Lens Air Gap Measurement: LAS-DMI™

Download LAS-DMI™ Brochure
 
High Accuracy, Quick-Attach, On-Axis Distance Measuring Interferometer (DMI) for LAS™
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Quickly convert your LAS™ into a Distance Measurement Interferometer for on axis metrology of optical systems
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Measures center thickness and air gaps of all optical elements
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Powerful addition to the LAS™ for Lens Manufacturing & Assembly Process Control
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Extensive data reporting functions
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Lenscan™ Software enables straightforward measurements
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Specifications:
High Accuracy Quick-Attach LAS™ Distance Measurement Interferometer Accessory for on-axis metrology of optical systems
Uses Opto Alignment LAS™ precision centering and Fogale Nanotech low-coherence time-domain-scanning interferometry for measuring center thickness and air gaps of all optical elements (lenses, cubes, flats...) of an assembly along the optical axis
Powerful addition to the LAS™ for Lens Manufacturing & Assembly Process Control
Lenscan™ Software enables straightforward measurement procedure with extensive sample setup, definition, and data reporting functions
 
OPERATION:
Light emitted by an infrared SLD is coupled into monomode optical fiber
Light split between measurement arm and reference arm
Light coming back from both arms is directed onto photodetector
When optical lengths of the measurement arm and the reference arm are equal, low-coherence interference is detected on the photo-detector
High stability mechanics along with high resolution encoders and a specific calibration procedure enable high accuracy measurement