Related Experiment Video
Updated: May 13, 2026
A Multimodal Wide-Field Fourier-Transform Raman Microscope
Published on: December 30, 2025
Stroboscopic scanning white light interferometry at 2.7 MHz with 1.6 µm coherence length using a non-phosphor LED
Ville Heikkinen1, Ivan Kassamakov, Tor Paulin
1Department of Physics, University of Helsinki, PO Box 64, 00014 Helsinki, Finland. ville.heikkinen@helsinki.fi
Abstract:
Stroboscopic scanning white light interferometry (SSWLI) allows precise three dimensional (3D) measurements of oscillating samples. Commercial SSWLI devices feature limited pulsing frequency. To address this issue we built a 400-620 nm wideband 150 mW light source whose 1.6 µm wide interferogram is without side peaks. The source combines a non-phosphor white LED with a cyan LED. We measured a calibration artifact with 10 nm precision and obtained 40 nm precision when measuring the 3D profile of a capacitive micromachined ultrasonic transducer membrane operating at 2.72 MHz. This source is compatible with solid state technology.
