Bochum 2015 – wissenschaftliches Programm
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K: Fachverband Kurzzeitphysik
K 4: Lasersysteme und deren Anwendungen II
K 4.6: Vortrag
Dienstag, 3. März 2015, 15:40–16:00, HZO 40
Terahertz time domain spectrometer to characterize nonlinear materials for efficient terahertz generation — •Frederike Ahr1,2, Sergio Carbajo1,2, Giovanni Cirmi1, Oliver D. Mücke1, Xiaojun Wu1, and Franz X. Kärtner1,2,3 — 1Center for Free Electron Laser Science, and Deutsches Elektronen Synchrotron, Notkestraße 85, 22607 Hamburg, Germany — 2Department of Physics, University of Hamburg, 22761 Hamburg, Germany — 3Department of Electrical and Computer Engineering, and Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
Strong-field THz radiation is essential to several applications such as terahertz (THz) time-resolved spectroscopy and electron acceleration. Optical rectification in nonlinear materials such as lithium niobate (LN), lithium tantalate (LT) and serveral organic crystals, hold promise in energy scalabilty of single-cycle THz generation. Fundamental properties of these materials are yet unexplored or poorly reported in this wavelength regime. We investigate the spectroscopic properties of nonlinear materials employed for broadband THz generation with an in-house THz time-domain spectrometer (THz-TDS) -based on a 85 MHz Ti:Sapphire oscillator with 400 mW average power and 50 fs pulse duration. We employ our THz-TDS to study the absorptive, reflective, and amplitude/phase properties of LN and LT at cryogenic- and room-temperature. We also report experimental results of strong-field THz generation optimized from our nonlinear materials study.