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Molecular spectroscopy can potentially achieve very high frequency resolution, but transitions are generally very weak. The scientific community has tried to tackle this problem by increasing the interaction path length using extremely long cells, sophisticated multipass cells and Fabry-Perot cavities. As such, molecular spectroscopic methods do not lend themselves naturally to miniaturization. Compact...
We report the phase-locking of a quantum cascade laser (QCL) at 10 μm to the secondary frequency standard of this spectral region, a CO2 laser stabilized on a saturated absorption line of OsO4. The stability and accuracy of the standard are transferred to the QCL resulting in a line width of the order of 10 Hz. The locked QCL is then used to perform high-resolution linear and saturated absorption...
Quantum cascade lasers (QCLs) are an emerging technology [1] suitable for high-resolution spectrocopy and frequency metrology [2] with an incomparable frequency tunability in the mid-infrared range. We are currently developing a new compact, widely tunable QCL-based spectrometer. Such an instrument will broaden the scope of our experimental setups dedicated to molecular spectroscopy-based precision...
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