Journal ArticleDOI
Self-pumped phase conjugation and four-wave mixing in 0 degrees - and 45 degrees -cut n-type BaTiO(3):Co.
TLDR
In this paper, the self-pumped phase conjugation is from internally seeded stimulated photorefractive backscattering and the four-wave-mixing rise time of the 45-deg-cut crystal is 4 ms with a reflectivity of 48 percent.Abstract:
Relatively fast self-pumped phase-conjugate and four-wave-mixing rise times are reported in n-type cobalt-doped barium titanate. With the crystal oriented in a 45-deg cut as compared with the same crystal in a 0-deg cut we find a factor of 3 decrease in the 0-90-percent rise time to 800 ms with 25-mW input power at 514.5 nm. Also, the self-pumped phase-conjugate reflectivity increases from 20 to 40 percent. We deduce that the phase conjugation is from internally seeded stimulated photorefractive backscattering. The four-wave-mixing rise time of the 45-deg-cut crystal is 4 ms with a reflectivity of 48 percent when the pumping beams are derived from self-pumped phase conjugation that has an input power of 25 mW.read more
Citations
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Journal ArticleDOI
Characterization of a photorefractive phase conjugator by optical low‐coherence reflectometry
TL;DR: In this article, the type, position and length of gratings inside a barium-titanate crystal producing self-pumped phase conjugation were measured with optical low coherence reflectometry.
Journal ArticleDOI
Self-pumped and incoherent phase conjugation in Fe-doped KNbO 3
TL;DR: In this paper, the self-pumped phase-conjugated reflectivities in KNbO3 crystals doped with Fe have been optimized in specially cut crystals, achieving reflectivities of as high as 60%.
Journal ArticleDOI
Reflection gratings in self-pumped phase-conjugate mirrors
TL;DR: In this article, a ring-cavity self-pumped phase-conjugate mirror is constructed around an Fe-doped KNbO3 crystal and the authors consider six possible two-wave mixing processes in the photorefractive crystal and select the crystal orientation that maximizes these couplings in the desired two wave mixing processes.
Journal ArticleDOI
High efficiency self-pumped phase conjugation from 45°-cut Ce:BaTiO3
TL;DR: In this article, the photorefractive performance of a 45°-cut BaTiO 3 crystal was investigated in a wide region of incident angles between −60° and +70° with a maximum reflectivity of 83.5%.
Journal ArticleDOI
Cross-polarized photorefractive four-wave mixing with extraordinary writing beams and an ordinary reading beam
TL;DR: The phase-matching properties of cross-polarized four-wave mixing with extraordinary writing beams and an ordinary reading beam are analyzed and the phase-conjugate reflectivity is obtained in consideration of phase mismatching.
References
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Journal ArticleDOI
Self-pumped, continuous-wave phase conjugator using internal reflection
TL;DR: Continuous-wave phase conjugation of an image-bearing beam is demonstrated using a single-domain crystal of BaTiO(3) and nothing else and has a phase-conjugate reflectivity of 30%.
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Theory of a self-pumped phase conjugator with two coupled interaction regions
TL;DR: In this paper, a plane-wave analysis of a self-pumped phase conjugator is presented, which uses four-wave mixing to produce the phase-conjugate replica of an incident optical wave.
Journal ArticleDOI
Optical phase conjugation by backscattering in barium titanate
TL;DR: In this paper, the authors demonstrate optical-beam phase conjugation by the process of two-beam coupling in photorefractive barium titanate and show that the incident, image-bearing beam causes exponential gain for counter-propagating waves, which are fed by noise and emerge with a power of the order of 10% of the incident beam.
Journal ArticleDOI
Continuous-wave self-pumped phase conjugator with wide field of view.
TL;DR: A self-pumped phase conjugator is demonstrated that operates over a wide field of view,phase conjugates separate images without cross talk, and when pumped by one incident beam will self-oscillate with mirrors placed in all four quadrants.
Journal ArticleDOI
Competition between forward- and backward-stimulated photorefractive scattering in BaTiO 3
TL;DR: In this article, the gain-length product for two-wave mixing in photorefractive BaTiO3 is calculated as a function of the angles between a pump beam and a scattered beam and the crystal c axis.