Abstract

We demonstrate high-resolution spectroscopy of molecular iodine using coin-sized laser modules at 531 nm, 561 nm, and 594 nm. Hyperfine components of the $R(36)32\text{-}0$, $P(64)20\text{-}0$, and $P(69)12\text{-}1$ transitions are observed with a signal-to-noise ratio of several tens over a bandwidth of 100 Hz. The laser modules are frequency-stabilized to the observed hyperfine components and achieve stabilities at a level of ${10}^{-12}$ for a 1-s averaging time. The frequency-stabilized coin-sized laser modules are useful for various applications, including interferometric measurements and studies of molecular iodine.

© 2019 Optical Society of America

Compact iodine-stabilized laser operating at 531 nm with stability at the 10⁻¹² level and using a coin-sized laser module

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