全固态单纵模273 nm深紫外激光器研制  

Development of All Solid State Single Longitudinal Mode 273 nm Deep-Ultraviolet Laser

作　　者：窦微 侯珊珊 郑志远 于博威 陈曦 郑权 Dou Wei;Hou Shanshan;Zheng Zhiyuan;Yu Bowei;Chen Xi;Zheng Quan(Changchun New Industries Optoelectronics Technology Co.,Ltd.,Changchun 130103,Jilin,China;Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,Jilin,China)

机构地区：[1]长春新产业光电技术有限公司,吉林长春130103 [2]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《中国激光》2023年第23期56-62,共7页Chinese Journal of Lasers

基　　金：吉林省重点研发计划(20230201062GX)。

摘　　要：设计了一种稳定的单纵模273 nm深紫外激光器。采用输出功率为3.5 W、π偏振方向的444 nm激光二极管(LD)与σ偏振方向的441 nm LD的偏振合光作为泵浦源,端面泵浦长度为7 mm的Pr^(3+)∶LiYF_(4)晶体,同时使用长度为5 mm的β-BaB_(2)O_(4)(BBO)晶体进行腔内倍频,利用法布里-珀罗(F-P)标准具进行单纵模的选取。当LD输出总功率为6240 mW时,可获得功率为32 mW的单纵模273 nm深紫外激光稳定输出。测量结果表明:光谱线宽小于80 fm,1 h均方根(RMS)功率稳定性优于1%。本研究方案在光生物学、半导体检测等领域具有较高的应用价值。Objective The features of deep-ultraviolet lasers are high single-photon energy,short wavelength,and easy absorption by materials.They are widely used in high-density optical data storage,high-resolution optical microscopy,material processing,spectral analysis,scientific research,and medical sterilization and diagnostic equipment.Currently,most deep-ultraviolet lasers are obtained by two or more nonlinear frequency conversions of near-infrared lasers;however,the efficiency of this method is generally low.In recent years,rare-earth ions(Pr^(3+))that can emit a visible laser directly at room temperature have attracted considerable attention.Its emission wavelengths span over the blue(485 nm),green(523 nm),orange(604 and 607 nm),and red(640,698,and 721 nm)regions.The appearance of Pr^(3+)also makes it possible to obtain a deep-ultraviolet laser through a single nonlinear frequency conversion.Polarized emission spectra of the Pr^(3+)∶LiYF_(4) crystal were measured at room temperature.In addition to the standard transition wavelengths,a weak fluorescence spectrum of the 3P0→3H5 transition was observed in the tested fluorescence lines at 546 nm.Recently,in our experimental group,we used a double-end-pumping Pr^(3+)∶LiYF_(4) crystal for frequency-doubling of the weak spectral line with aβ-BaB2O4(BBO)crystal and obtained a continuous deep-ultraviolet laser at 273 nm with a power of 128 mW.Compared to ordinary solid-state lasers,single-frequency lasers have the advantages of excellent stability,narrow spectral lines,and good coherence.This study added a mode selection element to explore the 273 nm deep-ultraviolet laser further.A single longitudinal mode deep-ultraviolet laser with a center wavelength of 272.93515 nm was successfully obtained,and the maximum output power was 32 mW.This study is essential for measuring the content of the antidepressant sertraline hydrochloride.Methods The absorption properties of polarized Pr^(3+)∶LiYF_(4) crystals were studied.The absorption efficiency of the Pr^(3+)∶LiYF_(4) c

关 键 词：激光器 深紫外激光器 单纵模 Pr^(3+)∶LiYF_(4)晶体 法布里-珀罗标准具 

分 类 号：TN248.1[电子电信—物理电子学]