Abstract
Simultaneous measurement of the surface shape and determination of the thickness of a lens were performed using the same optical configuration, utilising temporal localisation and the high peak power of femtosecond optical pulses with two-colour interferometry. Femtosecond two-colour interferometry (FTI) derives good stability in measurements due to the near-common path and easy alignment even though the coherence of the laser is low. The FTI could even be used for in-situ dimensional measurements of complex optical parts with low reflective surfaces and rather tight curvatures.
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