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Photonics Spectra Preview - July 2022

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Here is your first look at the editorial content for the upcoming July issue of Photonics Spectra.





VCSELS

The global market for VCSELs continues to grow rapidly, fueled largely by demand from 3D sensing applications embedded in mobile phones and other consumer devices as well as in automotive lidar and ADAS technology. Contributing author Hank Hogan examines how the application demands in these various 3D sensing systems are shaping VCSEL performance properties, such as beam quality, wavelength, and output power as well as the cost for both discrete and arrayed sources.

Key Technologies: VCSELs, edge-emitting diodes, long/short range lidar, gesture recognition, 3D sensing, CMOS sensors

Cooled Imagers

After much anticipation, the James Webb Space Telescope is in place, finishing its calibrations, and getting down to the business of probing the structures and origins of our universe. Central to its mission is the Mid-Infrared Instrument, which comprises three passively cooled detectors and a fourth that required an exquisitely engineered cooler to minimize vibration, power consumption, and thermal signals from the detector’s electronics. Contributing editor James Schlett takes readers on a virtual tour of the MIRI's developmental journey and current functionality with insights from the team who designed it.

Key Technologies: Thermal management and active cooling systems (especially for imagers), MIR/SWIR sensors and cameras.

Fiber Sensors

Given their EMI immunity, intrinsic safety, small size & weight, autoclave compatibility, and the capability to perform multi-point and multi-parameter sensing remotely, optical fibers and fiber-based sensors are seeing increased adoption for a variety of biomedical applications — ranging from diverse endoscopes to laser delivery systems, to disposable blood gas sensors, to intra-aortic pressure sensing probes. Alexis Mendez of MCH Engineering updates readers.

Key Technologies: Optical fibers, fiber sensors, and fiber components, such as Fabry-Perot interferometers, fiber Bragg gratings. Also, downstream implementations in OCT, confocal microscopy, photoacoustic imaging.

Simulation Software

This article describes the value and application of simulation software to model and solve design challenges for terahertz spectroscopy components.

Key Technologies: simulation software, THz spectroscopy

Laser Diode Lighting

Laser diode-powered lighting has become well-established in applications demanding very high-intensity lighting, such as architectural illumination, surgical lamps, spot and rescue lighting, and cinema projection. Meanwhile, fabricators continue to optimize their systems to lower costs and make the technology more competitive in still emerging markets, such as automotive headlamps. Ohio University's Faiz Raiman updates readers on developments in phosphors, laser diode pumps, and thermal management to scope out how this technology will continue to evolve.

Key Technologies: Diode laser-based light sources, lenses, mirrors, phosphors, heat sinks, power/control electronics.

Laser Safety

An institution's ability to accurately report and quantify laser-related accidents depends on how it defines "laser-related" and "accident." Veteran laser safety officer Ken Barat discusses the standard definitions already implemented, and how they might apply to readers' organizations.

Key Technologies: Laser safety interlocks, shutters, glasses

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