission to study both the second harmonic generation (SHG) and third harmonic generation (THG) in different gases (SF6, CH4), new materials (nematic crystals, fullerens), polymers and semiconductors. Under strong power infrared lighting, the weak non-linear emissions (transmitted or reflected by the materials) will be filtered and analysed, in the time and frequency domain, to derive the non-linear polarizability and relaxation time. Besides this, to extend this infrared non-linear spectroscopy in another frequency range, the 10 microns pumping sources will be converted in the 5 microns region, by means of efficient non-linear materials as proustite.To attain this objective a tuneable 10 microns laser will be built, totally free from spurious non-linear signals and with a few-nanosecond pulse duration. In a further approach a CO2 amplified, picosecond ten microns pulse will be obtained by means of parametric conversion of a near infrared source, so that the dynamics of the non-linear effects can be analysed in the picosecond range. Alternatively, the ten microns sub-nanosecond pulse can be directly extracted from a high pressure CO2 oscillator by means of a neodymium laser. All these sources will be converted at 5 microns wavelength to perform the same non-linear spectroscopy in another frequency range. Programma(i) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Argomento(i) 12 - Atomic Structure, Lasers and Optics Invito a presentare proposte Data not available Meccanismo di finanziamento Data not available Coordinatore Consiglio Nazionale delle Ricerche (CNR) Contributo UE Nessun dato Indirizzo Via del Giardino 7 56100 Pisa Italia Mostra sulla mappa Costo totale Nessun dato Partecipanti (3) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Moscow State University M.V. Lomonosov Russia Contributo UE Nessun dato Indirizzo 119899 Moscow Mostra sulla mappa Costo totale Nessun dato Università degli Studi di Napoli Federico II Italia Contributo UE Nessun dato Indirizzo 80055 Portici Napoli Mostra sulla mappa Costo totale Nessun dato Universität Regensburg Germania Contributo UE Nessun dato Indirizzo 93053 Regensburg Mostra sulla mappa Costo totale Nessun dato