Direct link of a mid-infrared QCL to a frequency comb by optical injection |
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Authors: | Borri S Galli I Cappelli F Bismuto A Bartalini S Cancio P Giusfredi G Mazzotti D Faist J De Natale P |
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Institution: | Istituto Nazionale di Ottica (INO), Consiglio Nazionale delle Richerche (CNR), Firenze FI, Italy. simone.borri@ino.it |
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Abstract: | A narrow-linewidth comb-linked nonlinear source is used as master radiation to injection lock a room-temperature mid-infrared quantum cascade laser (QCL). This process leads to a direct lock of the QCL to the optical frequency comb, providing the unique features of narrow linewidth, absolute frequency, higher output power, and wide mode-hop-free tunability. The QCL reproduces the injected radiation within more than 94%, with a reduction of the frequency-noise spectral density by 3 to 4 orders of magnitude up to about 100 kHz, and a linewidth narrowing from a few MHz to 20 kHz. |
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