Abstract
By experimental measurements and theoretical analyses, we demonstrate the control of modulation instability in photorefractive crystals though the intensity ratio of coherent background to signal fields. Appearance, suppression, and disappearance of modulated stripes are observed in a series of spontaneous optical pattern formations, as the intensity of input coherent beam increases. Theoretical curves based on the band transport model give good agreement to experimental data, both for different bias voltages and different intensity ratios.
Highlights
Christodoulides, “Modulational instability of quasi-plane-wave optical beams biased in photorefractive crystals,” Opt
Even though Modulation instability (MI) had been reported with biased photorefractive crystals a decade ago [7], until recently the existence of optical pattern transitions from MI in the uniform background to transverse instability in quasi two-dimensional structure is demonstred [8, 9]
We demonstrate the control of MI in photorefractive crystals experimentally and theoretically, by varying the ratio of background to signal intensities
Summary
N. Christodoulides, “Modulational instability of quasi-plane-wave optical beams biased in photorefractive crystals,” Opt. Commun. “Optical Pattern Transitions from Modulation to Transverse Instabilities in Photorefractive Crystals,” Phys. N. Christodoulides, “Modulation instability and pattern formation in spatially incoherent light beams,” Science 290, 495 (2000).
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