封装DCG全息光学元件在不同温湿度条件下的波长特性研究  

Wavelength Properties of Sealed DCG Holograms under the Conditions of Different Temperature and Humidity

作　　者：刘玉杰[1,2] 李文强[2] 丁全心[2] 

机构地区：[1]光电控制技术重点实验室 [2]中航工业洛阳电光设备研究所,洛阳471009

出　　处：《科学技术与工程》2015年第17期1-3,17,共4页Science Technology and Engineering

基　　金：中国航空基金(20135169016)资助

摘　　要：DCG全息图通常采用环氧树脂胶密封来实现与环境中水分的隔离.在不同的温湿度条件下对封装后的DCG全息图波长特性做了一系列实验.实验表明：①高湿度环境不会对封装DCG全息图造成影响;②低于50℃的温度环境不会对全息图造成影响;③封装DCG全息图在70～85℃的温度环境下会发生峰值波长蓝移,蓝移速率与环境温度成正比;④环境温度高于100℃会对封装DCG全息图造成破坏,使得全息图颜色不均匀,甚至消像或者变性.对实验结果进行了讨论和分析,并根据实验结果和工艺经验提出提高全息图波长稳定性的措施：在适当的温度下对封装后的全息图进行烘烤.Holograms recorded in dichromated gelatin （DCG） are usually sealed with a glass plate cemented with an epoxy glue to protect the holograms from moisture in the environment. An investigation of the wavelength properties of sealed DCG holograms had been carried out paying attention to holograms which were exposed to different temperature and humidity environment. The investigation had revealed that （1） exposing the sealed DCG holo- grams to high relative humidity （ RH = 98% ） environment or immersing them in room-temperature water for 20 hours can not affect the holograms; （2） the sealed DCG holograms can be used at temperature below 50 ℃ without showing undue detrimental effects regarding their optical properties; （3） the peak wavelength of sealed DCG holo- grams can cause blue shift of several nanometers at 70 - 85 ℃ and the velocity of blue shift is proportional to the environmental temperature; （4） the holograms can be destroyed at 100 ℃ or above. The experimental results above will be analyzed and discussed. A method to improve the stability of sealed DCG holograms is proposed ： baking the sealed DCG holograms at proper temperature （e. g. , 85% in this study）.

关 键 词：全息 重铬酸盐明胶 全息光学元件 波长特性 稳定性 

分 类 号：O438.1[机械工程—光学工程]