Quantum Dot Laser
Wednesday, 03 July, 2002
An optically pumped nanocrystal quantum dot laser has been demonstrated by a group at MIT. The gain medium consists of nm-sized particles of CdSe coated with a layer of organic molecules and then immersed in a glassy film. The medium sits in a waveguide atop a grating. The fabrication advantage in this case derives from the fact that one uses simple solution processing rather than the technique of epitaxy usually needed for semiconductors.
The colour of the output laser light can be varied by changing the size of the CdSe particles, the grating spacing, or the refractive index of the waveguide.
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