Collimation beam expander with balanced light intensity
A technology of collimation beam expansion and balance, which is applied in the field of collimation beam expanders, can solve problems such as insufficient light intensity balance accuracy of collimation beam expanders, and achieve the goals of improving light intensity balance accuracy, high adjustment sensitivity, and reducing the number of uses Effect
Active Publication Date: 2020-07-14
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology
[0005] The purpose of the present invention is to solve the shortcomings of the lack of light intensity balance accuracy of the existing collimator beam expander, improve the accuracy of the collimator beam expander and suppress the influence of external factors, so as to meet its use requirements in the field of cold atomic physics, and provide A Collimated Beam Expander with Balanced Light Intensity
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Embodiment 1
[0033] A collimated beam expander with balanced light intensity, including: two beam expanders facing each other and used in combination; the power measurement of the beam expander can be accurately corrected by adjusting the distance between the detector in the beam expander and the exit of the fiber The coefficient difference improves the light intensity balance accuracy of the beam expander unit; the light intensity balance accuracy is further improved through the synchronous differential measurement of the two detectors.
[0034] For the structure of the beam expander, please refer to figure 1, a structural diagram of the beam expander unit of a collimated beam expander with balanced light intensity. The first beam expander unit and the second beam expander unit face each other, and the output light propagation direction of the two is opposite, because the composition and structure of the two are the same, for the sake of simplicity, only the first beam expander unit is us...
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The invention relates to a collimation beam expander with balanced light intensity, and belongs to the field of cold atom physics. The beam expander comprises two beam expanding units which face eachother and are used in a combined mode. The power measurement coefficient difference of the beam expanding unit is accurately corrected by adjusting the distance between a detector in the beam expanding unit and an optical fiber outlet, and the light intensity balance precision of the collimation beam expander is improved. Common-mode noise such as laser power jitter and temperature drift is suppressed through a synchronous differential measurement scheme of the two detectors, and the light intensity balance precision of the collimation beam expander is further improved. The invention providesa collimation beam expander with accurate light intensity balance. The light intensity balance precision is 0.2%, the physical parameter measurement signal-to-noise ratio and measurement accuracy related to light intensity balance in the cold atom physical field are greatly improved; meanwhile the device has the advantages of being compact in structure, good in stability, convenient to use, high in adjustment sensitivity and the like.
Description
technical field [0001] The invention relates to a collimated beam expander with balanced light intensity, which belongs to the field of cold atomic physics. Background technique [0002] Thanks to the development of laser cooling and capture technology, the field of cold atom physics has become the fastest-growing and most brilliant direction. Cold atoms have a large de Broglie wave wavelength, low interatomic collision rate, and other states that can be finely manipulated. The advantages that the material (atoms at room temperature) do not have, have developed research fields such as quantum precision measurement, quantum computing, quantum simulation, and quantum information storage. etc. have extremely important applications. [0003] Using laser to prepare, manipulate and detect cold atoms runs through the beginning and end of cold atom physics experiments, among which, the light intensity balance of the laser beam has an extremely important influence. Taking the cold ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G02B6/26G02B6/27G02B6/32
CPCG02B6/264G02B6/272G02B6/2773G02B6/32
Inventor 白金海胡栋贡昊马慧娟王宇
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA