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Chin. Phys. B, 2018, Vol. 27(9): 094201    DOI: 10.1088/1674-1056/27/9/094201

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

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.

Keywords:  two-frequency amplification      self-phase modulation      laser cooling      atom interferometry  
Received:  26 June 2018      Revised:  11 July 2018      Accepted manuscript online: 
PACS:  42.60.Lh (Efficiency, stability, gain, and other operational parameters)  
  42.65.-k (Nonlinear optics)  
  37.25.+k (Atom interferometry techniques)  

Project supported by the National Natural Science Foundation of China (Grant No. 61473166).

Corresponding Authors:  Yan-Ying Feng     E-mail:

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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