Surface figure
Evaluate departure from the agreed reference across the useful aperture. The aperture, support arrangement and measured surface form part of the inspection definition.
Quality, Inspection & Delivery
Laser Interferometer
Evaluate the optical surface across the area that matters.
For a polished glass or fused-silica substrate, we evaluate the specified surface within its useful aperture. The agreed report connects the surface map and PV/RMS values with the support, wavelength and evaluation conditions.
What this measurement resolves
PV and RMS
Report the agreed peak-to-valley and root-mean-square values together with units. When results use fractions of a wavelength, identify the test wavelength.
Comparable results
Record any agreed removal of tilt or other terms, the evaluation mask and relevant test conditions, so a receiving team can interpret the result consistently.
Results you can review
- Surface-figure map
- PV / RMS and test wavelength
- Evaluation aperture and processing notes
Define before measurement
- Surface figure or transmitted wavefront requirement
- Useful aperture, support and reference conditions
- Units, wavelength and permitted data processing
Connect the reported values with the part or witness piece, measurement positions and drawing revision. Include the required records in the order scope. Review delivery records
Measurement notes
Surface figure, transmitted wavefront, roughness and scratch-dig quality are different requirements. A surface-figure result should not be presented as proof of all four.
A common question
What should a flatness requirement include?
State the useful aperture, measured quantity, permitted value, units and test conditions. A wavelength-based limit also needs its reference wavelength.
Complementary checks
3D Optical Profiler
Review local microtopography alongside the overall surface-figure result.
Discuss inspection & delivery
Share the critical acceptance items, required records, quantity and delivery needs. Use your existing drawing for the dimensions already defined.