Kilohertz linewidth from frequency-stabilized mid-infrared quantum cascade lasers.
Frequency stabilization of mid-IR quantum cascade (QC) lasers to the kilohertz level has been accomplished by use of electronic servo techniques. With this active feedback, an 8.5-microm QC distributed-feedback laser is locked to the side of a rovibrational resonance of nitrous oxide (N(2) O) at 1176.61cm (-1) . A stabilized frequency-noise spectral density of 42Hz/ radicalHz has been measured at 100 kHz; the calculated laser linewidth is 12 kHz.
Williams
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Kelly
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Hartman
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Sharpe
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Taubman
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Hall
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Capasso
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Baillargeon
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