Abstract

We report absolute frequency measurements of 19 hyperfine components of the rovibrational transition of molecular iodine R(53) 31-0 transitions at 534 nm with an optical frequency comb. The 534 nm laser, which is frequency-doubled from a 1068 nm external-cavity diode laser, is frequency stabilized to a hyperfine component of the I2127 R(53) 31-0 transition using modulation transfer spectroscopy. A frequency stability of 8×1012 at 1 s averaging time is achieved when its frequency is stabilized to the a21 component. To obtain the absolute frequency, the pressure shift and power shift of the a21 component are investigated. The absolute frequency of the laser locked to the a21 hyperfine component of the R(53) 31-0 transition is measured to be 561 420 951 318±8 (type-A) ±12 (type-B) kHz. The observed hyperfine transitions of the iodine can be good frequency references at 534 nm and are especially useful for research on the aluminum ion optical clock, because the frequency of the iodine hyperfine transitions is close to the second sub-harmonic frequency of the S01-P13 transition of the aluminum ion at 267 nm.

© 2019 Optical Society of America

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