202
F. Chen and J. R. V. de Aldana
Fig. 6.9 Typical pulsed laser in a laser-written Nd:YVO 4 waveguide based on graphene Qswitching: repetition rate, pulse duration, and pulse energy versus launched pump power. The
inset picture shows a typical pulse train [126]
6.5.4 Frequency Converters
Waveguides based on nonlinear crystals could be used to achieve second harmonic
generation (SHG) with enhanced efficiencies in comparison with the bulks. The
conversion efficiency depends not only on the bulk nonlinear features but also on the
guiding properties of the structures. The laser-written waveguides have been used
to realize SHG of light at a wavelength regime from ~400 to 790 nm through phase
matching (PM) or quasi-phase matching (QPM) configurations. Since waveguides
F. Chen and J. R. V. de Aldana
Fig. 6.9 Typical pulsed laser in a laser-written Nd:YVO 4 waveguide based on graphene Qswitching: repetition rate, pulse duration, and pulse energy versus launched pump power. The
inset picture shows a typical pulse train [126]
6.5.4 Frequency Converters
Waveguides based on nonlinear crystals could be used to achieve second harmonic
generation (SHG) with enhanced efficiencies in comparison with the bulks. The
conversion efficiency depends not only on the bulk nonlinear features but also on the
guiding properties of the structures. The laser-written waveguides have been used
to realize SHG of light at a wavelength regime from ~400 to 790 nm through phase
matching (PM) or quasi-phase matching (QPM) configurations. Since waveguides