Interferometry

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

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

Small but mighty

Professor Emir Salih Magden updates on plans to commercialise an on-chip broadband optical filter

Measure for measure

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

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