Abstract
A system is described for the absolute frequency measurement of a laser source at 445 THz probing a narrow resonance of a trapped single ion of strontium. The 474-THz frequency from a laser referenced to an iodine-stabilized helium–neon laser and a known 29-THz frequency from a saturation-stabilized carbon dioxide laser are mixed in an AgGaS2 nonlinear crystal to synthesize the 445–THz radiation. A preliminary measurement of the 88Sr+ 5s2S1/2 −4d 2 D5/2 center frequency yielded a frequency of 444 779 044.14 ± 0.39 MHz (1σ).
© 1996 Optical Society of America
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