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TEST & MEASUREMENT FEATURES
Beam Profiling Evolves to Keep Lasers in Line with New Applications JOEL P. WILLIAMS, ASSOCIATE EDITOR Lasers provide many different industries with greater efficiency, less waste, and higher precision, but they are not always as easy to fix as the machines they replace. A blunted drill bit is easier to observe and replace than an underperforming laser beam is to detect and correct. Fortunately, as laser technology has evolved, so have a variety of technologies that measure, monitor, and help to optimize the power, shape, and energy of a laser beam.
Photonics Spectra, Jan 2023
STEM Programs Struggle to Satisfy the ‘Endless Demand’ for Photonics Talent Jun 29, 2022 — Earlier this year, at a major recruitment event at the University of Arizona’s Wyant College of Optical Sciences (OSC), the job openings listed outnumbered students in attendance. This imbalance exemplifies the immense pressure STEM programs...
Photonics Spectra, Aug 2022
Single-Photon Avalanche Diodes Sharpen Spatial and Temporal Resolution Mar 31, 2022 — As their name implies, single-photon avalanche diodes (SPADs) detect single particles of light, and they do so with picosecond precision. Single-pixel SPADs have found wide use in astronomy, flow cytometry, fluorescence lifetime imaging microscopy...
Photonics Spectra, May 2022
The Pandemic Is Driving Innovative Microfluidic Disease Detection Jan 6, 2022 — As medicine and the monitoring of health have advanced into the modern era, researchers and clinicians have sought to capture an ever-increasing number of the biomarkers that are carried in biofluids, especially in biofluids such as blood and saliva...
BioPhotonics, Apr 2022
How Single-Photon Detection Powers Countless Applications Dec 29, 2021 — The technologies we use in our everyday activities to monitor the world around us — to develop new medicines or to produce the materials we use to build homes, offices, and factories — all rely on the most precise measurements of key parameters...
Photonics Spectra, Feb 2022
Fiber Optic Sensors Are Wired for Growth with Infrastructure Improvements Dec 3, 2021 — In October 2021, a 40-year-old undersea pipeline off the coast of California ruptured, releasing more than 130,000 gallons of crude oil into the Pacific Ocean. The spill polluted the ecosystem, stifled local economic activities such as fishing and...
Photonics Spectra, Jan 2022
Optical Surface Analysis: Focusing on the Fundamentals Aug 30, 2021 — Today’s instruments for measuring optical components deliver increasingly higher resolution, larger measurement areas, and greater analysis functions. In addition to improving results, the added sensitivity and analysis options can also...
Photonics Spectra, Oct 2021
Inspecting for Lens Defects Only Scratches the Surface Jul 29, 2021 — It may come as a surprise to learn that, in sharp contrast to the high-precision practices of the optics industry, many optical surfaces are still inspected by the naked eye. Humans have yet to be usurped by automation, in this niche at least, but...
Photonics Spectra, Sep 2021
Beam Profiling: What Is Your Laser Not Telling You? May 4, 2021 — While it may seem intuitive that turning up the power on a laser will produce faster results in a materials processing operation, beam measurement tools often reveal that this only distributes the laser’s energy over a larger area, resulting...
Photonics Spectra, Jun 2021
Smart Probe Captures Biomarker Sequence Apr 15, 2021 — A smart probe is a hairpin oligonucleotide, essentially a string of nucleic acids, that is labeled with a fluorophore on one end and tethered with successive guanosine residues on the other end. Extrinsic dye labels with suitable absorption are...
BioPhotonics, Jun 2021
Plasmonics and Microfluidics Speed Detection of Lyme Disease Apr 5, 2021 — When a person develops Lyme disease from a tick bite, identifying the tiny culprit can be challenging. The insect itself is difficult to see in the grass or forested area it comes from before burrowing into the person’s skin. The symptoms of...
BioPhotonics, Jun 2021
Liquid Crystal Sensors Provide Rapid COVID-19 Diagnosis Mar 23, 2021 — The global outbreak of COVID-19 has prompted scientists worldwide to focus their research on the virus over the last year, particularly those who work with optical and sensing technologies. Some have concentrated on understanding fundamental aspects...
