Full text loading...
face micrographs of poled crystal with the octagonal quasiperiodic superlattice. The single-line and double-line arrows indicate the collinear and noncollinear second-harmonic outputs, respectively.
(a) The diffraction patterns of nonlinear crystal with its local eightfold axis parallel to the He–Ne beam. (b) Schematic view of the reciprocal vectors. The arrows (,2,3,4) indicate the four basic reciprocal vectors, in which the direction of input and output beams is along in the collinear QPM harmonic generations.
Average output power of collinear quasiphase matched second harmonics as a function of average input power. Squares and dots give the experimental results of the fundamental wavelength 1.195 and , respectively. The curves are the quadratic fits.
The distribution of QPM second-harmonics generated at three input wavelengths: (a) 1.19, (b) 1.187 and (c) . At the bottom, three pairs of reciprocal vectors used at these wavelengths are shown in the reciprocal space.
Article metrics loading...