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The Study of the Two Waves Coupling Property of Ce:KNSBN Photorefractive Crystal Using Orthogonally Polarized Light

Author: ZhangYunYing
Tutor: GuoQingLin
School: Hebei University
Course: Optics
Keywords: Photorefractive Ce: KNSBN Orthogonal polarization Dynamic characteristic Light fanning effect Two wave coupling
CLC: O734
Type: Master's thesis
Year: 2008
Downloads: 2
Quote: 0
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In this paper, the wavelength of 632.8nm He-Ne laser and a wavelength of 532nm single-frequency laser as written all solid light source, light detection using real-time data acquisition and processing system , by changing the polarization direction of the pump light and the crystal c-axis angle φ and systematic study of the different φ angle single pump light beam transmitted light intensity I_p the time evolution of the situation and found that when φ lt; 300 , the basic beam fanning effect does not exist ; simultaneously read out in a non- two-wave coupling device under test studied the orthogonal polarization to write the next Ce: KNSBN crystal two wave coupling dynamic process of signal light , pumping light beam fanning the time evolution and found time to write orthogonally polarized fan noise has been significantly inhibited. Further experimental study of orthogonal polarization write the next Ce: KNSBN crystal two -wave coupling gain coefficient , diffraction efficiency , response time varies with different writing beam parameters were studied. Experimental results show that , under the same experimental conditions , the orthogonal polarization diffraction gratings written improved efficiency and gain coefficients , the write light intensity ratio mo = 0.33, the total light intensity of the writing light I0 = 60mW/cm2 , writing light angle of 30 . When the maximum write orthogonal polarization diffraction efficiency ratio when the optical writing e 33.8% increase ; write total light intensity is constant, the writing at the same light intensity ratio , the use of He-Ne 632.8nm orthogonally polarized laser and use when writing the response time significantly less than e light , when m0 = 0.02 , the orthogonal polarization write response time is about 38s, but when writing e light 80s, while the use of 532nm laser as a writing and using orthogonal polarized light onto the crystal response time significantly shorter , indicating that photorefractive crystal response time of existence of two waves coupling wavelength selectivity. Finally, in the orthogonal polarization write Ce: KNSBN crystal holographic storage experiments carried out under improved reproduced image signal to noise ratio .

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CLC: > Mathematical sciences and chemical > Crystallography > Crystal physics > The optical properties of the crystal
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