Cladding Waveguides in Aminoacid Crystal: Fabrication and Second Harmonic Generation

Cladding waveguides were inscribed in L-threonine aminoacid crystals by fs-laser pulses. Guided second harmonic generation was observed at 390 nm, with an efficiency of 1.3%(MW cm 2 ) −1 . Such results open new opportunities in organic nonlinear photonics.