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In an external cavity (EC) quantum cascade laser, the quantum cascade device serves as the laser gain medium. One, or both, of the waveguide facets has an anti-reflection coating that defeats the optical cavity action of the cleaved facets. Mirrors are then arranged in a configuration external to the QC device to create the optical cavity.
In 2014, Thorlabs acquired Corning Inc.'s line of quantum cascade lasers and entered into a partnership with Daylight Solutions to produce the laser for defense and security applications. [28] In 2015, Thorlabs acquired Pantec's line of Elliptec product line. [29] In 2018, Thorlabs acquired Norland Products' line of fiber optic products. [30]
Laser types with distinct laser lines are shown above the wavelength bar, while below are shown lasers that can emit in a wavelength range. The height of the lines and bars gives an indication of the maximal power/pulse energy commercially available, while the color codifies the type of laser material (see the figure description for details).
In 2002, Daniel Hofstetter, Mattias Beck and Jérôme Faist reported the first ever use of an InGaAs/InAlAs quantum-cascade-laser structure for photodetection at room temperature. The specific detectivity of the device was shown to be comparable to the detectivity of more established detectors at the time, such as QWIPs or HgCdTe detectors. [ 13 ]
In a standard multiple quantum well laser, the active quantum wells used to generate photons are connected in parallel. Consequently, a large current is required to replenish each active well with electrons as it emits light. In a cascade laser, the wells are connected in series, meaning that the voltage is higher but the current is lower.
The spectroscopy is based on semiconductor quantum cascade laser frequency combs [1] [2] in the mid-infrared wavelength range. The company is based in Zurich , Switzerland and was founded in 2014 and acquired by Sensirion Holding in May 2021.
Quantum cascade laser (QCL) is a construction of such alternative. It is a solid-state semiconductor laser that can operate continuously with output power of over 100 mW and wavelength of 9.5 μm. A prototype was already demonstrated. [2] and potential use shown. [3] A molecular FIR laser optically pumped by a QCL has been demonstrated in 2016. [4]
Laser direct infrared imaging (LDIR) is an infrared microscopy architecture that utilizes a tunable Quantum Cascade Laser (QCL) as the IR source. [1] This new reflectance-based architecture eliminates coherence artifacts typically associated with QCLs.