Estimation of the linewidth enhancement factor for a PbCdS diode laser

An estimation of the linewidth enhancement factor alpha for a PbCdS diode laser is reported. The measurement method, which is an extension of an earlier procedure involving studies of mode spectra, was devised particularly for this lead-salt diode laser of very low output power. A quite low alpha of 1.3 was obtained, well below the values for other types of diode lasers.<
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