Abstract
Two internal mirror HeNe lasers emitting at 543.5 nm wavelength were frequency stabilized to hyperfine components of the iodine R(12)26-0 and R(106)28-0 transitions utilizing frequency-modulation spectroscopy. Beat frequency measurements yielded difference frequencies which differ in a range of +1.8 kHz to -0.8 kHz. Realizing nearly shot noise limited detection, the minimum two probe standard deviation of 2.7x10 -13 was reached at a sampling time of 10000 s using an iodine pressure of 1.44 Pa. From the measured hyperfine line splitting hyperfine structure coupling have been calculated. The wavelength of the reference HFS-component α 9 has been measured.
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