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A PPKTP crystal was used to efficient green emission. Spectrum characteristics of FF and SH wave was analyzed, and phase-matching wavelength shift results from thermally-induced poling period shift. A conversion efficiency of 26.1% can be achieved.

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Using the plane-wave expansion method and finite element method, we investigate the properties of all-solid squarelattice photonic bandgap fibers. The comparison of different r/Λ values in the proposed fiber is convenient to optimize the fiber design. The simulation results demonstrate that the effective mode area of all-solid square-lattice photonic bandgap fibers is 1.25 times larger than triangular-lattice ones and the confinement loss of the fibers is no more than 0.1dB/m within the selected bandgap.