Article comprising a dual-wavelength quantum cascade photon sour

Details Article comprising a dual-wavelength quantum cascade photon sour Article comprising a dual-wavelength quantum cascade photon sour

1998-03-02

2000-11-07

Davie, James W.

Coherent light generators

Particular active media

Semiconductor

257 14, 372 23, 372 50, H01S 319

Patent

active

061446815

ABSTRACT:
The quantum cascade (QC) photon source according to this invention can emit simultaneously at two distinct wavelengths, typically both in the mid-infrared. This is accomplished through provision of a semiconductor layer structure in which, at the proper bias voltage, electrons are injected into an energy level E.sub.3 and then forced to cascade through an intermediate level E.sub.2 before reaching the ground state E.sub.1 of the active region. In the process, photons of energy E.sub.3 -E.sub.2 (wavelength .lambda..sub.1) and E.sub.2 -E.sub.1 (wavelength .lambda..sub.2) are emitted. Dual wavelength photon sources according to this invention can be used in a variety of ways, e.g., to determine the absorption of a gaseous sample at wavelengths .lambda..sub.1 and .lambda..sub.2, exemplarily to determine the concentration of a particular chemical compound in the sample.

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