卫校毕业论文

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'卫校毕业论文'
卫校毕业论文【英文摘! The reversible isomerization of trans?cis?trans under the linear polarization light, the molecules of Azo Materials have the same tropism which is vertical to the polarization of light? This presents Azo Materials anisotropy in macro scope, which means that it has photo-induced birefringence. The value of birefringence relates to optical power and the polarization angle of the light. It means we can change the birefringence of Azo Materials through modifying the status of light? Based on the characteristic, we design a new type of OPS-VECSEL which controls the polarization and frequency of the ejection laser by using Azo Materials as the optical control layer. The structure model is DBR/ Azo Materials layer /active layer/DBR. (Fig. 1) Design of DBR layerOrdinary OPS-VECSEL has a structure of single DBR, which means that one end use eject io n mirror with reflectio n ability, the other end use the DBR. We use asymmetry double DBR in our Azo OPSVECSEL. The growing sequence is H?L?H, and central wavelength is 600nm.Design of Optical control layerDifferent needs make us select different Azo material. There is absorption between 200-52Onm and strong absorption at 488nm? We just consider the strong absorption at 488nm for simplification. Therefore we use light at the wavelength of 488nm as control light. The birefringenee value of optical control layer will change when changing the intensity and polarization. Design of the active layer According to research of Wang lijun group in Cl OMR PVK: ALq: DCM1 mixture as the active medium, Ar+ laser at the wavelength of 514.5nm as the pump laser, with 45°incidenee angle.Analysis of controlling polarization and frequency of Azo Materials OPS-VECSELWe introduce the Azo materials into the res on ator of OPS-VECSEL torealize optical control function. Through the reversible isomerization of trans-cis-trans under the linear polarization light, the molecules of Azo materials have the same tropism which is vertical to the polarization of light. This presents anisotropy of Azo materials in macroscope, which means that it has photo-induced birefringenee. Based on the photo-induced birefringenee effect of Azo materials, we could control the polarization and frequency of the ejection laser by using Azo materials as the optical control layer.Perfect VECSEL can be treated as isotropy medium; the fundame ntal mode in resona nt cavity is two orthog onal modes ? We call them P-polarization comp on ent and S-polarization component. The electromagnetic waves are shown like We should consider establishing the characteristic matrix of optical control I aye 匚 Through the reversible isomerizati on of trans-cis-tra ns under the linear polarization light, the molecules of Azo materials have the same tropism which is vertical to the polarization of light. This presents Azo materials anisotropy in macroscope, which means that it has birefringence. There are an effective index n? which is parallel to the polarization of pum
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卫校 毕业论文
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