We have recently demonstrated intersubband unipolar lasers in the wavelength region between 4.2 and 4.6 /spl mu/m. In these devices light is generated by electronic transitions between conduction band subbands arising from size quantization in quantum wells. The emission wavelength is therefore controlled by the layer thicknesses and can be tailored in a wide spectral range using the same heterostructure material. We substantiate this claim and report QC lasers operating at more than twice the wavelength of the previous ones, proving that the same design criteria can be indeed extended to fabricate semiconductor lasers where the lasing transition is independent upon the material band gap.
Quantum cascade lasers in the 8-9 /spl mu/m wavelength region
1995-01-01
122065 byte
Conference paper
Electronic Resource
English
Quantum Cascade Lasers in the 8-9um Wavelength Region
British Library Conference Proceedings | 1995
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British Library Conference Proceedings | 2002
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