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Subthreshold gain spectrum of a 3.5 um W laser. The arrows mark the modes used to assess the differential gain and index. The inset shows a lasing spectrum slightly above threshold.
The center portion of the W gain spectrum shown in Fig. 1 The black curve is the data curve the blue curve is a functional fit using Eq. (2) which gave .
Phase vs for antimonide W-QW lasers vs a DH laser.
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