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We present mid-infrared frequency comb generation from crystalline MgF2 microresonators, with mode spacing of 50–150 GHz around the 2.5 μm-wavelength CW-pump. Low phase-noise is verified by beating the comb modes with a narrow linewidth CW laser.
Low-phase-noise and stable microwave signals are of prime importance in a variety of scientific and technological fields, such as, for example, atomic frequency standards1,2, radar and remote sensing, and very long baseline interferometry. The combination of ultra-stable lasers 3 and low noise optical frequency division by use a femtosecond laser presents a possibility to realize extremely low phase...
Measuring the beating signal between two phase-coherent frequency combs leads to a novel broadband spectroscopy, which improves a million-fold the resolution, the recording time and the accuracy of the frequency scale of Fourier transform spectroscopy, which has been up to now the most efficient technique for multiplex optical diagnostics. With a demonstrated thousand-fold enhancement of the absorption...
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