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Photon counts modulation in optical time domain reflectometry

ISSN号：1674-1056
期刊名称：《中国物理B：英文版》
时间：0
分类：O561.3[理学—原子与分子物理;理学—物理] TM935.2[电气工程—电力电子与电力传动]
作者机构：[1]State Key Laboratory of Quantum Optics and Quantum Optics Devices, Laser Spectroscopy Laboratory, College of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China
相关基金：Project supported by the National Basic Research Program of China （Grant No. 2012CB921603）, the National High Technology Research and Development of China （Grant No. 2009AA01Z319）, the National Natural Science Foundation of China （Grant Nos. 61008012, 10934004, 60978018, 60978001, 60808009, and 11074154）, the Science Fund for Creative Research Groups of the National Natural Science Foundation of China （Grant No. 60821004）, the Specialized Research Fund for the Doctoral Program of Higher Education of China （Grant No. 20101401120004）, and the National Natural Science Foundation of Shanxi Province, China （Grant No. 2009011059-2）.

作者：王晓波[1], 王晶晶[1], 张国锋[1], 肖连团[1], 贾锁堂[1]

关键词：分子光谱, 精确测量, 移频器, 宽度, 缔合, 超冷分子, 激光强度, 激光光束, laser cooling, molecular spectroscopy, line shapes and width

中文摘要：

We propose a technique to precisely measure the line width of the photoassociation spectra of the excited cesium molecule by using a frequency shifter to generate two laser beams with a precise frequency difference. A series of photoassociation (PA) spectra are recorded with two laser beam induced molecular lines, whose peak separation serves as an accurate frequency ruler to measure the line width of the PA spectra. The full width half maximum line width was studied as a function of PA laser intensity. The extrapolated value at zero laser intensity is (34.84 ± 0.22) MHz. By analyzing other broadening mechanisms, a value of (32.02 ± 0.70) MHz was deduced. It is shown that this scheme is inexpensive, simple, robust, and is promising for applications in a variety of other atomic species.

英文摘要：

We propose a technique to precisely measure the line width of the photoassociation spectra of the excited cesium molecule by using a frequency shifter to generate two laser beams with a precise frequency difference. A series of photoassociation （PA） spectra are recorded with two laser beam induced molecular lines, whose peak separation serves as an accurate frequency ruler to measure the line width of the PA spectra. The full width half maximum line width was studied as a function of PA laser intensity. The extrapolated value at zero laser intensity is （34.8± 0.22） MHz. By analyzing other broadening mechanisms, a value of （32.02 ± 0.70） MHz was deduced. It is shown that this scheme is inexpensive, simple, robust, and is promising for applications in a variety of other atomic species.

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