@article {Opacak:21,
	title = {Spectrally resolved linewidth enhancement factor of a semiconductor frequency comb},
	journal = {Optica},
	volume = {8},
	number = {9},
	year = {2021},
	month = {Sep},
	pages = {1227{\textendash}1230},
	publisher = {OSA},
	abstract = {The linewidth enhancement factor (LEF) has recently moved into the spotlight of research on frequency comb generation in semiconductor lasers. Here we present a novel modulation experiment that enables direct measurement of the spectrally resolved LEF in a laser frequency comb. By utilizing a phase-sensitive technique, we are able to extract the LEF for each individual comb mode in any laser type. We first investigate and verify this universally applicable technique using Maxwell{\textendash}Bloch simulations. Following, we present the experimental demonstration on a quantum cascade laser frequency comb, confirming the predicted key role of the LEF in frequency comb dynamics.},
	keywords = {frequency combs, laser modes, Multimode lasers, semiconductor lasers, Single mode lasers, tunable lasers},
	doi = {10.1364/OPTICA.428096},
	url = {http://www.osapublishing.org/optica/abstract.cfm?URI=optica-8-9-1227},
	author = {Opa{\v c}ak, Nikola and Florian Pilat and Kazakov, Dmitry and Sandro Dal Cin and Georg Ramer and Bernhard Lendl and Federico Capasso and Schwarz, Benedikt}
}
