Absorption-reduced waveguide structure for efficient terahertz generation

L. Pálfalvi, J. A. Fülöp, J. Hebling
2015 Applied Physics Letters  
An absorption-reduced planar waveguide structure is proposed for increasing the efficiency of terahertz (THz) pulse generation by optical rectification of femtosecond laser pulses with tiltedpulse-front in highly nonlinear materials with large absorption coefficient. The structure functions as waveguide both for the optical pump and the generated THz radiation. Most of the THz power propagates inside the cladding with low THz absorption, thereby reducing losses and leading to the enhancement of
more » ... the enhancement of the THz generation efficiency by up to more than one order of magnitude, as compared with a bulk medium. Such a source can be suitable for highly efficient THz pulse generation pumped by low-energy (nJ-lJ) pulses at high (MHz) repetition rates delivered by compact fiber lasers. V C 2015 AIP Publishing LLC. [http://dx.
doi:10.1063/1.4937347 fatcat:k5iyi52qrjfevjabp5cjrfnlaa