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We demonstrate a technique to measure hyperfine structure using afrequency-stabilized diode laser and an acousto-optic modulator locked to thefrequency difference between two hyperfine peaks. We use this technique tomeasure hyperfine intervals in the $5P_{3/2}$ state of $^{85}$Rb and obtain aprecision of 20 kHz. We extract values for the magnetic-dipole couplingconstant $A=25.038(5)$ MHz and the electric-quadrupole coupling constant$B=26.011(22)$ MHz. These values are a significant improvement over previousresults.Comment: 4 pages, 4 figure

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Precise measurement of hyperfine structure in the $ \mathsf {5P_{3/2}}$ state of $ \mathsf {^{85}}$ Rb