Figure 1 | Scientific Reports

Figure 1

From: Efficient Second Harmonic Generation in 3D Nonlinear Optical-Lattice-Like Cladding Waveguide Splitters by Femtosecond Laser Inscription

Figure 1

The fabrication of optical-lattice-like cladding waveguides.

(a) The fabrication schematic plots of femtosecond laser-written optical-lattice-like cladding waveguides in KTP crystal. (b) The structures of optical-lattice-like cladding waveguides Nos. 1–4 in details. 2-I, II, III or 4-I, II, III is cross-sectional sketch of three part in waveguides Nos. 2 or 4., respectively. (c–f) The microscope images of input end face in optical-lattice-like cladding waveguides Nos 1–4, separately. (g–j) the microscope images of output end face in optical-lattice-like cladding waveguides Nos 1–4, separately.

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