Vapor-cell frequency reference for short-wavelength transitions in neutral calcium
Abstract
We have characterized the molecular tellurium (Te2) spectrum in the vicinity of the 423nm 1S0-1P1 and the 431nm 3P1-3P0 transitions in neutral calcium. These transitions are relevant to optical clocks for atomic-beam characterization and cooling (423nm) and enhanced detection (431nm). The use of a Te2 vapor cell as a frequency reference has many advantages over other laser stabilization techniques, and we discuss an application to measuring the instability due to the second-order Doppler shift in a calcium beam clock.
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