Wavenumber measurements of sub-Doppler spectral lines of Rb at 1.3 mu m and 1.5 mu m

1.3- mu m and 1.5- mu m distributed-feedback semiconductor lasers have been frequency stabilized to sub-Doppler resonances of the 5P/sub 1/2/ to 6S/sub 1/2/ and the 5P/sub 3/2/ to 4D/sub 3/2,5/2/ transitions of /sup 85,87/Rb atoms, respectively. Using these stabilized lasers, the absolute wavenumbers of the transitions have been measured interferometrically with an accuracy of 2*10/sup -7/.<
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