铀原子光谱研究

主要介绍研究铀原子双频、三频共振电离的实验和部分实验结果，为激光分离同位素提供光谱数据。     

铀空心阴极放电中的光电流光谱

利用连续可调谐染料激光器和自制Kr-U空心阴极放电灯,在562～615nm波长范围内测得了共81条铀的光电流光谱线。     

用脉冲激光饱和荧光法测定铀原子光吸收截面

本文介绍了用脉冲激光饱和荧光法，来测定铀的０－１６９００ｃｍ＾－１能级的吸收截面，讲述了测量光吸收截面的基本原理，实验测量过程，并用此方法测量铀原子光吸收截面和国外文献发表相吻合。     

铀酰溶液中铀含量的激光诱导击穿光谱测量

为了快速定量地分析待测样品中铀元素含量信息,采用激光诱导击穿光谱技术结合内标法,通过脉宽为7ns、输出能量为20mJ的纳秒激光脉冲诱导涂有硝酸双氧铀的石墨片产生等离子体光谱,测量了波长范围为300nm～800nm的光谱数据,对涂有不同浓度的铀样品进行了定量分析以及理论分析和实验验证,取得了UⅡ409.01nm和UⅡ36...     

半导体制冷横向塞曼稳频激光干涉测量系统

介绍了横向塞曼效应He-Ne激光器的磁场设定、信号获取、利用半导体制冷(TEC)的主从控制稳定频率的技术。阐述了由程控倍频模块和双通道缓冲连续计数模块组成的电子细分电路,实现可用按键设定2、4、8、16四种计数脉冲细分系数,以获取不同干涉测量分辨力。实验得出了横向塞曼稳频激光器的频率稳定度为1.74×10-9,稳频时激光管温度为43℃,克服了加热稳频法激光管温度过高、不易散热以及风扇风冷法激光频率短期稳定度低的缺点。系统具有0.16、0.08、0.04、0.02μm四种测量分辨力。     

某些双原子氟化物分子激光发射谱的近似计算

本文给出了双原子氟化物分子激光发射谱的经验公式,并作了验证,也估算了其它几种介质可能的激光发射谱分别为98.07nm/HeF,118.29nm/NeF,457.44nm/RnF,和683.99nm/AtF。     

氖原子弱光电流谱线的观测

应用光电流光谱技术,在空心阴极放电管中首次观测到氖原子的2P_7→4d_5、2P_1→4S_2 和2P_6→4d_J"跃迁产生的三条弱谱线.     

在300nm波段OCS分子的多光子电离谱

本文首次测定了ＯＣＳ分子在２９９￣３０２ｎｍ波段的多光子电离谱。这一段的谱线被归属为Ｄ＾１Σ＾＋←Ｘ＾１Σ＾＋的跃迁。通过激光功率和离子信号强度的关系，认为ＯＣＳ分子多光子电离经历了（２＋１）三光子电离的过程。此外，还考察了ＯＣＳ的压力对离子信号强度的影响，并对此进行了讨论。     

铀原子高激发态寿命测量

本文报道用三波长三步光电离法测量铀原子高激发态奇能级寿命的技术和结果。     

Passive Fraunhofer-wavelength atomic filter at 460.7 nm

A passive Fraunhofer-wavelength atomic filter in the spectral region of minimum seawater attenuation is reported. Signal light at 460.7 nm is strongly absorbed by strontium atoms contained in a heated vapor cell. Collisions with rare gases transfer population into the Sr(5 p³P_j) level, which subsequently emits 689.3-nm photons. Up to 45% photon conversion efficiency was recorded. The strontium filter exhibits a 50-μs decay time and a single noise passband     

A Fraunhofer-wavelength magnetooptic atomic filter at 422.7 nm

A demonstration of the first magnetooptic atomic filter that overlays a strong solar Fraunhofer line is reported. Compared with alkali magnetooptic filters, this filter enjoys a large reduction in solar interference and a significant decrease in the number of noise passbands. The filter utilizes the strong Ca(4p¹P₁-4s¹ S₀) transition at 422.7 nm. Under the weak magnetic field experimental conditions, a maximum transmission efficiency of 55% and a symmetrical double-peaked transmission spectrum with 1.5 GHz wide passbands were observed. The filter's frequency response was measured with a laser intensity modulation technique. No falloff was observed at 176 MHz, the highest frequency available with the apparatus. Calculations indicate that further improvements in filter performance can be achieved by optimizing the magnetic field and the cell temperature     

