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Linking the 474 THz HeNe/I2 standard to the 445 THz single Sr+ trapped ion standard: heterodyne frequency measurements using an OsO4 stabilized 29 THz laser system

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5 Author(s)
Madej, A.A. ; Inst. for Nat. Meas. Stand., Nat. Res. Council of Canada, Ottawa, Ont., Canada ; Siemsen, Klaus J. ; Marmet, L. ; Bernard, J.E.
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A 29 THz CO2 laser system operating on the 10 μm R(0) line has been developed, which is frequency-stabilized by third harmonic locking to a saturated absorption resonance of OsO4. By difference frequency mixing this radiation and 474 THz radiation referenced to a HeNe/I2 laser standard, sufficient 445 THz power is obtained for an absolute heterodyne measurement of the 445 THz radiation probing a 88Sr+ single ion reference transition. A new series of measurements give a value of 444779044086 kHz±12 kHz for the 88Sr+, 5s2S 1/2-4d2D5/2 center frequency

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Instrumentation and Measurement, IEEE Transactions on  (Volume:48 ,  Issue: 2 )