We narrow QCL radiation below 1 kHz by using two different techniques: frequency locking to a molecular transition and phase locking to an absolutely-referenced difference-frequency-generated source. Applications of both techniques are presented
© 2013 OSA
F. Cappelli, S. Bartalini, P. Cancio, I. Galli, G. Giusfredi, D. Mazzotti, and P. De Natale, "Subkilohertz-narrowed, Frequency/phase-locked Mid-IR Quantum Cascade Lasers for High-precision Molecular Spectroscopy," in CLEO: 2013, OSA Technical Digest (online) (Optical Society of America, 2013), paper CTu3I.2.
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