Simultaneous generation of red, green and blue light in room temperature periodically poled lithium niobate waveguides using single source

Complete modulational-instability gain spectrum of nonlinear quasi-phase-matching gratings

“…The most fundamental effect of a QPM grating, with a certain spectrum of spatial wave vectors, is to allow noncritical phase matching at all wavelengths for which the wave-vector mismatch ∆k matches a component of the grating spectrum. Thus QPM gratings allow for efficient multiple wavelength second harmonic generation (SHG) [4], which may, for example, be used for multiple-channel wavelength conversion [5].…”

Reducing photorefractive effect in periodically poled ZnO- and MgO-doped LiNbO3 wavelength converters

“…At least two different factors seemed to be involved in the building process. One possibility is that the sum frequency of the 1.55-m-range ASE and the 0.784-m-irradiation light was generated by a third-order QPM interaction, 9 and the sum-frequency light caused additional photorefractive change. In fact, we observed that a weak green light, whose wavelength was around 520 nm, was output from the waveguide.…”

Pulse shaping and compression by second-harmonic generation with quasi-phase-matching gratings in the presence of arbitrary dispersion

“…Consequently, the modulated nonlinear coefficient d(z) will be represented by only one relevant Fourier component, and from now on we will omit its QPM order subscript m. We note, however, that the ability to utilize different QPM orders of the same grating can be advantageous for phase matching several nonlinear processes simultaneously. [20][21][22][23][24][25]…”