| Original Articles |
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Temperature Dependence of Dark Lines in Coherent Population Trapping |
| DENG Jian-Liao;HU Zheng-Feng;HE Hui-Juan;WANG Yu-Zhu |
| Key Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 |
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| Cite this article: |
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DENG Jian-Liao, HU Zheng-Feng, HE Hui-Juan et al 2006 Chin. Phys. Lett. 23 1745-1748 |
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Abstract We measure the signal amplitude and linewidth of a dark line in coherent population trapping in the Rb vapour cell filled with mixed buffer gas N2 and Ar as a function of cell temperature. We find that the dark line signal amplitude increases with temperature up to a maximum at 49°C and then drops at higher temperatures due to quenching effects of N2. The linewidth of the dark line remains basically constant, at 1080Hz. We also measure the linewidth of the dark line as a function of laser intensity. The linewidth increases linearly with laser intensity. An intrinsic linewidth (FWHM=896Hz at 3.4GHz) of the Rb cell is obtained.
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| Keywords:
32.50.+d
32.70.Jz
42.50.Gy
42.62.Eh
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Published: 01 July 2006
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| PACS: |
32.50.+d
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(Fluorescence, phosphorescence (including quenching))
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32.70.Jz
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(Line shapes, widths, and shifts)
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42.50.Gy
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(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
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42.62.Eh
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(Metrological applications; optical frequency synthesizers for precision spectroscopy)
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