Frequency response measurement of high-speed photodetectors using the spectrum power method in a delay self-heterodyne system |
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Authors: | Haisheng San Lin Li Gang Li Xuyuan Chen Boxue Feng |
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Institution: | (1) National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK;(2) Blackett Laboratory, Imperial College London, Prince Consort Road, London, SW7 2BW, UK |
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Abstract: | We report on a photoionization scheme for controlled loading of 88Sr+ ions into a radio-frequency (rf) ion trap. The two-step doubly-resonant process drives the 88Sr atom on the 5s2
1
S
0 – 5s5p1
P
1 transition at 461 nm using a frequency-doubled diode laser, and then excites the atom to the autoionizing (4d2+5p2) 1
D
2 state with 405 nm light from a free-running diode laser. This method of trap loading is quantitatively compared to electron
bombardment loading, and shown to reduce the Sr vapour pressure required to load by four orders of magnitude. It also provides
more than an order of magnitude reduction in the day-to-day variation of the voltages required to compensate micromotion.
We additionally introduce a two-step atomic source consisting of an oven and hotplate, which reduces the number of impurities
evaporated towards the trap. This is shown to significantly reduce fluctuations in required micromotion compensation voltages.
The demonstrated reduction in flux and increased source purity are expected to improve the reliability of trap operation for
precision ion-trap experiments.
PACS 32.80.Fb; 32.80.Pj; 39.10.+j |
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Keywords: | |
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