Rb原子420nm超窄线宽原子滤光器的系统分析及实验研究
发布时间：2018-08-06 19:18
【摘要】：对于半导体激光器,评估其性能的重要指标有两个:线宽和频率稳定性。由于激光器在自由运转时将产生频率的漂移和起伏,所以通常将激光器的中心频率锁定在一条稳定度很高的谱线上,例如通过光反馈或电反馈将半导体激光器频率锁定在原子或分子跃迁光谱线上以达到压窄线宽和稳频。因此,用窄线宽光谱为稳频提供一个频率参考十分必要。420nm波长精密光谱及原子滤光器是光反馈的典型应用。相比于传统的干涉滤波器,法拉第反常色散原子滤光器(FADOF)具有高的背景抑制,机械强度大,高的成像能力和高的透过率。超窄线宽光学滤波器是激光雷达,天文观测,自由空间通信以及量子光学的重要元件。本课题从理论和实验两方面介绍同位素85Rb 420nm波段的多普勒吸收谱、饱和吸收光谱、极化谱、超窄线宽原子滤光谱。利用法拉第效应、圆二色性和饱和吸收技术来实现超窄线宽原子滤光器。讨论了不同温度、磁场、泵浦光功率对于超窄线宽原子滤光器透过率的影响,并解释了产生该影响的原因。结果显示,在泵浦光功率、探测光功率、铷泡加热温度、磁场强度分别为4.5mW、0.45mW、120℃、5Gs时获得最大单峰透射,透过率为2.1%,线宽为6.7MHz,对应于5S1/2,F=3→6P3/2,F'=3,4(交叉峰)跃迁。实验系统获得滤光谱的线宽接近自然线宽,至少比传统法拉第反常色散原子滤波器小两个数量级。同时对影响滤光器线宽的主要因素——系统噪声的来源进行定性地分析。
[Abstract]:For semiconductor lasers, there are two important parameters to evaluate their performance: linewidth and frequency stability. Because of the frequency drift and fluctuation of the laser when it operates freely, the central frequency of the laser is usually locked on a very stable spectral line. For example, the semiconductor laser frequency is locked on the atomic or molecular transition spectral lines through optical or electrical feedback to achieve narrow linewidth and frequency stabilization. Therefore, it is necessary to use narrow linewidth spectrum to provide a frequency reference for frequency stabilization. The precise wavelength spectrum of .420 nm and atomic filter are typical applications of optical feedback. Compared with the traditional interference filter, Faraday anomalous dispersion atomic filter (FADOF) has high background suppression, high mechanical strength, high imaging ability and high transmittance. Ultra-narrow linewidth optical filters are important components of lidar, astronomical observation, free space communication and quantum optics. In this paper, the Doppler absorption spectrum, saturated absorption spectrum, polarization spectrum and ultra-narrow linewidth atomic filter spectrum of isotope 85Rb 420nm band are introduced theoretically and experimentally. Faraday effect, circular dichroism and saturated absorption technique are used to realize the ultra-narrow linewidth atomic filter. The effects of temperature, magnetic field and pump power on the transmittance of the ultra-narrow linewidth atomic filter are discussed, and the reasons for the influence are explained. The results show that the maximum single peak transmission is obtained when the pump power, detection power, rubidium bubble heating temperature and magnetic field intensity are 4.5mWN 0.45mWN 120 鈩，
本文编号：2168732
[Abstract]:For semiconductor lasers, there are two important parameters to evaluate their performance: linewidth and frequency stability. Because of the frequency drift and fluctuation of the laser when it operates freely, the central frequency of the laser is usually locked on a very stable spectral line. For example, the semiconductor laser frequency is locked on the atomic or molecular transition spectral lines through optical or electrical feedback to achieve narrow linewidth and frequency stabilization. Therefore, it is necessary to use narrow linewidth spectrum to provide a frequency reference for frequency stabilization. The precise wavelength spectrum of .420 nm and atomic filter are typical applications of optical feedback. Compared with the traditional interference filter, Faraday anomalous dispersion atomic filter (FADOF) has high background suppression, high mechanical strength, high imaging ability and high transmittance. Ultra-narrow linewidth optical filters are important components of lidar, astronomical observation, free space communication and quantum optics. In this paper, the Doppler absorption spectrum, saturated absorption spectrum, polarization spectrum and ultra-narrow linewidth atomic filter spectrum of isotope 85Rb 420nm band are introduced theoretically and experimentally. Faraday effect, circular dichroism and saturated absorption technique are used to realize the ultra-narrow linewidth atomic filter. The effects of temperature, magnetic field and pump power on the transmittance of the ultra-narrow linewidth atomic filter are discussed, and the reasons for the influence are explained. The results show that the maximum single peak transmission is obtained when the pump power, detection power, rubidium bubble heating temperature and magnetic field intensity are 4.5mWN 0.45mWN 120 鈩，
本文编号：2168732
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