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Optical Frequency Combs
In article number 2200224, Lukasz A. Sterczewski and colleagues present a mid‐infrared semiconductor diode laser that emits equidistant optical lines referred to as a frequency comb. The device compatible with battery bias offers 1 THz of optical coverage at 3.04 µm of wavelength with comb teeth spaced by 10 GHz. Narrow optical line widths enable free‐running dual‐comb spectroscopy...
Mid‐wave infrared (MIR, 3–5 µm) optical frequency combs (OFC) are of critical importance for spectroscopy of fundamental molecular transitions in space and terrestrial applications. Although in this band OFCs can be obtained via supercontinuum or difference frequency generation using optical pumping schemes, unprecedented source miniaturization, and monolithic design are unique to electrically‐pumped...