低强度激光准弹性光散射实验研究3.pdfVIP

光 电 子 ·激 光 第 14 卷 第 5 期 　2003 年 5 月 Vol. 14 No. 5 　May 2003 　　　　　 J ournal of Optoelectronics ·Laser 　　　　　　　 ·生物医学光子学· 低强度激光准弹性光散射实验研究 李绍新 , 邢 　达 , 谭石慈 (华南师范大学激光生命科学研究所 ,广东 广州 510631) 摘要 :建立了小型实用的低强度激光准弹性光散射实验装置 ,并侧重考虑了其光源、样品池和探测器的 选择和设计。实验结果表明 ,用低功率的 HeNe 管能够满足实验要求 ;设计的双层折射率样品匹配池能 减少杂散光 ;用梯度折射率单模光纤代替针孔光阑能极大地提高散射光的收集、传输效率。分析得出 , 引起实验结果偏差的原因是基线测量的误差和样品中偶然的灰尘的影响。 关键词 :准弹性光散射 ; 线宽 ; 粒径测量 ( ) 中图分类号:O432. 2 ;R318. 51 　　文献标识码 :A 　　文章编号 2003 Experimental Study on Quasielastic Light Scattering with Lowintensity Lasers LI Shaoxin , XING Da , TAN Shichi ( ) Institute of Laser Life Science ,South China Normal University ,Guangzhou 510631 ,China Abstract :A novel compact system for quasielastic laser light scattering experimental with lowintensity laser was designed and established. During the designation the selection of light source ,sample cell and detector were carefully considered according to the purpo se of the applications. A biolayer index match cell can largely decrease scattering from windows and a gradientindex single mode fiber replacing the pinhole di aphragm greatly improve the collecting and transmitting efficiency of scattering photons from pumping zoon. The result of experiment indicates that ,the system can well meet the experimental requirements at the pre sent designation model. The some deviation on experiment