A reflectivity of 45%of the self-pumped phase-conjugate wave in (K_(0.5)Na_(0.5))_(0.2)(Sr_(0.75)Ba_(0.25))_(0.9)Nb_(2)0_(6)-Cn crystal at the environmental temperature T~70℃ has been obtained.The temperature effect ...A reflectivity of 45%of the self-pumped phase-conjugate wave in (K_(0.5)Na_(0.5))_(0.2)(Sr_(0.75)Ba_(0.25))_(0.9)Nb_(2)0_(6)-Cn crystal at the environmental temperature T~70℃ has been obtained.The temperature effect in this kind of self-pumped phase-conjugator is studied.展开更多
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 photore f...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 photore fractive backscattering amplification was found to play a very important role in it.展开更多
We found that drift-length of light-excited electrons L0 has influence upon the light-induced scattering in LiNbO_(3):Fe crystal.We proposed that one of the necessary conditions for steady-state light-induced scatteri...We found that drift-length of light-excited electrons L0 has influence upon the light-induced scattering in LiNbO_(3):Fe crystal.We proposed that one of the necessary conditions for steady-state light-induced scattering is D>L0(where D is the illumination beam size).展开更多
Weak images,which pass through two kinds of suspension media with sizes of randomly-moving suspension particles about 0.05-0.1 cm and 0.01-0.001 cm respectively,are deteriorated by light scattering of particles,but re...Weak images,which pass through two kinds of suspension media with sizes of randomly-moving suspension particles about 0.05-0.1 cm and 0.01-0.001 cm respectively,are deteriorated by light scattering of particles,but restored and amplified effectively by two-wave mixing in photorefractive crystals with different time constants.展开更多
The lens-like effects,both photorefractive effect and thermo-optical effect,were studied in the LiNbO_(3):Fe sheet.The threshold light intensity above which the photorefractive effect was overwhelmed b-v the thermal e...The lens-like effects,both photorefractive effect and thermo-optical effect,were studied in the LiNbO_(3):Fe sheet.The threshold light intensity above which the photorefractive effect was overwhelmed b-v the thermal effect was determined and the thermo-optical coefficient dn/dT is evaluated by the Z-scanning method.The limiting characteristics of LiNbO_(3):Fe sheet is examined.展开更多
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 op...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.展开更多
基金Supported by the National Natural Science Foundation of China.
文摘A reflectivity of 45%of the self-pumped phase-conjugate wave in (K_(0.5)Na_(0.5))_(0.2)(Sr_(0.75)Ba_(0.25))_(0.9)Nb_(2)0_(6)-Cn crystal at the environmental temperature T~70℃ has been obtained.The temperature effect in this kind of self-pumped phase-conjugator is studied.
基金Supported by the National Natural Science Foundation of ChinaTianjin Science Foundation for Youth.
文摘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 photore fractive backscattering amplification was found to play a very important role in it.
文摘We found that drift-length of light-excited electrons L0 has influence upon the light-induced scattering in LiNbO_(3):Fe crystal.We proposed that one of the necessary conditions for steady-state light-induced scattering is D>L0(where D is the illumination beam size).
基金a grant for key research project in Climbing Program from the State Science and Technology Commission of China.
文摘Weak images,which pass through two kinds of suspension media with sizes of randomly-moving suspension particles about 0.05-0.1 cm and 0.01-0.001 cm respectively,are deteriorated by light scattering of particles,but restored and amplified effectively by two-wave mixing in photorefractive crystals with different time constants.
基金Supported by a grant for Key Research Project in Climbing Program from tlie State Science and Technology Commission of China.
文摘The lens-like effects,both photorefractive effect and thermo-optical effect,were studied in the LiNbO_(3):Fe sheet.The threshold light intensity above which the photorefractive effect was overwhelmed b-v the thermal effect was determined and the thermo-optical coefficient dn/dT is evaluated by the Z-scanning method.The limiting characteristics of LiNbO_(3):Fe sheet is examined.
文摘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.
