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We investigate 13 hyperfine structures of transition lines of 127I2 near 554nm, namely, the R(50) 22-0, P(46) 22-0, P(121) 24-0, P(69) 25-1, R(146) 25-0,R(147) 28-1, P(160) 26-0, P(102) 26-1, R(96) 23-0, R(49) 22-0, P(45) 22-0,P(92) 23-0, and R(72) 25-1 transitions, and measure their absolute frequencieswith an optical frequency comb. A 369 nm frequency-tripled laser is frequencystabilized by locking the 554 nm harmonic-frequency laser to the R(146) 25-0a15 line of 127I2 via modulation transfer spectroscopy. A frequency stabilityof 5E-12 is observed over a 1000 s integration time. The measurement of themolecular iodine spectroscopy at 554 nm enriches high-precision experimentaldata, and also enables theoretical predictions. Meanwhile, the 369 nmfrequency-tripled laser stabilized by molecular iodine spectroscopy has wideapplications in frequency metrology, and quantum information processing basedon Yb+ ions.

Absolute frequency measurement of molecular iodine hyperfine transitions  at 554 nm and its application to stabilize a 369 nm laser for Yb+ ions  cooling