本文選題：原子冷卻 + 光晶格��； 參考：《中國(guó)科學(xué):物理學(xué) 力學(xué) 天文學(xué)》2017年06期

【摘要】：激光冷卻原子是超冷原子分子物理實(shí)驗(yàn)的基礎(chǔ),在精密測(cè)量、量子模擬等研究中具有重要的意義.為了獲得溫度更低,密度更高的超冷銫原子樣品作為制備超冷基態(tài)銫分子的起點(diǎn),本文實(shí)驗(yàn)展示了一種利用三維光晶格裝載實(shí)現(xiàn)超冷銫原子溫度進(jìn)一步降低的方法,有效克服了磁光阱中超冷原子輻射光子自吸收引起的加熱問題.在標(biāo)準(zhǔn)的磁光阱系統(tǒng)中獲得超冷銫原子的基礎(chǔ)上,利用壓縮磁光阱技術(shù)提高超冷銫原子的密度.通過四束激光構(gòu)建三維光晶格,實(shí)現(xiàn)超冷銫原子的高效裝載,采用飛行時(shí)間法測(cè)量了原子的溫度,觀察到溫度由~6 0.0μK降低至~1 1.6μK的冷卻結(jié)果.同時(shí)研究了光晶格激光的頻率與原子裝載數(shù)目的關(guān)系,發(fā)現(xiàn)在負(fù)失諧1 5.5GHz時(shí)光晶格裝載效率最高.同時(shí),本文研究了利用光晶格減小超冷原子輻射光子自吸收引起的加熱問題,對(duì)于進(jìn)一步降低銫原子溫度的研究具有深遠(yuǎn)的意義.
[Abstract]:Laser cooling of atoms is the basis of ultracold atomic and molecular physics experiments, which is of great significance in the research of precision measurement and quantum simulation. In order to obtain lower temperature and higher density samples of ultra-cooled cesium atoms as the starting point for preparing ultra-cold ground state cesium molecules, a method of further lowering the temperature of ultra-cooled cesium atoms by using three-dimensional optical lattice loading has been demonstrated in this paper. It effectively overcomes the heating problem caused by photon self-absorption caused by ultra-cold atomic radiation in magneto-optical trap. On the basis of obtaining supercooled cesium atoms in a standard magneto-optical trap system, the density of supercooled cesium atoms is improved by using compressed magneto-optical trap technique. Three-dimensional optical lattice was constructed by four beams of laser to realize the high efficiency loading of cesium atoms. The temperature of the atoms was measured by time-of-flight method. The cooling results were observed when the temperature was reduced from 60.0 渭 K to 11.6 渭 K. At the same time, the relationship between the frequency of optical lattice laser and the number of atom loading is studied. It is found that the lattice loading efficiency is the highest in negative detuning 1 5.5GHz. At the same time, the heating problem caused by using optical lattice to reduce the radiation photon self-absorption of supercooled atoms is studied, which is of great significance to further reduce the temperature of cesium atoms.
【作者單位】： 山西大學(xué)物理電子工程學(xué)院激光光譜研究所量子光學(xué)與光量子器件國(guó)家重點(diǎn)實(shí)驗(yàn)室;晉城職業(yè)技術(shù)學(xué)院機(jī)械電子工程系;山西大學(xué)極端光學(xué)協(xié)同創(chuàng)新中心;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(編號(hào):2012CB921603) 教育部長(zhǎng)江學(xué)者和創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃(編號(hào):IRT13076) 國(guó)家自然科學(xué)基金重大研究計(jì)劃培育項(xiàng)目(編號(hào):91436108);國(guó)家自然科學(xué)基金(編號(hào):61378014,61308023,61378015,11434007) 教育部新教師基金(編號(hào):20131401120012)資助
【分類號(hào)】：O562

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本文編號(hào)：1975920