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Spontaneously broadened emission from a distributed feedback laser diode perated just above threshold is used as a pump source in Brillouin slow light systems. The pump spectrum could this way be extended to several GHz.
Demetri Psaltis, Christophe Moser, Ilker Oguz, Mustafa Yildirim, Niyazi Ulas Dinç, Jih-Liang Hsieh