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10 March 2016Gigahertz dual-comb modelocked diode-pumped semiconductor and solid-state lasers
We present a simple approach to generate simultaneously two gigahertz mode-locked pulse trains from a single gain element. A bi-refringent crystal in the laser cavity splits the one cavity beam into two cross-polarized and spatially separated beams. This polarization-duplexing is successfully demonstrated for both a semiconductor disk laser (i.e. MIXSEL) and a diode-pumped solid-state Nd:YAG laser. The beat between the two beams results in a microwave frequency comb, which represents a direct link between the terahertz optical frequencies and the electronically accessible microwave regime. This dual-output technique enables compact and cost-efficient dual-comb lasers for spectroscopy applications.
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S. M. Link, M. Mangold, M. Golling, A. Klenner, U. Keller, "Gigahertz dual-comb modelocked diode-pumped semiconductor and solid-state lasers," Proc. SPIE 9734, Vertical External Cavity Surface Emitting Lasers (VECSELs) VI, 973406 (10 March 2016);