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  本文關(guān)鍵詞：相干布居囚禁原子鐘和磁強(qiáng)計(jì)的差分探測研究　出處：《中國科學(xué)院研究生院(武漢物理與數(shù)學(xué)研究所)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 相干布居囚禁 原子鐘 原子磁強(qiáng)計(jì) 旋光效應(yīng)

【摘要】：相干布居囚禁(Coherent Population Trapping,CPT)是一種量子干涉效應(yīng),在原子鐘和原子磁強(qiáng)計(jì)的研制中有著重要應(yīng)用。本文針對提高CPT原子鐘的短期穩(wěn)定度和CPT磁強(qiáng)計(jì)的靈敏度分別進(jìn)行了實(shí)驗(yàn)研究。以下是本文的研究成果：1、將以左、右旋光為光源的方案(σ+σ+-σ-σ-)應(yīng)用于芯片原子鐘(Chip Scale Atomic Clock,CSAC)所用的微型原子氣泡,研究了該方案在CSAC研制中的應(yīng)用潛力。該方案提高了原子利用率,與傳統(tǒng)方案相比所獲CPT信號對比度改善3倍。2、對垂直線偏振方案(lin⊥lin)所用的正交偏振儀進(jìn)行了改進(jìn)。改進(jìn)后的正交偏振儀體積減小,且提高了系統(tǒng)的機(jī)械穩(wěn)定性,有望將其應(yīng)用于CSAC的研制,來提高CSAC的短期穩(wěn)定度。3、對己提出的平行線偏振方案(lin‖lin)做了進(jìn)一步研究,探討了該方案在提高CPT原子鐘穩(wěn)定度方面的可行性和應(yīng)用潛力。研究結(jié)果揭示：雖然該方案可以提高CPT信號的對比度,但由于該方案需要將激光頻率鎖定在87Rb原子D1線激發(fā)態(tài)的Fe=1的吸收譜線上,而該譜線較小,因此當(dāng)CPT信號幅度太大時(shí)將難以進(jìn)行激光鎖頻,且CPT信號的噪聲會明顯增大。4、研究了偏振相互垂直的兩束線偏振光與87Rb原子相互作用后,同時(shí)存在干涉效應(yīng)和旋光效應(yīng)的CPT譜線。實(shí)驗(yàn)中采用前面改進(jìn)后的正交偏振儀得到了偏振方向相互垂直的多色線偏振光,通過改變一束光的光程而改變兩光束的光程差,將光程差定在最佳值處,差分探測得到了高信噪比的CPT吸收譜線和色散譜線。利用該方案具有將CPT原子鐘的短期穩(wěn)定度提高3倍以上的潛力。5、提出了基于差分探測磁旋光信號的CPT磁強(qiáng)計(jì)方案(DMOR-CPT磁強(qiáng)計(jì))。DMOR-CPT磁強(qiáng)計(jì)方案采用線偏振光,并用差分探測技術(shù)探測線偏振光與原子作用后的磁旋光信號。該方案可將靈敏度提高半個(gè)量級,同時(shí)其弱磁場探測能力也提高了一倍,而且其裝置簡單,有望實(shí)現(xiàn)小型CPT磁強(qiáng)計(jì)。
[Abstract]:Coherent population trapping (Population) is a quantum interference effect. It has important applications in the development of atomic clock and atomic magnetometer. In this paper, the short-term stability of CPT atomic clock and the sensitivity of CPT magnetometer are studied experimentally. :. 1. The scheme (蟽-蟽-蟽-蟽-蟽-蟽 -) with left and right turn light as light source is applied to chip Scale Atomic Clock. The application potential of this scheme in the development of CSAC has been studied, and the atomic utilization rate has been improved by using the micro atomic bubble used in CSAC. Compared with the traditional scheme, the contrast of the CPT signal obtained is improved by 3 times. 2. The orthogonal polarimeter used in the vertical line polarization scheme is improved. The volume of the improved orthogonal polarimeter is reduced. The mechanical stability of the system is improved, which is expected to be applied to the development of CSAC to improve the short-term stability of CSAC. 3. The parallel line polarization scheme proposed by us is further studied. The feasibility and application potential of this scheme in improving the stability of CPT atomic clock are discussed. The results show that the scheme can improve the contrast of CPT signals. However, the scheme needs to lock the laser frequency on the absorption line of Fe=1 in the excited state of 87Rb D1 line, which is small, so it will be difficult to lock the laser frequency when the amplitude of CPT signal is too large. The noise of CPT signal will increase obviously. 4. The interaction of two beam line polarized beams with 87Rb atom is studied. At the same time, there are interference effect and optical rotation effect in CPT spectra. In the experiment, the polarization direction is perpendicular to each other by using the improved orthogonal polarimeter. By changing the optical path of a beam of light and changing the optical path difference of two beams, the optical path difference is determined at the optimum value. The CPT absorption and dispersive spectral lines with high SNR are obtained by differential detection. The proposed scheme has the potential of increasing the short-term stability of CPT atomic clock by more than 3 times. A scheme of CPT magnetometer based on differential detection of magnetic rotation signal is presented. The scheme of DMOR-CPT magnetometer adopts linear polarization. The differential detection technique is used to detect the magneto-optical signal after the interaction between the linear polarized light and the atom. This scheme can increase the sensitivity by half an order of magnitude, at the same time, the detection ability of the weak magnetic field is doubled, and the device is simple. It is expected to realize a small CPT magnetometer.
【學(xué)位授予單位】：中國科學(xué)院研究生院(武漢物理與數(shù)學(xué)研究所)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TM935.115

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本文編號：1381770