| 摘要 |
A light source is based on a combination of silicon and calcium fluoride (CaF<SUB>2</SUB>). The silicon and the calcium fluoride need not be pure, but may be doped, or even alloyed, to control their electrical and/or physical properties. Preferably, the light source employs interleaved portions, e.g., arranged as a multilayer structure, of silicon and calcium fluoride and operates using intersubband transitions in the conduction band so as to emit light in the near infrared spectral range. The light source may be arranged so as to form a quantum cascade laser, a ring resonator laser, a waveguide optical amplifier.
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