Rb原子420nm超窄線寬原子濾光器的系統(tǒng)分析及實驗研究
發(fā)布時間：2018-08-06 19:18
【摘要】：對于半導體激光器,評估其性能的重要指標有兩個:線寬和頻率穩(wěn)定性。由于激光器在自由運轉時將產生頻率的漂移和起伏,所以通常將激光器的中心頻率鎖定在一條穩(wěn)定度很高的譜線上,例如通過光反饋或電反饋將半導體激光器頻率鎖定在原子或分子躍遷光譜線上以達到壓窄線寬和穩(wěn)頻。因此,用窄線寬光譜為穩(wěn)頻提供一個頻率參考十分必要。420nm波長精密光譜及原子濾光器是光反饋的典型應用。相比于傳統(tǒng)的干涉濾波器,法拉第反常色散原子濾光器(FADOF)具有高的背景抑制,機械強度大,高的成像能力和高的透過率。超窄線寬光學濾波器是激光雷達,天文觀測,自由空間通信以及量子光學的重要元件。本課題從理論和實驗兩方面介紹同位素85Rb 420nm波段的多普勒吸收譜、飽和吸收光譜、極化譜、超窄線寬原子濾光譜。利用法拉第效應、圓二色性和飽和吸收技術來實現超窄線寬原子濾光器。討論了不同溫度、磁場、泵浦光功率對于超窄線寬原子濾光器透過率的影響,并解釋了產生該影響的原因。結果顯示,在泵浦光功率、探測光功率、銣泡加熱溫度、磁場強度分別為4.5mW、0.45mW、120℃、5Gs時獲得最大單峰透射,透過率為2.1%,線寬為6.7MHz,對應于5S1/2,F=3→6P3/2,F'=3,4(交叉峰)躍遷。實驗系統(tǒng)獲得濾光譜的線寬接近自然線寬,至少比傳統(tǒng)法拉第反常色散原子濾波器小兩個數量級。同時對影響濾光器線寬的主要因素——系統(tǒng)噪聲的來源進行定性地分析。
[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，
本文編號：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，
本文編號：2168732
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