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Mid-IR Broadband Quantum Cascade Laser Frequency-Comb

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Abstract

We show a free-running broadband QCL emitting a frequency-comb of 490 nm at 7µm whose spectral phase signature resembles to the one of a frequency-modulate laser. Beatnote-linewidths as narrow as f < 10Hz are measured.

© 2012 Optical Society of America

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