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Provides mid-infrared laser systems and ultra-sensitive gas sensing instruments that address needs in the detection of trace gases in medical, environmental, industrial, and national security applications.

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FIGURE 1. The VeloXscan QCL by Pranalytica shows simultaneous two-frequency operation.

Lasers & Sources

Photonics Products: Tunable Lasers: Commercial quantum-cascade laser technology matures

Four example innovations by quantum-cascade laser companies show us where the industry is going.

From the experimentally measured dependence of slope efficiency (a) and threshold current density (b) on QCL cavity length, the injection efficiency can be determined. Here, an injection efficiency (ηi) of 70%, waveguide losses (αw) of 1.6 cm-1, differential gain (g) of 14 cm/kA, and transparency current density (Jtr) of 1.3 kA/cm2 were determined. All but the threshold current density are parameters that can be determined from a model.

Lasers & Sources

QUANTUM-CASCADE LASERS: Long-wavelength QCL emits 2 W at 9 μm

Long-wavelength quantum-cascade lasers (QCLs) with record-high pulsed and continuous-wave (CW), room-temperature wall-plug efficiencies of 16% and 10% have been created by researchers...

FIGURE 1. Typical QCLs are based on a two-phonon resonance approach in which the radiative transition from the upper laser level 4 to the lower laser level 3 is followed by two consecutive nonradiative transitions to the levels 2 and 1 (left). The nonresonant extraction QCL active-region design removes the resonance condition without sacrificing the efficient carrier extraction from the lower laser level (right).

Lasers & Sources

QUANTUM CASCADE LASERS: Advances push QC lasers into the mainstream

Performance breakthroughs and ease of use lead to commercial availability of multiwatt mid-wave infrared lasers.

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