Vapor-cell frequency reference for short-wavelength transitions in neutral calcium

摘要

We have characterized the molecular tellurium (Te-2) spectrum in the vicinity of the 423 nm S-1(0)-(1)P(1 )and 431 nm P-3(1)-P-3(0) transitions in neutral calcium. These transitions are relevant to optical clocks for atomic-beam characterization and cooling (423 nm) and enhanced detection (431 nm). The use of a Te-2 vapor cell as a frequency reference has many advantages over other laser stabilization techniques, and we discuss an application to measure the instability due to the second-order Doppler shift in a calcium beam clock..