Multipass mirror (IMAGE)

Optica

Multipass mirror

Caption

Researchers have developed an extremely sensitive, yet simple optical method for detecting formaldehyde. Their approach is based on multipass spectroscopy, which introduces a laser through a small hole in a mirror. The laser light then bounces back and forth between mirrors, creating interaction lengths with the sample that are tens or hundreds of times the length of the cell.

Credit

Mateusz Winkowski, University of Warsaw

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