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NIST Symposium Reports Advances in Fiber Optic Measurements
In the even-numbered years since 1980, optoelectronics metrologists have met in Boulder, Colo., for the Symposium on Optical Fiber Measurements (SOFM). Representing industry, academe and government, the participants report on measurement advances and promote the use of the best practices and standardized measurements. SOFM 2004 took place Sept. 28 to 30 and was hosted by the National Institute of Standards and Technology’s (NIST) Optoelectronics Div. in Boulder, in cooperation with the...
Photonics Spectra, January 2005
Optimizing and Stabilizing Diode Laser Spectral Parameters
The stated goal of the Super High Efficiency Diode Sources (SHEDS) program is to develop superefficient diode lasers, which, in turn, will lead to efficient, high-power solid-state lasers. The missing link between these two goals is the spectral...
Photonics Spectra, January 2005
Radically Asymmetric Wavelength-Stabilized Lasers Reduce Loss
As part of our ongoing involvement in the development of potentially industry-changing advanced technology, we at JDS Uniphase Corp. have been working since January 2004 on the Defense Advanced Research Projects Agency’s Super High Efficiency Diode...
Photonics Spectra, January 2005
Semiconductor Light Sources Move from the IR to the Visible and UV
For years, semiconductor technologies have dominated applications of light sources in the infrared region. For example, fiber communications makes use of light in the mid-IR range (1700 to 980 nm), and CDs and DVDs use light in the near-IR to deep...
Photonics Spectra, January 2005
Single-Frequency Fiber Lasers
Optoelectronics and fiber optics technology experienced significant advances in the 1990s, driven largely by well-funded innovation in the telecommunications, semiconductor and consumer electronics sectors. Although some of these sectors have since...
Photonics Spectra, January 2005
Smaller, Cheaper, Better: Photo ICs Come of Age
A current trend in the optical detector industry involves the need for photodetectors that feature added capabilities. It used to be the case that the most efficient setup was a simple photodiode mounted on a PC board and a discrete amplifier, but...
Photonics Spectra, January 2005
Technology Trends for Digital Cameras
Two trends are at work as automated visual inspection systems continue their rapid progress. First, it is demanded that smaller features be inspected on larger targets. Representative applications include the scrutiny of the manufacturing processes...
Photonics Spectra, January 2005
Transverse Bragg Resonance Lasers: A New Approach to Mode Control in Semiconductor Lasers
In the pursuit of a large-area, high-power diode laser that maintains efficient single-mode operation, we have proposed a device that lases in a fundamentally different manner, the transverse Bragg resonance mode. To date, our work has focused on...
Photonics Spectra, January 2005
'Wiring' Light with Femtosecond Laser Pulses
Shortly after the invention of the laser, researchers discovered that intense laser pulses can cause dielectric breakdown and structural change in materials. This generally was considered a nuisance, hindering both research and the development of...
Photonics Spectra, December 2004
Approaches Aim to Unmask Semiconductors
When Walt Trybula looks at the future of semiconductor manufacturing, he sees problems. Such foresight is part of his job as a senior fellow at the Austin, Texas-based semiconductor research consortium Sematech. Besides looking forward to spot...
Photonics Spectra, December 2004
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
Gigabit Ethernet Finds a Foothold in High-Performance Vision
Real-time operation is a requirement for most high-performance vision applications, including destructive testing, postal sorting, security and surveillance, and the inspection of electronics gear such as flat panel displays, semiconductors and...
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
Polycrystalline GermaniumEnables Near-IR Photodetectors Integrated with Silicon CMOS Electronics
In the past two decades, SiGe has been the material of choice for the development of near-IR (0.7 to 2 µm) optoelectronic devices based on silicon, and several groups have developed high-performance near-IR photodetectors on Si substrates.1...
Photonics Spectra, December 2004
Advances in Optical Device Simulation Software
Simulation software is a well-known tool that can dramatically speed up product engineering and development. In recent years, technology computer-aided design (TCAD) has been put to use in the development of semiconductor optoelectronic devices such...
Photonics Spectra, November 2004
Automated Positioning Meets Microspectrophotometry
The number of manufacturing applications where spectral analysis of minute samples or areas is required is on the rise. To meet the demands of high throughput and precision, many companies, educational institutions and government agencies are...
Photonics Spectra, November 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
Finding the Missing Link for High-Power Fiber Lasers
Despite their record performance, high-power fiber lasers have made little progress in penetrating the marketplace. Fiber lasers must become cost-competitive if they are to replace the existing technologies, and they must be robust and durable....
Photonics Spectra, November 2004
Monolithic Optics Enable Next-Generation Designs
The traditional design paradigm that optical and optomechanical engineers use to develop optical assemblies is fairly straightforward and compartmentalized. It starts with the optical design of a series of discrete optics in free space, then...
Photonics Spectra, November 2004
Optically In-Well-Pumped VECSELs: An Attractive New Source in the Near-IR
Think fast: If you needed a wavelength-tunable laser with good beam quality in the near-infrared, what would you choose? A Ti:sapphire or a dye laser probably immediately springs to mind, but each has its drawbacks. For example, Ti:sapphire...
Photonics Spectra, November 2004
Riding a New Speedy Bus for Image Acquisition
First the balloon popped, and then the eyes did. All the audience had seen was the balloon, full of water, disappear, to be replaced in an instant by red rubbery fragments and a splash. The sequence of events, however, had been captured at hundreds...
Photonics Spectra, November 2004
Thin Films Sing a New Tune
The growth of wavelength division multiplexing (WDM) fiber optic networks greatly accelerated the demand for tunability in components such as optical channel monitors, add/drop data filters, lasers and receivers. As a result, virtually every type of...
Photonics Spectra, November 2004
Automation Advances Life Sciences Microscopy
Automated microscopy in the life sciences can trace its beginnings to the semiconductor industry. In the 1970s, automated microscope stages were developed and used extensively for wafer inspection in semiconductor fabrication. By grafting motorized...
Photonics Spectra, October 2004
Better Illumination Design Through Automated Optimization
Light pipes couple and shape light-source output distribution in a variety of illumination applications, including automotive and avionic displays, fiber optic illuminators and display backlights. Traditionally, successful design of these systems...
Photonics Spectra, October 2004
High-Power Pulsed Laser Diodes Take on New Industrial and Commercial Applications
The ability of pulsed laser diodes to provide short pulses of intense power has made them an ideal choice for military applications such as target designating and rangefinding. Indeed, much of the historical motivation for developing these diodes...
Photonics Spectra, October 2004
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