Journal
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
Volume 9, Issue 9, Pages S334-S338Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1464-4258/9/9/S08
Keywords
nonlinear generation; nonlinear diffraction; nonlinear photonic crystal; domains
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A spontaneously grown randomized nonlinear photonic crystal structure formed by 180 degrees domains has been detected in strontium tetraborate via nonlinear diffraction. Domains have the form of sheets lying in the bc crystallographic plane with the domain walls oriented perpendicularly to the a crystallographic axis. The effective thickness of domains contributing to the nonlinear diffraction is determined from the Fourier spectrum of inverse superlattice vectors, and it falls within the range 180 nm to 6 mu m. Nonlinear diffraction at the third harmonic frequency was observed in the same crystal sample.
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