基于光热敏折变玻璃的反射式体布拉格光栅  

Reflective volume Bragg grating based on the photo-thermo-refractive glass

作　　者：蒋宇飞 赵士龙[1] 郭凌伟 叶仁广 华有杰[1] 张军杰[1] 陈亮 徐时清[1] JIANG Yu-fei;ZHAO Shi-long;GUO Ling-wei;YE Ren-guang;HUA You-jie;ZHANG Jun-jie;CHEN Liang;XU Shi-qing(Institute of Optoelectronic Materials and Devices,China Jiliang University,Hangzhou 310018,China;Collegeof Optical and Electronic Technology,China Jiliang University,Hangzhou 310018,China;Hangzhou QuantumMaterio Laser Co.,Ltd,Hangzhou 310018,China)

机构地区：[1]中国计量大学,光电材料与器件研究院,杭州310018 [2]中国计量大学,光学与电子科技学院,杭州310018 [3]杭州量材激光科技有限公司,杭州310018

出　　处：《光电子．激光》2020年第12期1341-1347,共7页Journal of Optoelectronics·Laser

基　　金：710071中国浙江省自然科学基金(编号LD18F050001和LZ20F050001);基本科研业务费专项资金;浙江省科学与浙江的科技创新人才Platformand计划的省属高校的支持资助项目。

摘　　要：为了稳定高功率半导体激光器的输出波长并且压缩其光谱带宽,通常采用反射式体布拉格光栅(VBG)作为反射镜来构造外腔半导体激光器。VBG是利用激光全息技术,在一种特殊的感光玻璃上制作的周期性调制折射率结构。采用传统的高温熔融-淬火工艺设计并制备了一种新型的光热敏折变(PTR)玻璃。测定了PTR玻璃的玻璃转变温度和软化温度。在400 nm波长以上,获得了高达91%的透过率。通过紫外全息曝光和两步热处理工艺成功实现了NaF纳米晶在PTR玻璃中的析出。在PTR玻璃上记录了布拉格波长为975.80 nm的反射式VBG,并将其用于高功率半导体激光器(LD)的波长锁定。利用衍射效率为13.97%的反射式VBG,可实现半导体激光器输出波长准确地锁定在975.80 nm。输出线宽被有效压缩到0.4 nm以下。在相同的水冷温度下,不同输入电流(2 A→10 A)实现了仅仅0.06 nm的红移。在输入功率为10.2 W时,单管LD的最大输出功率为9.7 W。In order to stabilize the wavelength and compress the spectral bandwidth of high power semiconductor lasers,the external cavity semiconductor lasers are usually constructed by using a reflective volume Bragg grating(VBG)as the reflecting mirror.VBG is a periodically modulated refractive index structure made in one direction of a special photosensitive glass by using laser holography technology.A novel photo-thermo-refractive(PTR)glass was designed and prepared by the traditional melt-quenching method.Glass transition temperature and the softening temperature of the PTR glass were determined.A high transmittance up to 91%was achieved above the wavelength of 400 nm.NaF nanocrystals were successfully precipitated from the PTR glass by the holographic exposure under UV radiation and two-step thermal treatment process.A reflective VBG at 975.80 nm was recorded in the PTR glass and was used for the wavelength locking of a high power semiconductor laser diode(LD).The output wavelength could be precisely locked at 975.80 nm using a reflective VBG with the diffraction efficiency of 13.97%.The output line-width was effectively compressed below 0.4 nm.Only 0.06 nm red shift was realized for different input currents(2 A→10 A)with the same water cooling temperature.The maximum output power is 9.7 W for the single tube LD with a power of 10.2 W.

关 键 词：光热敏折变玻璃 体布拉格光栅 半导体激光器 波长锁定 

分 类 号：TN365[电子电信—物理电子学]