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Features

As comedian Steve Martin urged in his now-classic stand-up routine: "Let’s get small." The point has not been lost on semiconductor laser physics. While the work is largely confined to university and government research labs, advances in materials science should enable the development of unique commercial laser products in the near term. Quantum dots, nanometer-size semiconductor particles, promise to enable laser diodes with higher powers, greater temperature stability, lower threshold...

Photonics Spectra, July 2001

Little Lenses, Major Markets

Innovation comes about when either a technological advance finds a profitable market or a market need drives a technological advance. In the case of small lenses, a good mixture of both of these forces has created a large microlens industry over the...

Photonics Spectra, July 2001

Photonics Design and Solutions

We, as polishers, are constantly pursuing the perfect surface. We want it flat -- very flat -- and we want it smooth -- very smooth. But what does that really mean? Is root mean square (rms) surface roughness the answer? We can take rms readings to...

Photonics Spectra, July 2001

Size and Spectrum

Photonics is increasingly influencing our lives, even if many people do not realize it. For example, fields such as semiconductor, chemical, food and color analysis; light source and pollution measurement; medical diagnostics; and telecommunications...

Photonics Spectra, July 2001

Staff Report: Growing by Design

Anybody who has blasted music from a cranked-up stereo system is probably familiar with the hiss emitting from the speakers between songs. The sound, which comes from the amplifier electronics, is usually forgotten with the first chords of the next...

Photonics Spectra, July 2001

Technology Close-Up

What do inspection machines, camera strobes, airplanes, operating rooms, lasers, extraterrestrials and Broadway stages have in common? They need high-intensity lighting. Xenon lamps have found their way into all of these applications -- except maybe...

Photonics Spectra, July 2001

CLEO Show Highlights

True to its name, the 2001 Conference on Lasers and Electro-Optics in Baltimore showcased the latest in laser technology. Most of the new technology on the conference's exhibit floor emphasized diode-pumped, solid-state sources, several operating in...

Photonics Spectra, June 2001

Design & Solutions

Modern communications system providers are striving to increase the capacity of their networks to satisfy the rapidly growing exchange of information around the world. Raising the data rate of a single-wavelength channel is one way to increase the...

Photonics Spectra, June 2001

Keep It Together

Photonic components such as multiplexers, carrier and pump lasers, and attenuators are designed to fit within a network and survive up to 20 years. Companies incur heavy costs when they replace components that have failed in the field. These...

Photonics Spectra, June 2001

Monitoring the Process

To meet the goal of an efficient laser-driven manufacturing process, the laser must deliver the correct amount of energy, correctly distributed over the target area. Users demand both predictable and repeatable operation results to ensure that the...

Photonics Spectra, June 2001

Photonics News Flash

The flashes lasted too long to be gunfire. And the videotapes that the public saw on the evening news were copies that had been altered by an unidentified technician in some TV studio who probably added the sound of gunshots to make the broadcasts...

Photonics Spectra, June 2001

Photonics Pointers

You are designing a product that incorporates a high-power laser diode. Do you need a custom design? What are the costs and technical issues involved in customizing diodes? Where do you start? Product designers can make the process faster, perhaps...

Photonics Spectra, June 2001

Technology Close-Up

Color is a visual cue that we often use to make judgments about our surroundings: Is an apple ripe? A steak fresh? Does this jacket match those pants? For this reason, manufacturers go to a lot of trouble to ensure that a package's colors remain...

Photonics Spectra, June 2001

The Automation Crisis

Physics is all that stands between Intel and photonics. Intel knows volume manufacturing, it knows how to integrate many functions on one chip, and it knows that communications is a significant growth market. So why didn’t the massive chip...

Photonics Spectra, June 2001

'Wireless' Meets Photonics

Optical communication offers considerable growth potential to the continuously increasing useful transmitted data rate demand. Constellations of communications satellites will benefit from the ability to transmit the ever-higher data rates with...

Photonics Spectra, May 2001

A Little Enlightenment

When automated inspection became a viable process, engineers concentrated on the camera and optics, the algorithms, the interface hardware and the processor. Only rarely did they pay attention to the lighting system or lighting approach. As...

Photonics Spectra, May 2001

Chameleon Lasers

Cell biologists have long used wavelength discrimination to optically map structure and function at the cellular and subcellular level. The advent of the confocal laser scanning microscope has enabled such observations in three dimensions, close to...

Photonics Spectra, May 2001

Efficiency Experts

For almost a decade, the laser industry has labored to produce a compact, reliable semiconductor-based laser that emits a blue beam. It is a tale replete with exotic design schemes, from upconversion fiber lasers to waveguide or resonantly doubled...

Photonics Spectra, May 2001

Future-Proofing Defense

The new political administration wants to transform America's defense structure from a Cold War fighting force into a high-tech, futuristic military. But deciding which weapons programs will receive a boost in funding and which a cut – and then...

Photonics Spectra, May 2001

Keeping Up with the LEDs

Light-emitting diodes (LEDs) appear to be everywhere these days. They are used in internal and external automotive lighting applications, traffic lights and some information display systems. But these LEDs are really quasimonochromatic light sources...

Photonics Spectra, May 2001

Laboratories Turn to Photonics

In last year's look at the laboratory market, bench scientists emphasized the need for greater sensitivity, power and throughput, to the exclusion of such trifling considerations as price. To some degree, and for certain applications, this...

Photonics Spectra, May 2001

Light Technology, Heavy Manufacturing

At KLA-Tencor Corp. of San Jose, Calif., the emphasis is on the detection and measurement of small things, items with dimensions of less than a micron. The company makes yield management and process control solutions for the semiconductor...

Photonics Spectra, May 2001

That's Entertainment

The recent establishment of the Purdue International Center for Entertainment Technology at Purdue University in West Lafayette, Ind., is a formal acknowledgment of entertainment as a vibrant innovation sector. The center will bring researchers and...

Photonics Spectra, May 2001

Tools to Beat the Bandwidth

The demand for more bandwidth has undergone something analogous to chromatic dispersion: Its original message has changed shape over time. Perhaps because of the simplified format of marketing and media or the bottom-line mentality of...

Photonics Spectra, May 2001

UV Laser Safely Cleans Historical Glass

Historical glass can suffer a tremendous loss of transparency from atmospheric or biogenic corrosion resulting from long-term exposure to air pollutants and humidity (Figure 1). Surface layers and deposits can present serious obstacles to efforts to...

Photonics Spectra, May 2001

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