UW Madison researchers have designed Quantum Cascade Lasers (QCLs) configured to achieve interstage carrier injection and lasing, without carrier leakage. This includes QCLs that also exhibit photon-i...
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Soft materials are everywhere. In many applications, valuable information about the strength of these materials enables more precise control in everything from cutting and processing soft foods to des...
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A terahertz quantum cascade laser device is provided comprising a substrate having a top substrate surface, a bottom substrate surface, and an exit facet extending between the top substrate surface an...
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Lidar is an acronym for Light Detection And Ranging. The technology may be used to measure distance by illuminating a target with a laser beam and performing analysis on the reflected laser beam light...
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Quantum cascade lasers (QCLs) are made of layered semiconductor materials. The structures’ cores are composed of tens of stages, each of which consists of three regions: an electron injector, an act...
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Semiconductor nanowire lasers are promising building blocks in state-of-the-art photonic and optoelectronic devices due to their advantageous properties – including ultracompact size, efficient wave...
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Many laser applications require multiple, simultaneous laser beams, each with a specific wavelength. But using multiple lasers and associated optical components increases the cost and size of the syst...
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Quantum cascade lasers (QCLs) are semiconductor lasers that provide light in the mid- and far-infrared wavelength ranges. They are designed so that the generated light is transverse-magnetic (TM) pola...
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Terahertz (THz) electromagnetic radiation penetrates cloth, paper and partially into the skin without the damaging effects of X-rays. Portable electronic devices capable of generating this radiation w...
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Quantum cascade lasers (QCLs) are made of layered semiconductor materials and are suited for a variety of applications, ranging from environmental monitoring to explosives detection and missile-avoida...
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For many applications – from remote sensing to laser displays – it is necessary to convert the frequency of light via nonlinear interaction in semiconductor materials. Waveguide devices accomplish...
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Microtubes are minute structures of layered metal that have shown wide promise in many fields. Beyond wireless sensing and drug delivery, they are poised to improve optical technologies. Fiber optic ...
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One type of light-emitting semiconductor laser is the Quantum Cascade Laser (QCL). Extending QCLs to short emission wavelengths (i.e., less than 4.0μm) is challenging due to strain-relaxation conside...
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Intersubband semiconductor lasers represent a new type of laser that emits photons when electrons within a quantum-well structure release their energy during transit from high- to low-energy states. A...
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Conventional 1300 nm lasers are based on the InGaAsP or InGaAlAs quantum well active material system on an InP substrate. However, these 1300 nm lasers experience poor lasing performance when operated...
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UW–Madison researchers previously developed high-power quantum cascade lasers (QCLs) with active-photonic-crystal structures to provide improved high-power, narrow-beam laser sources that operate in...
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Electromagnetic radiation may be generated by the acceleration or deceleration of charged particles such as electrons. Synchrotron radiation occurs when the trajectory of high-speed electrons is curve...
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Compact laser sources emitting in the mid- to long-wavelength infrared range (4 to 12 microns) currently are of great interest for spectroscopic applications in homeland security, laser photo-acoustic...
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Intersubband semiconductor lasers represent a new type of laser that emits photons when electrons within a quantum-well structure release their energy during transit from high- to low-energy states. A...
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Intersubband semiconductor lasers represent a new type of laser that emits photons when electrons within a quantum-well structure release their energy during transit from high- to low-energy states. O...
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Spectroscopic studies evaluate the response of a specimen to different colors of light. Lasers are normally used in spectroscopic studies; however, lasers typically operate in one or more cavity modes...
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Ultraviolet (UV) lamps are used as a source of white (multi-colored) UV light for many applications; however, these lamps are large and expensive, require a high voltage, generate a lot of heat and ma...
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Spectrometry is an analysis technique in which certain frequencies of light, relating to the absorption lines of a chemical species, are used to determine the chemical’s properties.  Some measureme...
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Measurements of emission and absorption spectra provide a valuable means of identifying and analyzing gases, liquids and solids. Fourier transform infrared (FTIR) and grating spectrometers are two com...
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Computer chips, composed of silicon (Si) semiconductors, store and transmit information as electrons.  The negative charge on electrons, however, hinders the speed with which information can be trans...
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