atom n. 1.原子。 2.微粒;微量。 chemical atoms 原子。 physical atoms 分子。 have [there is] not an atom of 一點(diǎn)也沒(méi)有。 break to atoms 粉碎 (The vase was broken to atoms. 花瓶敲得粉碎)。
The detuning of the trapping laser is 120ghz and laser power near the focus is about 300m w . the dipole trap is characterized via the fluorescence of trapped cesium atoms 俘獲光相摘要對(duì)艷原子dz線負(fù)失諧120ghz ,俘獲光功率約300mw ,聚焦腰斑半徑約巧腳。
The system has its own style . the trapping beams can be independently adjustable and three double - passed circularly polarized cooling / trapping beams intersect at the center of mot . about 1 107 cesium atoms with equivalent temperature of ~ 270 k are successfully trapped in our vcmot 在每束冷卻俘獲光的光強(qiáng)約4 . 9mw cm ~ 2 、失諧量為- 10mhz 、軸向磁場(chǎng)梯度約11 . 6gauss cm的條件下得到的冷原子樣品中典型的原子數(shù)約1 10 ~ 7個(gè),溫度約270 k左右。
Usually the magneto - optical trap is used to obtain the cold atoms from the vapor . it is reported that experiments for obtaining the ultra - cold cesium atoms by optical molasses directly from the vapor cell without mot . the lowest temperature achieved for the cesium atomic cloud was 3k . the relationship between the temperature and the detuning of cooling laser was measured 報(bào)告了采用直接從銫蒸汽氣室而不用磁光阱實(shí)現(xiàn)了光學(xué)粘團(tuán)的方法。用此辦法得到了3的銫的超冷原子團(tuán)。這是我國(guó)目前用激光冷卻方法得到的最低溫度。
In the field of fundamental research , such as quantum optics , blue light can be used as a pump source of optical parametric oscillator ( opo ) to generate the neoclassical light fields around wavelength of 860nm , which can be detected with 99 . 9 % of quantum efficiency , the highest efficiency in the measurement of neoclassical light as known yet it is also possible to generate the squeezed vacuum state at 852nm , which is the resonance wavelength of the transition line d2 of cesium atoms and can be supposed to investigate the properties of atomic radiation in the interaction between atoms and quantum state of light fields 在量子光學(xué)中,該藍(lán)光作為下轉(zhuǎn)換的泵浦源,可以產(chǎn)生860nm非經(jīng)典光場(chǎng),其探測(cè)效率可達(dá)99 . 9 ,高于目前產(chǎn)生的其他任何波段的非經(jīng)典光場(chǎng)。同時(shí)通過(guò)溫度調(diào)諧,可望產(chǎn)生與銫原子d2線作用的852nm波段的壓縮真空態(tài),從而開(kāi)展非經(jīng)典光場(chǎng)與冷原子的相互作用等方面的實(shí)驗(yàn)研究。本文主要通過(guò)knbo _ 3晶體外腔諧振倍頻技術(shù)來(lái)產(chǎn)生藍(lán)色激光光源。