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Features
Raman Lasers Offer Power and Wavelength Versatility
Have you ever wanted to convert your laser to another color at the flick of a switch? Perhaps you are a dermatologist, wanting to quickly move from treating spider veins on the nose to acne or spots of hypopigmentation on sun-damaged cheeks. The ability to change the laser from hemoglobin-absorbing yellow to melanin-absorbing green and thence to the red for photodynamic therapy would reduce treatment time and enhance treatment selectivity. In fact, a host of applications in biomedicine,...
Photonics Spectra, July 2005
The Pros and Cons of Protected and Surface Coatings for High-Phase-Thickness Applications
Metal salt compounds, or dielectrics, produce thin-film coatings with precise spectral control. Because they are soft and require glass coverslips laminated to the coating substrate to protect them from damage, they are called protected coatings....
Photonics Spectra, July 2005
The US Photonics Job Market
Research on people’s views of their job brings out some interesting perceptions, and this year’s US photonics job salary study is no different. After several years of small gains in salary for most positions, you would expect individuals to be...
Photonics Spectra, July 2005
Understanding Lenses: Aplanats and Achromats
Optics terminology can be confusing, but it is critical to be fluent in the language when searching for and specifying optical components. This is especially true for multielement lenses, the two most basic of which are aplanats and...
Photonics Spectra, July 2005
Virtual Photodetectors: Building Your Own Detector
Photodetectors are available in multiple configurations, with point, quadrant, linear and 2-D arrays being among the better known. These devices offer optimal performance for dedicated tasks, and they require processing and digitizing electronics...
Photonics Spectra, July 2005
Aircraft Inspections Improved with Photonics
At the Federal Aviation Administration’s (FAA) William J. Hughes Technical Center at the Atlantic City International Airport in New Jersey, Robert A. Pappas and others like him sweat the small stuff. Among their other activities, the engineers...
Photonics Spectra, June 2005
Cooling Detectors to Improve Performance: A Look at Applications and Technologies
Thermally induced noise — called dark-current noise in CCDs and Johnson noise in x-ray and gamma-ray detectors — can degrade the signal-to-noise ratio of a detector, impeding detection of weak signals. Cooling a detector reduces the leakage current,...
Photonics Spectra, June 2005
Direct Pumping of Quantum Wells Improves Performance of Semiconductor Thin-Disk Lasers
When the thin-disk laser appeared on the scene more than a decade ago, it was the first solid-state laser capable of efficiently producing a high-optical-quality output in the multikilowatt range.1 Its principle is to use a very thin section of...
Photonics Spectra, June 2005
Femtosecond Laser Prints Biomolecules
Dense, high-resolution patterns of various biological molecules have been fabricated using direct laser printing with a source of 500-fs ultraviolet pulses. Demonstrated at the Foundation for Research and Technology — Hellas’ Institute of Electronic...
Photonics Spectra, June 2005
Filters to Bragg About
The fine spectral processing capability of volume holographic gratings — holographic media where the grating is physically present throughout its volume with a thickness >100 μm — is generating renewed interest for applications in lasers,...
Photonics Spectra, June 2005
Freezing Time in 3-D
In microscopy, researchers strive for better resolution and faster data processing. Piezoelectric positioning devices, which have been used in some form for years, can help them meet these needs. When using a piezoelectric Z-axis positioning...
Photonics Spectra, June 2005
Frequency-Scanning Interferometry Advances Precision Component Manufacturing and Assembly
A growing number of precision component manufacturers are machining objects that have micron- or submicron-level tolerances on parameters such as flatness, thickness and parallelism. They are discovering that the assembly of subcomponents that are...
Photonics Spectra, June 2005
Intematix Licenses Alternative Phosphors for White LED
Building on its work in rapid materials discovery, Intematix Corp. of Moraga, Calif., recently developed new phosphors for white LEDs and other lighting applications. Currently, YAG is the dominant phosphor technology for use in white LEDs. With...
Photonics Spectra, June 2005
Long-Range Motion with Nanometer Precision
In several research applications, such as molecular spectroscopy and Förster resonance energy transfer (FRET), long-range motion is used to zoom in on a specific area of interest so that it can be studied at the nanometer scale. In drug discovery...
Photonics Spectra, June 2005
Microscopic Coolers Chill to Millikelvin Temperatures
Ultralow temperatures are required for a variety of next-generation sensors, but refrigeration techniques for reaching 0.1 K have been complicated and expensive. Now a group at the National Institute of Standards and Technology (NIST) in Boulder,...
Photonics Spectra, June 2005
Nanophotonics Heads into the Third Dimension
Scientists at the University of California, Los Angeles, have demonstrated a way to exploit the third dimension to create tiny optical components. Going vertical should enable the fabrication of densely integrated optical structures and offer...
Photonics Spectra, June 2005
Near-IR Microscopy Images Nanotubes
A team of scientists at Rice University in Houston has reported that near-infrared fluorescence microscopy is suitable for the study of single-walled carbon nanotubes. Basic research into these structures, as well as the development of superior...
Photonics Spectra, June 2005
New Challenges for Microscope Positioning
The axiom “Specialization is a necessary consequence of ubiquity” holds more truth today than ever for microscope positioning and motorized stages. Applications such as live-cell studies, image tiling, virtual microscopy and time-lapse studies are...
Photonics Spectra, June 2005
New Report Highlights LEDs in Automobiles
The market for LEDs in the automotive sector has skyrocketed in recent years. According to “Opportunities & Challenges for Photonics in the Automotive,” a report from Yole Développement of Lyon, France, the use of photonics for these...
Photonics Spectra, June 2005
Next-Generation Autotuned Optical Tables
Optical tables, along with pneumatic vibration isolators, have numerous applications in research and high-precision manufacturing. In their basic form, optical tables consist of a sandwich structure: two faceplates and a lightweight honeycomb core....
Photonics Spectra, June 2005
Perforated Cathode Improves Organic LED Efficiency
Organic LEDs may have a bright future, but it would be brighter still if they were more efficient. Now researchers from the University of Utah in Salt Lake City have increased the electrolu-minescence efficiency of an organic LED sevenfold by...
Photonics Spectra, June 2005
Photosensitive Polymer Takes a Near-Field Picture
Near-field optical phenomena have attracted attention because they promise to enable finer resolution in microscopy than is otherwise possible. Consequently, the optical near-fields of nanostructures have been a subject of both theoretical and...
Photonics Spectra, June 2005
Processing Materials by Mixing Fire and Water
Water-jet cutting and laser cutting are well-established materials-processing techniques. In recent years, a process that combines both technologies — called the water-jet-guided laser — has come into use for micromachining. Although all three...
Photonics Spectra, June 2005
Temperature Control: No Trivial Element of Design
Applications requiring temperature control can be divided into two camps: precision temperature control, where holding a fixed temperature is critical, and brute-force heat extraction, where the concern is ensuring that the temperature of a device...
Photonics Spectra, June 2005
The Intelligent Node: Video Pan and Tilt Aids Surveillance
The challenge of securing national borders, ports and harbors is increasingly dependent on stabilized, long-range, automated electro-optic surveillance systems. The demand for durable high-resolution electro-optic cameras has skyrocketed, and as a...
Photonics Spectra, June 2005
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