Abstract

The saturation spectrum of the P(84) 5–5 transition of ${{}^{127}\text{I}}_2$ at $657.483\text{\hspace{0.17em} nm}$ is obtained with the third-harmonic demodulation method using an external cavity diode laser. The laser frequency is modulated by modulating the diode current instead of modulating the cavity length with a piezoelectric transducer (PZT). Current modulation allows a modulation frequency that is higher than PZT modulation. The signal-to-noise ratio of 1000 is better than previous results presented in the literature. The laser is frequency stabilized to the hyperfine component o of the P(84) 5–5 transition with a frequency stability of better than $10\text{\hspace{0.17em} kHz}$ $\text{(}2.2\times {10}^{-11}$ relative stability).

© 2006 Optical Society of America

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