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Sensors & Detectors Features
IR Imaging Arrays Turn to Quantum Wells
A new semiconductor-based infrared detector technology for mid- and long-wavelength instruments is ready for the marketplace. The quantum-well infrared photodetector (QWIP) is based on absorption by confined carriers in multiple quantum wells. QWIPs have a narrow absorption spectrum that can be tailored to match any transition in the 3- to 20-mm wavelength range by adjusting the quantum well width and barrier layer composition. More important, they can be made using III-V semiconductors based...
Photonics Spectra, January 1997
Long-Period Gratings: Next Generation of Fiber Sensors
Fiber optic sensors, thanks to their size, flexibility and survivability advantages, continue to gain popularity as effective alternatives to conventional transducers. Two types have emerged as leaders in meeting the changing needs of industrial...
Photonics Spectra, January 1997
Raman Spectroscopy: Ready to Meet New Challenges
Once the realm of a few theorists, Raman spectroscopy has surged in popularity during the last decade. Improvements in optics, lasers, detectors and data analysis techniques have turned this laboratory technique into an industrial tool used even in...
Photonics Spectra, January 1997
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