Abstract
A 500-μm-long cavity laser diode with 5 layers of In As quantum dot was fabricated. The laser materials were grown by gas-source molecular beam epitaxy. For the first time,the linewidth enhancement factor was acquired by gain fitting and weighted wavelength. Gain fitting is an important complement to Hakki-Paoli method,and plays an important role in evaluating whether the gain is saturation. The differential modal gain was evaluated by numerical differentiation of the maximum modal gain. The differential modal gain showed a maximum of 1. 33 cm- 1/ m A at 50 m A,and dropped off to 0. 34 cm- 1/ m A at 57 m A( ≈0. 99Ith). The weighted average wavelength was treated as central wavelength in order to calculate the wavelength movement. It was found that Δλ decreased slowly until closed to zero. The new method avoids the error due to selecting the data points,and the value of linewidth enhancement factor is from 0. 12 to 2. 75.
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