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Semiconductor quantum dots can be used for an optical gain-chip in an external cavity to construct a stable two- or few-mode laser. In this study, we demonstrate wide-range mode separation control of a few-mode laser by using a multistep etalon filter. Since the precise control of multistep thickness in one etalon plate was achieved, the frequency separation of the few-mode laser can be changed by...
We have developed a stable two-mode laser by using a quantum dot optical gain chip in an external cavity. In this study, we demonstrate continuous change of frequency separation of a two-mode laser by using a birefringent etalon filter. Since the polarization of the quantum dot optical gain chip is TE-dominant, the frequency separation of the two-mode laser is controlled by rotating the birefringent...
We fabricated laser diodes containing highly stacked InAs quantum dots using a strain-compensation technique. The quantum dots exhibited laser emissions from 1.47 to 1.7 µm and a high characteristic temperature of 113 K.
We fabricated laser diodes containing highly stacked InAs quantum dots using the strain compensation technique, which showed laser emissions from 1.47 to 1.7 µm above the threshold current in pulsed mode.
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