Zeeman splitting of excited boron states in p-Ge

The photothermal spectrum of shallow acceptors in p-Ge has been investigated at various magnetic field strengths up to 5.6 T at a temperature of 7.5 K by FIR-Fourier-spectroscopy. From the observed Zeeman splittings of the excited states of the boron acceptor the coefficients of the linear and quadratic field dependence have been evaluated andg-factors of theD-,C- and theG-transitions have been determined based on a standard group theoretical approach.     

Experiment on 1500 nm stabilised Zeeman laser

The 1500 nm stabilised He-Ne transverse Zeeman laser (STZL) equipment is now well established, and the laser used in this equipment is specially fabricated to give a goodquality Zeeman beat frequency curve. The measurement of IF fluctuation given by two such STZLs beating with each other shows that the frequency stability of these lasers is about ±1.25 MHz for a long running time. The equipment is not complex and is suitable for coherent optical fibre communication systems.     

Lasing on the lithium resonance line at 670.7 nm

Stimulated emission is observed on the 2p²P1/2,3/2→ 2s²S1/2resonance transition of Li at 670.7 nm when lithium iodide (LiI) is photodissociated with the output from an ArF laser (lambda = 193nm). Minimizing sodium iodide (NaI) as an impurity is crucial and the laser lifetime (several hours) appears to be limited by reaction of LiI with the walls of the quartz cell.     

激光激发的铀原子荧光光谱

以直流空心阴极灯作蒸气源,以若丹明6G染料激光作激发光源,简单方便地观测到铀原子的753.393、763.175和763.954nm荧光辐射。对消除以灯辐射为主的强背景作了详细讨论。     

Frequency tuning of a CW atomic iodine laser via the Zeeman effect

A continuously operating, C₃F₇I photolytic 1.315-μm atomic iodine laser has been used to make the first precise observations of frequency tuning of an atomic iodine laser by means of the Zeeman effect. Application of a uniform magnetic field to the gain region of the photolytic iodine laser causes the laser to operate at different frequencies as a function of the strength of the applied field and the polarization of the laser. With the light polarized perpendicular to the applied magnetic field by means of Brewster output windows, the laser could be tuned to frequencies near the 3-4, 2-2, and 3-3 zero-field transitions of the hyperfine spectrum of atomic iodine. With the light polarized parallel to the applied magnetic field the laser could be tuned to two frequencies bracketing the 3-4 zero-field transition and one frequency near the 2-2 transition. Measurements show close agreement between the observed frequency behavior and theoretical models     

溯源于低温辐射计的1064nm波段探测器绝对光谱响应度定标

标准传递探测器在红外波段的绝对光谱响应度定标不确定度较大且难以降低,其主要影响因子是窗口透过率的测量不确定度,该项因子是由布儒斯特窗口的状态复现引入。给出了陷阱型标准传递探测器在1 064 nm波段溯源于低温绝对辐射计的定标实验过程和结果。介绍了低温辐射计新型Y型定标光路,该光路消除了低温辐射计窗口反射损耗引入的不确定性。实验测试了探测器在1 064 nm波段的线性、空间响应均匀性、稳定性和空间偏振非敏感性。结果表明:传递探测器绝对光谱响应度定标的不确定度优于0.023%,响应度重复性的实验结果表明了Y型低温辐射计定标光路改造的可行性。     

Wollaston棱镜分束角的光谱特性

提要:为了了解Wollaston棱镜分束角随入射光波长的变化规律,我们对其分束角的光谱特性从理论上进行了分析,并进行了实验测试,结果表明:入射光波长对Wollaston棱镜的分束角有一定的影响,其规律为:棱镜的结构角越大,入射光波长对分束角的影响越大:紫外光谱区的影响大于可见和红外光谱区。对于Wollaston棱镜分束角的对称性,其特点为:棱镜结构角越大,入射光波长越短,对称性越差。