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Making Slow Light Go Slower
Mar 1, 2008 — A crucial part of optical signal processing is buffering and storage — sometimes a signal has to wait a while until the system is ready for it. Although this is readily accomplished electronically, it is more of a challenge optically. One approach being explored in many laboratories around the world is to reduce the speed of light; that is, to slow it down until the system is ready to process it. Figure 1. In stimulated Brillouin scattering (SBS), stimulating light creates a sound wave via...
Spectroscopy Can Help Bakers Make Bread
Mar 1, 2008 — When bread dough rises in a small amount of time, the yeast does not produce much carbon dioxide gas, resulting in bread that is too flat and too hard. Longer rise times, however, result in bread that is too fluffy. Bakers currently rely on personal...
Speedy and Colorful Terahertz Scanning
Mar 1, 2008 — When it comes to nondestructive screening and testing, terahertz time-domain spectroscopic imaging offers significant advantages but one considerable drawback. Lying between infrared and microwave wavelengths, terahertz waves can penetrate a wide...
Thermal Sensing with Short-Wave Infrared Detectors
Mar 1, 2008 — Because glass is not transparent at mid- and long-infrared wavelengths, it stops current thermal detectors cold. Consequently, regular glass lenses cannot be used for these thermal imagers, and thermal imagers cannot peer through the window of a...
White Light from a Near-UV Laser Diode
Mar 1, 2008 — Techniques for producing white light from LED methods vary, but most involve mixing blue LED light with yellow phosphor to achieve what the human eye perceives as white. However, the white light is not stable, and its luminous efficacy decreases as...
Optical Tech Topic of Talks
SAN DIEGO, Feb. 15, 2008 -- Getting the most out of limited wireless bandwidth, ratcheting up data rates, new routes on the information superhighway, and a new view of the electromagnetic spectrum are some of the topics that will be covered in research presentations during the...
Optical Tech Topic of Talks
SAN DIEGO, Feb. 15, 2008 -- Getting the most out of limited wireless bandwidth, ratcheting up data rates, new routes on the information superhighway, and a new view of the electromagnetic spectrum are some of the topics that will be covered in research presentations during the...
Pirelli Forms Photonics Group
MILAN, Italy, Feb. 4, 2008 -- The Pirelli Group announced it will form a new company by integrating the photonics work of its Broadband Solutions business with the photonics-related research and development activities of the optical innovation division of Pirelli Labs. The...
A Viable Commercial Alternative to the Ti:Sapphire Laser?
Feb 1, 2008 — The venerable Ti:sapphire laser has always been the workhorse of ultrafast technology, but it is an expensive beast, partly because it requires expensive green pump lasers. Cr3+-doped colquiriites (Cr:LiSAF, Cr:LiSGaF and Cr:LiCAF) also can be...
LEDs Provide Stable Spectroscopic Light Sources
Feb 1, 2008 — To estimate the concentration of various species in plasmas, scientists frequently employ broadband absorption spectroscopy. The xenon arc or deuterium lamps used as light sources in the devices, however, display high spatial and spectral...
Microring Modulator Points to Greater Integration of Electronics and Photonics
Feb 1, 2008 — Although the Mach-Zehnder modulator in the previous report boasts a tiny footprint and avoids the necessity of delicately balancing environmental parameters to maintain a resonance, it requires a hefty, multivolt drive signal that cannot easily be...
Omicron Names Distributor
Feb 1, 2008 — Omicron Laserage Laserprodukte GmbH of Rodgau, Germany, has named its first North American sales representative. Market Tech Inc. of Scotts Valley, Calif., will offer the German company’s range of customized laser systems for medicine, research,...
Photodetector Operates to ~200 nm
Feb 1, 2008 — In semiconductor manufacturing, what is small today will seem large tomorrow, which is true as much for the wavelengths required to make the chips as it is for the devices themselves. Chip makers currently need photodetectors that sense radiation at...
Plastic NIR Photodetector Created with Low Bandgap Polymer
Feb 1, 2008 — Although inorganic photodetectors are finding their way into myriad applications, relatively little has been done with their close cousins, polymer-based near-infrared sensors. Despite a range of potentially valuable uses, such as chemical and...
Q: What Did the Scientist Say to the LED? A: Don’t Be Square
Feb 1, 2008 — A major issue with gallium-nitride LEDs is that, although they efficiently generate short-wavelength photons, the high refractive index of GaN (n = 2.5) traps much of the light inside the semiconductor chip as a result of total internal reflection....
SERS in a Capillary Could Aid Biochemical Sensing on the Lab-on-a-Chip Scale
Feb 1, 2008 — Raman spectroscopy is useful for applications where high-specificity biological or chemical sensing is required. Unfortunately, sensitive detection using Raman-based sensors has proved more difficult, especially at the scale of lab-on-a-chip...
Tiny Mach-Zehnder Modulator Operates at 10 Gb/s
Feb 1, 2008 — Silicon photonics offers the potential of combining the speed and compactness of photonics with the functionality and CMOS fabrication of electronics, a happy combination that may result in vastly more capable computers, communications and consumer...
Using Femtosecond Lasers in Multiplex Spectroscopy
Feb 1, 2008 — When conducting broadband molecular spectroscopy, researchers should use a high-brightness light source to obtain optimum results. Spectrometers used for analysis in the mid-infrared region, especially, should have high sensitivity, resolution and...
VECSEL and Its Pump Laser Monolithically Integrated
Feb 1, 2008 — Compact and efficient green lasers have multiple applications, from laser-projection systems to the fabrication of solar cells and flat-screen displays. Because there are no lasers that emit efficiently in the green spectral region, frequency...
Watching Electrons on the Move
Feb 1, 2008 — Using ultrafast infrared spectroscopy, researchers at Pennsylvania State University in University Park have observed electrons moving in real time through a polymer blend, possibly pointing the way to more efficient organic solar cells. The group...
With a Pulse of Light, Focused Ultrasound Spots Small Cracks
Feb 1, 2008 — What you can’t see can hurt you — at least indirectly. Surface defects and cracks are among the causes of material failures in cars, aircraft and buildings, and they sometimes have a hand in the demise of biomedical and microelectronic devices. The...
Yb-Fiber Laser Is Efficiently Pumped at an Oblique Angle
Feb 1, 2008 — Fiber lasers can be optically pumped by coupling the pump light directly into the fiber core, but because the acceptance angle of the core is relatively narrow, core pumping requires a high-quality — low divergence — pump beam (Figure 1a). Because...
Beckman Coulter Inks Biomedical R&D, Licensing Deals
Jan 22, 2008 — Beckman Coulter Inc. of Fullerton, Calif., a manufacturer of biomedical testing instrument systems, tests and supplies that simplify and automate laboratory processes, announced this week it will launch a four-year, molecular diagnostics...
200 Million More Things to Study
Jan 1, 2008 — Astronomers associated with the Isaac Newton Telescope/Wide-Field Camera Photometric Ha Survey of the Northern Galactic Plane (IPHAS) are seeing red — lots of red. The group has released the first comprehensive optical digital survey of a large...
A Wet Way to Grow Flexible Electronics
Jan 1, 2008 — Although modern electronics often make people move to a beat, the devices themselves can’t budge because they aren’t flexible. There is considerable interest in putting electronics and optoelectronics onto thin plastic substrates, which would make...

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