Abstract

We present a tunable extended-cavity semiconductor laser, based on the Littman configuration, which has been frequency-stabilized to Doppler-free hyperfine transitions in I2. The stability was measured compared with the reference He–Ne–I2 laser system, whereas the semiconductor laser was locked on components of the P(33) 6—3 transition close enough to the reference R(127) 11—5 line to allow beat frequency counting. A relative stability of 4 × 10-12 over a 100-s integration time was achieved. The laser configuration allowed mode-hop-free tuning over a range including the P(33) 6—3 transition and the group of strong overlapping transitions R(60) 8—4, R(125) 9—4, and P(54) 8—4 with higher signal-to-noise ratio than the P(33) 6—3 located approximately 13 GHz toward lower optical frequencies.

© 2000 Optical Society of America

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