Optical metrology

Figure 1: The slow optical cooking setup: A silica microfibre filled with deionised water is coupled to two microfibers, MF1 and MF2, which are oriented perpendicular to the microfibre and connected to an optical spectrum analyser and broadband light source. The heating effect caused by the broadband WGMs is illustrated in red.

Breaking the boundaries of precision in optical microresonator fabrication

Researchers are unlocking an exciting field of photonics development with optical microresonators fabricated at higher precisions than ever before

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

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