光学学报, 2012, 32 (8): 0816001, 网络出版: 2012-06-11
光热敏折变玻璃及其布拉格体光栅特性研究
Characteristics on the Photo-Thermal-Refractive Glass and Volume Bragg Gratings
材料 布拉格体光栅 光热敏折变 析晶特性 角选择滤波 materials volume Bragg grating photo-thermo-refractive crystallization properties angular filtering
摘要
采用高温二次化料的方法制备了一种SiO2-Al2O3-ZnO-Na2O（F、Br）玻璃体系的光热敏折变（PTR）玻璃，通过紫外曝光、透射率光谱、X射线衍射(XRD)和差热分析等方法研究了其光热敏析晶机理。研究表明，PTR玻璃的光敏区为280～350 nm，工作区为 400～2700 nm，最佳成核温度和析晶温度分别为490 ℃和595 ℃，析晶组分为NaF晶体。采用双光束干涉方法与“两步法”的热处理工艺在PTR玻璃中制备了周期为1000 mm-1的布拉格体光栅，光栅的相对衍射效率达到91%，并验证了制备的布拉格体光栅具有角选择滤波能力。
Abstract
A photo-thermo-refractive (PTR) glass based on SiO2-Al2O3-ZnO-Na2O (F, Br) glass system is prepared with a two-step melting process. The crystallization mechanism of PTR glass is studied by the transmittance spectrum, X-ray diffraction (XRD) and differential scanning calorimetry. It is demonstrated that the photosensitive spectrum of PTR glass is from 280 to 350 nm, the working spectrum is from 400 to 2700 nm, the optimum nucleation temperature is above 490 ℃, the crystallization temperature is near 595 ℃ and the crystalline phase is NaF. Volume Bragg grating (VBG) with the spatial frequency of 1000 mm-1 is recorded in PTR glass with direct laser interference patterning and “two-step” heat treatment process. The prepared VBG has a relative diffractive efficiency up to 91% and the angular filtering ability.
熊宝星, 袁孝, 张翔, 封建胜, 张桂菊, 邹快盛. 光热敏折变玻璃及其布拉格体光栅特性研究[J]. 光学学报, 2012, 32(8): 0816001. Xiong Baoxing, Yuan Xiao, Zhang Xiang, Feng Jiansheng, Zhang Guiju, Zou Kuaisheng. Characteristics on the Photo-Thermal-Refractive Glass and Volume Bragg Gratings[J]. Acta Optica Sinica, 2012, 32(8): 0816001.
PDF全文