BioPhotonics, Aug 2021
Growth in OLED Lighting Demands New Metrological Traceability Dec 31, 2020 — The increasingly broad transi­tion from incandescent light bulbs to OLEDs for general lighting poses new challenges to light measurement. OLEDs exhibit completely different and far greater variations in their spectral distribution. This variability...
Photonics Spectra, Feb 2021
Spectroscopy Takes Root in Agricultural Analysis Dec 29, 2020 — Technical advancements have dramatically changed the processes that people use when farming. For example, to ensure optimal crop placement and fertilization, optical sensing techniques provide finely detailed analysis of local soil characteristics...
BioPhotonics, Apr 2021
Mobile Spectroscopy Enables Noninvasive Blood Hemoglobin Assessments Dec 14, 2020 — As one of the most routinely performed laboratory tests, a blood hemoglobin test is used to measure levels of the oxygen-carrying protein in the blood. Potentially reduced levels are commonly associated with certain conditions. Clinics order the...
BioPhotonics, Feb 2021
Achieving Improved Signal-to-Noise Ratio in Flow Cytometry Jun 15, 2020 — Flow cytometry explores, analyzes, counts, and sorts small particles. With the increasing demands for higher data quality from researchers, clinicians, and manufacturers, component builders for these systems are being driven to increase the...
BioPhotonics, Aug 2020
Measuring High-Power Materials Processing Lasers with Camera-Based Beam Profilers Jun 1, 2020 — From cutting steel to drilling via holes in silicon to marking plastic, a wide range of materials processes now use high-power lasers. Ever-growing demands for increased productivity and reduced waste require that the laser process be stable and...
Photonics Spectra, Jul 2020
For Carmakers, Inspection Flexibility Makes the Difference Jul 11, 2019 — Building a car is a complex process, and it’s getting more complex every year. There are thousands of parts to inspect for quality and conformance to ever tighter specifications. What’s more, these parts must be tracked, and variations...
Vision Spectra, Sep 2019
LASER World of PHOTONICS 2019: An Innovation Playground Apr 10, 2019 — With a first-rate portfolio, LASER World of PHOTONICS (Laser Munich) is a one-stop shop for research and technology, industry, and academia — showcasing numerous photonics components, systems, and applications. The biennial conference and...
BioPhotonics, Jun 2019
A Closer Look at Resolution Testing Feb 4, 2019 — In the days of VGA video cameras and predominantly analog storage, it was easy to make an imaging lens that would outperform the camera’s ability to capture an image. That’s no longer the case. Where 640 pixels once stood, it is not...
Vision Spectra, Mar 2019
Designing Large Fizeau Interferometers Jan 29, 2019 — Laser Fizeau interferometers are the workhorses of optical testing. With proper configurations and accessories, these instruments enable characterization of flats, prisms, concave and convex lenses, and even aspheric elements. While many laser...
Photonics Spectra, Mar 2019
Measuring NIR Sources for Safe and Accurate 3D Sensing Jan 16, 2019 — 3D sensing with NIR wavelengths has taken off in the past several years, with use in such applications as facial and gesture recognition, eye tracking, and automotive vision systems such as lidar. The market for these optical sensing systems is...
Photonics Spectra, Mar 2019
Vision Systems for 3D Measurement Require Care to Ensure Alignment Jun 1, 2018 — Calibration, pointing accuracy, and repeatability are critical to the success of vision systems for measurement. This is especially true for precise 3D multicamera measurement applications where single-pixel measurements are needed to help machine...
Vision-Spectra.com, Jun 2018
Scatter and BSDF Measurements: Theory and Practice Feb 7, 2018 — Understanding the fundamental characteristics of scatter and the limitations imposed by scatterometers is essential to performing meaningful stray light calculations.
Photonics Handbook, Mar 2009
Innovations in Lens Measurement Jan 29, 2018 — Automobile cameras, telescopes, head-mounted displays, laser-focusing heads and other modern photonic devices incorporate high-grade optics that can perform under extreme environmental conditions. The demand for such lenses means they must be...
Photonics Spectra, Mar 2018
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