光学学报, 1999, 19 (8): 1065, 网络出版: 2006-08-09
CO2激光局域热固定光折变全息的一种新方法
A New Method of Local Thermal Fixing by CO2 Laser
摘要
提出用CO2激光加热后记录固定的方案对LiNbO3晶体中的全息进行实时实地局域热固定。通过加载绝热体,利用连续激光加热晶体待固定区域局部范围至接近200℃,停止加热开始记录,至该区域温度降至100℃时,将固定一个体全息。文中给出了热传导模型及其数值解。由得到的初步结果参数进行了一系列实验。实验结果显示,应用这种方案可成功地对光折变全息进行实时实地局域热固定,并且具有温度更均匀的特点,所固定的全息质量有较大改善。
Abstract
A real-time and in-situ recording-fixing method after heating with CO2 laser beams is suggested to thermally fix a small local hologram in a bulk of Fe:LiNbO3 photorefractive crystal. With an insulator mantling the crystal, when two cw CO2 laser beams heat it to form a 200℃volume with the shape of Gauss beam, CO2 laser beams are blocked and Ar+ laser beams are used to record a photorefrative hologram, finally fixed a hologram in crystal before the temperature descended to 100℃. A heat transfer model and numeric solution are given. On the basis of simulation, a series of experimental result are obtained. Both experiment and theory analysis show that this scheme can fix a better hologram in real time and in situ, the temperature distribution is uniform.
李建郎, 刘立人, 郭迎春, 周常河. CO2激光局域热固定光折变全息的一种新方法[J]. 光学学报, 1999, 19(8): 1065. 李建郎, 刘立人, 郭迎春, 周常河. A New Method of Local Thermal Fixing by CO2 Laser[J]. Acta Optica Sinica, 1999, 19(8): 1065.