Table 1 Details of the hyperfine transitions observed and their respective linewidth.

From: Frequency stabilization of multiple lasers to a reference atomic transition of Rb

Peak

Hyperfine transition

FWHM (MHz)

1

Fg = 3 to Fe = 4

13.73

2

Fg = 3 to Fe = CO34

20.75

3

Fg = 3 to Fe = CO24

21.83