基于商用型空心阴极灯实现的法拉第反常色散原子滤光器  

Faraday Anomalous Dispersion Atomic Optical Filter Based on Commercial-Type Hollow Cathode Lamp

作　　者：缑芝玉 杨保东[1,2,3] 赵韩帅 周海涛 Gou Zhiyu;Yang Baodong;Zhao Hanshuai;Zhou Haitao(College of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,Shanxi,China;State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,Shanxi,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,Shanxi,China)

机构地区：[1]山西大学物理电子工程学院,山西太原030006 [2]山西大学量子光学与光量子器件国家重点实验室,光电研究所,山西太原030006 [3]山西大学极端光学协同创新中心,山西太原030006

出　　处：《光学学报》2023年第4期176-182,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61975102,11974226);国家重点研发计划(2017YFA0304502);山西省自然科学基金(20210302123437);山西省高等学校科技创新项目(2019L0101)。

摘　　要：基于铯原子6S_(1/2)-6P_(3/2)跃迁线,在商用型空心阴极灯中,实现了工作波长为852 nm的法拉第反常色散原子滤光器(FADOF):当铯空心阴极灯工作电流在1~4 mA范围内时,可获得单峰、共振的线芯式FADOF;当铯空心阴极灯工作电流在6~10 mA范围内时,可获得线翼式FADOF。实验上系统测量了工作电流、轴向磁场强度、信号光功率对FADOF性能的影响,优化参数下该滤光器的透射率高达77%。Objective Faraday anomalous dispersion optical filter(FADOF)has many advantages such as narrow bandwidth,high transmittance,and excellent background rejection,and it has been widely used in optical communication,radar remote sensing system,long-term frequency-stabilized laser system,and so on.In order to improve the transmittance of the optical filter,it is necessary to apply a certain intensity of magnetic field along the propagation direction of the signal light to rotate the polarization plane of the linearly polarized signal light according to the Faraday magneto-optic rotation effect.Besides,it is necessary to heat the temperature of the atomic vapor cell,so as to increase the number density of atoms,enhance the interaction between light and atoms,and thus improve the transmittance of a FADOF.However,for some atomic media with a high melting point,it is often inconvenient to heat the atomic vapor cell to a high enough temperature to obtain atomic samples with high number density.Some scholars have noticed that some light sources commonly used in atomic absorption spectrometers,such as hollow cathode lamps(HCLs)and electrodeless discharge vapor lamps,are excited by the collision between atoms.In the process of collision,the number density of the atomic samples in the lamp correspondingly increases.According to this point,we control the number density of atomic media in the lamp by adjusting the working current of the HCL and realize a FADOF with a wavelength of 852 nm based on the 6S_(1/2)-6P_(3/2) transition line of ^(133)Cs,and the wavelength is located in a transparent window of the atmosphere,which is helpful for free space laser communication.Methods Experimental setup for the FADOF system based on the commercial-type HCL is shown in Fig.2.The laser beam emitted from an external cavity diode laser(ECDL)at 852 nm with its frequency tuned to the 6S_(1/2)-6P_(3/2) transition line of ^(133)Cs first passes through an optical isolator(OI),and then is divided into two beams through a half-wave plate(HWP)and a p

关 键 词：光学器件 滤光器 磁致旋光 遥感 空心阴极灯 

分 类 号：O562[理学—原子与分子物理]