Terahertz pulse generation from bulk GaAs by a tilted-pulse-front excitation at 1.8 um
Research Area: THz Linear and Nonlinear Phenomena Year: 2014
Type of Publication: Article  
Authors:
  • Blanchard, F.
  • Schmidt, B.E.
  • Ropagnol, X.
  • Thiré, N.
  • Ozaki. T.
  • Roberto Morandotti
  • Cooke, D.G.
  • Légaré, F.
 
Journal: Applied Physics Letters Volume: 105
Number: 24 Pages: 241106
Month: December
   
Abstract:
We report on terahertz (THz) generation via optical rectification in a room temperature gallium arsenide (GaAs) crystal pumped at a wavelength of 1.8 ?m using a modified tilted-pulse-front scheme, leading to a 0.05% energy conversion efficiency. The spectral content of the measured THz pulses, ranging from 0.1 to 3 THz, confirmed a good broadband phase matching between the pump and the THz pulses over several millimeters (>20 mm) in a semi-insulating ?110? cut bulk GaAs crystal. Our findings also suggest that the pump-to-THz conversion efficiency can be further increased by using a pump source with a narrower bandwidth.
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