Abstract

The iodine molecule has frequently been used as a frequency reference from the green to the near-infrared wavelength region (500900nm). We describe the frequency locking of the second-harmonic signal of a 197.2-THz (1520.25-nm) distributed-feedback diode laser to the absorption lines of the iodine hyperfine structure; a frequency jitter below 0.1MHz was achieved at a 300-ms time constant. This scheme provides a simple, compact, and high-performance frequency reference in the optical communication band.

© 2005 Optical Society of America

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