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d2:spectroscopy_module [2013/08/13 20:47] – All figures now in manual Ben Luey | d2:spectroscopy_module [2021/08/26 15:26] (current) – external edit 127.0.0.1 |
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</WRAP> | </WRAP> |
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======Spectroscopy Module ====== | ======Spectroscopy Module (Obsolete) ====== |
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Model No. D2-110 | Model No. D2-110 |
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=====Description===== | =====Description===== |
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| //**Replaced by [[d2:spectroscopy_module_210|D2-210 Spectroscopy Module]]**// |
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The spectroscopy module provides saturated absorption spectroscopy to atomic rubidium. It contains a rubidium absorption cell, TEC, balanced photodetector, and associated mirrors and beamsplitting optics. Nominally, it takes two 1% samples from the input beam. Temperature control stabilizes the number density of atoms in the cell, and a balanced photodetection circuit compensates for intensity drifts giving stable control over the lock point for side locking applications. Two beamsteering adjustments are provided for optimizing overlap of the counter-propagating beams, and positioning on the signal photodiode. The photodiode output is shot-noise limited out to ~12 MHz for photocurrents of 50 A and above. The high bandwidth of the feedback enables tight solid locking that is immune to vibrations and shock. | The spectroscopy module provides saturated absorption spectroscopy to atomic rubidium. It contains a rubidium absorption cell, TEC, balanced photodetector, and associated mirrors and beamsplitting optics. Nominally, it takes two 1% samples from the input beam. Temperature control stabilizes the number density of atoms in the cell, and a balanced photodetection circuit compensates for intensity drifts giving stable control over the lock point for side locking applications. Two beamsteering adjustments are provided for optimizing overlap of the counter-propagating beams, and positioning on the signal photodiode. The photodiode output is shot-noise limited out to ~12 MHz for photocurrents of 50 A and above. The high bandwidth of the feedback enables tight solid locking that is immune to vibrations and shock. |