Photonics

Hollow-Core Fiber

OFS (Avon, CT) has developed a new Hollowcore Fiber (HCF) as part of the DARPA-funded Compact Ultra Stable Gyro for Absolute Reference (COUGAR) program, led by Honeywell International, Inc. The breakthrough fiber employs an air filled core surrounded by glass webbing. Hollow-core fibers allow light to propagate through free space rather than a solid glass core, making them an ideal waveguide in theory.

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Laser Sensors

Ophir Photonics (North Logan, UT) has announced the newest member of the BeamTrack family, the FL250A-BB-50-PPS. BeamTrack is a unique series of thermal detectors that combine multiple functions in one device: laser power, energy, beam position, and beam size. The sensors also provide information on beam centering and wander, all in a compact unit the size of a single function sensor of the same power level. The first BeamTrack detectors – measuring 3W, 10W, 50W, and 150W – were introduced in 2012.

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CW Laser Diode Driver

A new laser diode driver, iC-HT, from iC Haus (Bodenheim, Germany) permits microcontroller-based activation of laser diodes in CW mode. With this device, laser diodes can be driven by either the optical output power (using APC), the laser diode current (using ACC), or a full, controller-based power control unit. The maximum laser diode current per channel is 750 mA. Both channels can be switched in parallel for particularly high laser diode currents of up to 1.5 A. A current limit can also be configured for each channel.

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High-Power Single-Mode 2.65-μm InGaAsSb/AlInGaAsSb Diode Lasers

This innovation is useful for targeted gas detection instruments in environmental monitoring, safety, quality control, and fundamental science applications. Central to the advancement of both satellite and in-situ science are improvements in continuous-wave and pulsed infrared laser systems coupled with integrated miniaturized optics and electronics, allowing for the use of powerful, single- mode light sources aboard both satellite and unmanned aerial vehicle platforms.

Posted in: Photonics, Briefs

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A Hybrid Fiber/Solid-State Regenerative Amplifier with Tunable Pulse Widths for Satellite Laser Ranging

A fiber/solid-state hybrid seeded regenerative amplifier, capable of achieving high output energy with tunable pulse widths, has been developed for satellite laser ranging applications. The regenerative amplifier cavity uses a pair of Nd:YAG zigzag slabs oriented orthogonally to one another in order to make thermal lensing effects symmetrical and simplify optical correction schemes. The seed laser used is a fibercoupled 1,064-nm narrowband (

Posted in: Physical Sciences, Photonics, Briefs, TSP

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X-Ray Diffractive Optics

X-ray optics were fabricated with the capability of imaging solar x-ray sources with better than 0.1 arcsecond angular resolution, over an order of magnitude finer than is currently possible.

Posted in: Photonics, Briefs

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Optical Device for Converting a Laser Beam Into Two Co-aligned but Oppositely Directed Beams

Optical systems consisting of a series of optical elements require alignment from the input end to the output end. The optical elements can be mirrors, lenses, sources, detectors, or other devices. Complex optical systems are often difficult to align from end-to-end because the alignment beam must be inserted at one end in order for the beam to traverse the entire optical path to the other end. The ends of the optical train may not be easily accessible to the alignment beam.

Posted in: Physical Sciences, Photonics, Briefs, TSP

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