Interferometry

The nulling interferometry devices under development at Caltech’s Exoplanet Technology Laboratory cancel out starlight to help detect and identify foreign worlds. (Credit: Shutterstock/Dotted Yeti)

Emerging astrophotonics technologies

Nemanja Jovanovic, lead instrument scientist at Caltech’s Optical Observatory and Exoplanet Technology Laboratory, on emerging astrophotonic technologies on his radar

Preliminary testing of the quantum gravity gradiometer designed by Michael Holynski and colleagues at the University of Birmingham, which has now been shown to locate an underground tunnel with a positional accuracy of 20cm. Credit: Crown Copyright

Underground quantum sensing set to erupt

Susan Curtis explores the new breed of quantum gravimeters finding their way onto the slopes of Mount Etna and into tunnels deep under Birmingham

A 2 x 2mm integrated photonic chip will make interferometers, and therefore precision optics, even more powerful. Credit: J Adam Fenster/University of Rochester

Researchers amplify interferometric signals on photonic chip

University of Rochester researchers have packaged a way of amplifying interferometric signals using inverse weak value amplification - without increase in extraneous input or 'noise' - on an integrated photonic chip

Broadband pump-probe spectroscopy at MHz modulation frequency

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The GEMINI interferometer enables an innovative approach to broadband pump-probe spectroscopy. Thanks to the employed time-domain Fourier Transform (FT) detection system, this configuration permits the measurement of the broadband pump-probe signal with a single-pixel detector and a single-channel lock in amplifier. In this way, it's possible to combine an ultra-broad spectral coverage with an extremely high sensitivity

Atria OCT swept source

Thorlabs has expanded its swept source OCT (SS-OCT) offering with the release of Atria systems centred at 1,060nm

In deflectometry, a camera images fringe patterns that have reflected off a surface under test, so that a system can deduce a map of the surface slopes from the deviation of the projected fringes, and from that determine the surface shape. Credit: Mahr

Getting the measure of aspheric and freeform lenses

Lens features have been getting too small to properly characterise – but metrology providers are catching up, finds Andy Extance

L to R: Marc Canales, Roger Artigas, EPIC’s Ana González & Carlos Lee

Made to measure

Jose Pozo, CTO at EPIC, talks with Roger Artigas, co-founder, president and CTO of Sensofar Metrology – a designer and manufacturer of 3D surface metrology instruments

Measure for measure

Keely Portway looks at some of the latest advances in light-based test and measurement techniques

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