| A comprehensive theory is presented for FM spectroscopy of no-Doppler-broadended molecular iodine saturated absorption. Modulation transfer spectroscopy technology has been studied. The whole circuit system for the 532nm iodine-stabilized Nd:YVO4/KTP laser has been developed. The idea of complex filter is put forward. The 532nm Nd:YVO4/KTP ring laser has been adopted as laser source. Stable single-mode output for the green light was obtained by optimizing several spectroscopic parameters and cavity length with precise temperature controlling of the Nd:YVO4 , KTP and diode laser. The laser frequency was stabilized after signal detecting , phase sensitive detecting , integrating and high voltage amplifying circuits with modulation transfer spectroscopy. A series of iodine absorption lines which were recommended by CCDM in 1997 have been observed using the single-frequency laser at 532nm. A frequency stability of 10-11~10-12 has been obtained with a reproducibility of 10-11~10-12.
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