Abstract
This chapter discusses an optically pumped mid infrared ammonia laser for probing the fine structure transition of a laser cooled single barium ion held in a radio frequency trap. The 2 D 5/2 ← 2 D 3/2 magnetic dipole transition of 138 Ba + lies at 800.974 cm -1 . There exist several P-branch transitions of the ν 2 -band of 15 NH 3 in close proximity to the Ba + clock transition but none of them have been previously observed in laser emission. The chapter describes the laser action on the sP (8, 7) line of 15 NH 3 at 800.95593 cm -1 and on the sP (8, 6) line at 801.52895 cm -1 . The probe power saturation requirements for Ba + are estimated to be a few nanowatts, provided the linewidth of the probe beam is below 1 kHz. Thus, with ∼ 10 mW NH 3 laser power and 1 W microwave power, the sideband power should be more than adequate to observe the quantum jumps in the 494 nm fluorescence signal of Ba + .
Published Version
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