When two synchronized laser beams illuminate the inner surface of bulk lithium niobate crystals with magnesium doping(5%/mol MgO:LiNbO_(3))under the condition of total reflection,semi-degenerate four-wave mixing(FWM)i...When two synchronized laser beams illuminate the inner surface of bulk lithium niobate crystals with magnesium doping(5%/mol MgO:LiNbO_(3))under the condition of total reflection,semi-degenerate four-wave mixing(FWM)is generated.On this basis,a more sophisticated frequency conversion process on the interface of nonlinear crystal has been researched.The generation mechanism of FWM is associated with the fundamental waves reflected on the inner surface of the nonlinear crystal.Analysis of the phase-matching mechanism confirms that the FWM is radiated by the third-order nonlinear polarized waves,which are stimulated by the third-order nonlinear susceptibility coefficient of the nonlinear crystal.Theoretically calculated and experimentally measured corresponding data have been presented in this article.These results are expected to provide new inspiration for further experimental and theoretical research on frequency conversion in nonlinear crystals.展开更多
Nonlinear optical (NLO)materials are increaingly needed along with the development ofoptoelectronic technique. In recent years there has been a growth of interest in organic materialsfor their application in the field...Nonlinear optical (NLO)materials are increaingly needed along with the development ofoptoelectronic technique. In recent years there has been a growth of interest in organic materialsfor their application in the field of nonlinear optics. This is because organic double-frequencymaterials can have much higher nonlinear optical coefficients,shorter response times and higherlaser damage thresholds than inorganic materials.展开更多
The second-order nonlinear optical susceptibilities β, βμ, and third-order non-linear optical susceptibilities γ, 〈γ〉 of a series of the novel push-pull multi-ring electro-photo polymer intermediates have been ...The second-order nonlinear optical susceptibilities β, βμ, and third-order non-linear optical susceptibilities γ, 〈γ〉 of a series of the novel push-pull multi-ring electro-photo polymer intermediates have been calculated. The influences of molecular structure, donor, acceptor and the frequency of external field on β and γ, and the relationship between γ and the number of thiophene rings (i. e. conjugated chain length) have been studied using INDO/SCI methods combined with sum-overstate (SOS) formula. The calculated results show that γ is proportional to 2.69 power of the chain length of the conjugated molecular bonds when the length is not quite long.展开更多
基金This work was supported by the National Natural Science Foundation of China(Nos.61125503,61235009,and 61801520)the Foundation for Development of Science and Technology of Shanghai(No.13]C1408300)+1 种基金the Natural Science Foundation of Hunan Province(Nos.2019JJ50756 and 2018JJ3521)the Scientific Research Project of Hunan Province Education Department(No.20B144).
文摘When two synchronized laser beams illuminate the inner surface of bulk lithium niobate crystals with magnesium doping(5%/mol MgO:LiNbO_(3))under the condition of total reflection,semi-degenerate four-wave mixing(FWM)is generated.On this basis,a more sophisticated frequency conversion process on the interface of nonlinear crystal has been researched.The generation mechanism of FWM is associated with the fundamental waves reflected on the inner surface of the nonlinear crystal.Analysis of the phase-matching mechanism confirms that the FWM is radiated by the third-order nonlinear polarized waves,which are stimulated by the third-order nonlinear susceptibility coefficient of the nonlinear crystal.Theoretically calculated and experimentally measured corresponding data have been presented in this article.These results are expected to provide new inspiration for further experimental and theoretical research on frequency conversion in nonlinear crystals.
文摘Nonlinear optical (NLO)materials are increaingly needed along with the development ofoptoelectronic technique. In recent years there has been a growth of interest in organic materialsfor their application in the field of nonlinear optics. This is because organic double-frequencymaterials can have much higher nonlinear optical coefficients,shorter response times and higherlaser damage thresholds than inorganic materials.
基金Project supported by the National Natural Science Foundation of China (No. 29890210)
文摘The second-order nonlinear optical susceptibilities β, βμ, and third-order non-linear optical susceptibilities γ, 〈γ〉 of a series of the novel push-pull multi-ring electro-photo polymer intermediates have been calculated. The influences of molecular structure, donor, acceptor and the frequency of external field on β and γ, and the relationship between γ and the number of thiophene rings (i. e. conjugated chain length) have been studied using INDO/SCI methods combined with sum-overstate (SOS) formula. The calculated results show that γ is proportional to 2.69 power of the chain length of the conjugated molecular bonds when the length is not quite long.
