| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Two-frequency amplification in a semiconductor tapered amplifier for cold atom experiments |
| Zhi-Xin Meng(孟至欣), Yu-Hang Li(李宇航), Yan-Ying Feng(冯焱颖) |
| State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China |
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Abstract Simultaneous two-frequency amplification is highly desirable in cold atom experiments. The nonlinear response would appear in the two-frequency amplification with a semiconductor tapered amplifier (TA) and has a direct influence on the experimental result. We investigated in detail the effects of frequency difference, total power, and power ratio of two seeding lasers on the output components based on a simplified theoretical model. The simulation results showed that the multiple sideband generation in the amplifier due to self-phase and amplitude modulation could be suppressed and the TA tended to linearly amplify the power ratio between two-frequency components, when the two seeding lasers had a large frequency difference. This was verified experimentally in the output power ratio measurement via a calibrated Fabry-Perot interferometer method with a good linearity and an uncertainty of 1%. We also discussed the consequences of power ratio responses in the amplification in light of cold atom experiments, especially in the ac Stark shift related phase error of Raman-type atom interferometers (AIs). It was shown that the fluctuation of intensity ratio of Raman beams may induce significant systematic errors for an AI gyroscope.
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Received: 26 June 2018
Revised: 11 July 2018
Accepted manuscript online:
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PACS:
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42.60.Lh
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(Efficiency, stability, gain, and other operational parameters)
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42.65.-k
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(Nonlinear optics)
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37.25.+k
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(Atom interferometry techniques)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61473166). |
Corresponding Authors:
Yan-Ying Feng
E-mail: yyfeng@tsinghua.edu.cn
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Cite this article:
Zhi-Xin Meng(孟至欣), Yu-Hang Li(李宇航), Yan-Ying Feng(冯焱颖) Two-frequency amplification in a semiconductor tapered amplifier for cold atom experiments 2018 Chin. Phys. B 27 094201
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