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Spectroscopy Features
Passive Hyperspectral Imagers See Chemical Clouds
Interest in the detection, identification and quantification of chemicals in the gaseous state from a safe distance has increased in the context of domestic defense applications. One promising method to achieve such standoff detection and quantification involves imaging spectroradiometry in the thermal infrared region. This passive method of chemical analysis relies on the imbalance of emission and absorption of chemical species in the field of view of the instrument. If the gas is warmer...
Photonics Spectra, September 2005
Optically Active Quantum Dots Embedded in Nanowires
Investigators at the Swiss Federal Institute of Technology in Zurich have reported the fabrication of quantum dots in nanowires that display a level of brightness an order of magnitude higher than self-assembled InAs dots. They suggest that the work...
Photonics Spectra, August 2005
Quantum Dots: Small Structures Poised to Break Big
Imagine a mechanical part that can tell when it is worn out. Or an ink that is impossible to counterfeit. Or an infrared paint that can help to distinguish friends from enemies using night-vision equipment. These seemingly unconnected...
Photonics Spectra, July 2005
Laser-Induced Breakdown Spectroscopy Promises a Quicker, More Thorough Analysis of Martian Rock
One thing was clear from the surface images provided by the Mars Pathfinder and Mars Exploration rover missions: Mars is a dusty planet. Boulders, rocks, pebbles and soils have coatings of dust that are millimeters to centimeters thick. Steps...
Photonics Spectra, May 2005
LED Metrology Keeps Pace with Application Demands
Advances in technology have made it possible for LED light sources to replace conventional lighting for such uses as automotive lighting and backlighting for liquid crystal displays. Such applications have stringent requirements to guarantee quality...
Photonics Spectra, May 2005
Infrared Astronomy Takes Saturn's Temperature
As anyone who has been caught in a rainstorm without an umbrella can testify, weather modeling and prediction are not exact sciences. Although the basic physics underlying atmospheric dynamics is relatively straightforward, complexity grows rapidly...
Photonics Spectra, April 2005
Multispectral Imaging of Mars Reveals a Long-Dry Planet
The latest word on martian water and the possibility of life on the Red Planet comes courtesy of Observatoire pour la Minéralogie, l’Eau, les Glaces et l’Activité, or Omega, a visible and infrared mapping spectrometer aboard the European Space...
Photonics Spectra, April 2005
Successful Detector Design Is a Game of Give and Take
InGaAs short-wave infrared imaging is growing rapidly. In military circles, it is emerging as a complement to thermal imaging for covert surveillance, fire control and training, and as the ideal solution for eye-safe laser imaging. In commercial...
Photonics Spectra, April 2005
UV Spectroscopy Detects Martian Nightglow
When atmospheres settle down for the night, they glow as photodissociated atoms stream from dayside to night-side and combine in the dark. Scientists analyze this effect, called nightglow, because it reveals facts about atmospheric composition and...
Photonics Spectra, April 2005
Slower Growth Forecast for Optical Microscopes
You can’t fight physics. Despite the continued and great advances made in optical microscopy over the more than 300 years since Antonie van Leeuwenhoek first presented his observations of bacteria in the Royal Society of England’s Philosophical...
Photonics Spectra, February 2005
Measuring High-Power Diode Laser Efficiency
The National Institute of Standards and Technology (NIST) has been tasked by the Defense Advanced Research Projects Agency with providing wall-plug efficiency and spectral measurements of high-power, high-efficiency laser diodes and arrays as part...
Photonics Spectra, January 2005
New Spectroscopy Methods Discover the Tiniest Particles
As recently as a few decades ago, most manufacturing industries worried only about those contaminants in their processes that were large enough to cause product failure or customer complaints. In contrast, troubleshooting labs today run on continual...
Photonics Spectra, January 2005
Atomic Spectroscopy:A Looking-Glass View of thePast, Present and Future
The oldest atomic spectroscopy technique is flame emission spectrophotometry, first employed by Gustav R. Kirchhoff and Robert W. Bunsen in the mid-1800s. Spark emission spectrometry was a natural progression of the method and was developed in the...
Photonics Spectra, December 2004
Infrared Chemical Imaging: The Future of FourierTransform IR Spectroscopy
Fourier transform infrared (FTIR) spectroscopic techniques are valued for their rapid, nondestructive analysis of materials as well as for their ability to identify the chemical signature of small samples. The Michelson interferometer is the...
Photonics Spectra, December 2004
Controlling and Calibrating Optics
Accommodating the spreads of component characteristics in electro-optic assemblies is one of the biggest challenges facing manufacturers today. This applies to test instruments, telecom equipment, fiber lasers and miniature spectroscopy units....
Photonics Spectra, November 2004
Motion Control Meets the Vacuum
Traditional motion-control devices, including stepper motors and DC servomotors, were designed for the industrial manufacturing environment and brought repeatability and accurate automation to processes such as cutting and welding. However, most of...
Photonics Spectra, October 2004
Through the Looking Glass and What Cavity Ringdown Found There
What is air? Scientists worldwide continue to focus their attention and their instruments on answering that simple question with an ever-increasing standard for accuracy. It is no longer sufficient to know that air is composed mostly of nitrogen and...
Photonics Spectra, October 2004
Silicon Carbide Is Poised to Enter the Mainstream
NASA systems designers are always looking to minimize mass on solar system exploration projects because every gram comes at a stiff price. When they found a lightweight material that could be used to manufacture the structure and mirror substrates...
Photonics Spectra, August 2004
CCD Cameras Tune in to Scientific Imaging
Since their first appearance some 30 years ago, CCDs have been embraced by the scientific imaging and spectroscopy communities for their extraordinary ability to quantify light. Over the years, their performance has been bolstered by a number of...
Photonics Spectra, April 2004
Spectroscopy Takes Security into the Field
With important advances in the miniaturization, cost and performance of optoelectronic devices and sampling accessories, techniques such as fluorescence spectroscopy and laser-induced breakdown spectroscopy have found new applications in...
Photonics Spectra, April 2004
Testing the Water
Shortly after Sept. 11, an incident arose in which a water reservoir had been tampered with. The severity and seriousness of the act resulted in speculations of terrorist activity. The reservoir in question was the primary water source for a...
Photonics Spectra, April 2004
Hollow Retroreflectors Promote Precision Optical Alignment
Precision optical alignment capability across a range from the UV to the far-IR and a lighter-weight design have long given hollow retroreflectors an advantage over their solid cousins (retroreflector prisms) in boresighting, laser tracking,...
Photonics Spectra, March 2004
Hollow Silica Waveguides Offer IR Solutions
Applications in the mid- and far-infrared regions have long suffered from the lack of a reliable, cost-effective means of guiding optical power in an optical fiber or other flexible waveguide. Many systems still depend on line-of-sight...
Photonics Spectra, March 2004
Inductively Coupled Plasma Fuels Elemental Spectroscopy
Over the past three decades, inductively coupled plasma, which forms during inductive heating of ionized gas, has become a valuable source for elemental spectroscopy. In induction-coupled plasma spectroscopy, plasma formation involves passing an...
Photonics Spectra, March 2004
Where Spectroscopy and Fiber Optics Meet
The intersection of spectroscopy and fiber optics continues to give rise to some very interesting results. Spectroscopy, with its ability to determine chemical and mineralogical composition, temperature, emission and molecular activity, is still...
Photonics Spectra, March 2004
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