Sun Daliang

Self-pumped phase conjugation in (K0.5Na0.5)2y (Sr0.61Ba0.39)1-yNb2O6 at 633nm

Self-pumped phase conjugation has been observed in Ce-doped (K0.5Nb0.5)2y (Sr0.61Ba0.39)1-yNb2O6 (KNSBN) crystal at 633nm by using He-Ne laser. The phase conjugate reflectivity as high as 40% was measured. The reflectivity as function of incident angles and the relation of response time to the incident intensities were studied experimentally.

Photorefractive Self-Bending and High-Performance KNSBN:Cu Crystal Self-Pumped Phase-Conjugator

The mechanism for the high-performance KNSBN:Cu crystal self-pumped phase-conjugator is first put forward in this letter as no-loop photorefractive self-bending succesive four-wave mixing interaction. And the photorefractive backscattering amplification was found to play a very important role in it.

Growth and two-wave coupling properties of potassium sodium strontium barium niobate with A-sites not fully-occupied

This paper reports the growth and two-wave coupling properties of (K0.5-Na0.5)2z (Sr0.75Ba0.25)1-xNb2O6(z=0.1, 0.05 and 0.03) crystals. Comparing to the others, the crystal at z=0.05 has shorter response time and larger two-wave coupling gain coefficient. The gain coefficient of it surpasses that of SBN:Ce.

Image Intensity Inversion Operation Using KNSBN:Cu Crystal Self-Pumped Phase-Conjugator

The image intensity inversion operation was succeeded by using the new type KNSBN:Cu crystal self-pumped phase-conjugate mirror. The new phase-conjugator was demonstrated to have the reguired specifications for this optical processing application.

Growth and High Reflectivity Self-Pumped Phase Conjugate of Cu-Doped KNSBN Crystal

The Cu-doped KNSBN crystals have been grown. The self-pumped phase conjugate mirrors of Cu-doped KNSBN crystals have been demonstrated. The phase conjugate reflectivity reaches as high as 68% for the crystal with 0.04 wt.% Cu-doped. The phase conjugate reflectivity and its response time were also measured as a function of the argon-ion laser wavelengths.

Self-Pumped Phase Conjugation of Co-Doped (KNa)0.1 (Sr0.75Ba0.25)0.9Nb2O6 Crystal

Self-pumped phase conjugate in trapezoid-cut Co-doped (KNa)0.1 (Sr0.75Ba0.25)0.9Nb2O6 (Co-KNSBN) crystal was demonstrated without external reflection mirrors and applied field, phase conjugation reflectivities as high as 40.5% were measured. The threshold power was lower than 0.02 W/cm2. The device was operated in one-region four-wave mixing using the photorefractive effect.

Temperature Effect in (K0.5Na0.5)0.2(Sr0.75Ba0.25)0.9Nb2O6: Cu Crystal Self-Pumped Phase-Conjugator

A reflectivity of 45% of the self-pumped phase-conjugate wave in (K0.5-Na0.5)0.2(Sr0.75Ba0.25)0.9Nb2O6:Cu crystal at the environmental temperature T ~ 70°C has been obtained. The temperature effect in this kind of self-pumped phase-conjugator is studied.

GROWTH AND PHOTOREFRACTIVE PROPERTIES OF KNSBN:Co CRYSTAL

Growth and photorefractive properties of KNSBN:Co crystal are reported for the the first time.Crystals were grown by CZ technique and the growth habits of them are severly affected by the amount of Co ions.New energy levels are formed in the energy band gap. Comparing to undoped KNSBN, KNSBN:Co has larger two-wave coupling coefficient, shorter response time and larger photo-induced free electron concentration in the experiment of two-wave coupling. Phase conjugation reflectivity of 56% and response time of 150ms were determined in the experiment of degenerate four-wave mixing.

Chaos in an Ar+ Composite Resonator Laser Using KNSBN:Cu Crystal Self-Pumped Phase-Conjugator

Observation of the dynamics in a single-mode Ar+ composite resonator laser using KNSBN:Cu crystal self-pumped phase-conjugator is reported. The sequence of instabilities occurring on gain change corresponds to the transition to chaos of the logistic equation. Period-doubling route to chaos, and period-5, -3, -3×2 and -2 together with -3 windows in the chaotic range were observed. The strange attractor which is similar to that of the forced Duffing equation is obtained by reconstructing phase-space pictures of the system.

Real-Time Edge Enhancement Using KNSBN at 633 nm

Edge enhancement has been performed in Ce-doped (K0.5Na0.5)2y (Sr0.61Ba0.39)1-yNb2O6 (KNSBN) crystal at 633 nm with low incident-light intensities (10-3 W/cm2). We calculated the expected images which show good agreement with the images that we have experimentally observed.