analysis test and measurement

Hybrid Mode Optical Monitoring – Benefiting from Monochromatic and Broadband Algorithms in the same Coating Process

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 Broadband monitoring with high signal quality enables use of both broadband and monochromatic layer termination algorithms in the same process when depositing optical interference coatings. Case studies using a bandpass filter and an absorbing layer show how such a “hybrid” approach can lead to the most accurate layer termination.

MarSurf CD

Mahr, a provider of dimensional metrology solutions, has introduced the first in new a line of surface finish and contour measurement systems, the MarSurf contour drive (CD) series

Mission Impossible? Measuring Signals Below the Noise Floor with a Lock-In Amplifier

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Measuring optical signals in the femtowatt (10-15) to nanowatt (10-9) range can be a daunting task. In order to achieve significant improvements in noise rejection we need to turn to a lock-in amplifier, which can improve noise rejection by 3 orders of magnitude or more.

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