Optical Mirror Mounting: Compare Free-State and Installed Wavefront Results

OPTICS · TECHNICAL INSIGHT

An optical mirror’s free-state flatness report does not describe every installed condition. For a precision assembly, agree how the coated mirror is supported and compare optical results before and after mounting under a controlled test.

Reference and scope

This is an original TUOLAN technical insight supported by the official technical reference linked below. It is not a new product announcement. The application recommendations are TUOLAN’s analysis; supplier examples are not TUOLAN performance guarantees.

Separate the component record from the assembly record

Edmund Optics’s mirror-flatness note discusses how mirror deformation affects reflected wavefronts, including the role of coating stress and reflection geometry. Its examples are design guidance, not a universal test limit.

For precision optical mirror sourcing, request a record for the delivered coated part. Identify clear aperture, measurement wavelength and surface or reflected-wavefront reporting convention. Do not compare results expressed in different conventions without an agreed conversion and test geometry.

Control the installed support

Document the contact pattern, clamp or adhesive method and installation procedure. If a torque-controlled fastener is used, specify its approved setting from the assembly design rather than inventing a generic value.

Use the same specimen for the free-state and mounted checks where practical. Keep measurement aperture and setup consistent, and record changes in focus, pointing or wavefront that are relevant to the application. A difference after mounting is a reason to investigate the support and measurement conditions; it does not automatically prove a faulty coating.

Close the loop after integration

Review mirror coating requirements against the installed angle and polarization. For a thermally changing assembly, define whether testing occurs at a stabilized condition and whether remounting is permitted between measurements.

The acceptance decision should say which performance is required from the loose mirror and which from the completed assembly. Preserve both records and the installation revision. TUOLAN’s role is to review project requirements and supplier evidence, not to claim a standard mounting method will meet every optical budget.

Buyer RFQ checklist

• State whether the report describes surface form or reflected wavefront.
• Document support locations and the controlled installation procedure.
• Compare the same coated sample before and after mounting.

Sources

Official company source, Technical reference; publication date not stated. Reviewed 14 October 2026. Checked on 14 October 2026. Buyer recommendations are TUOLAN’s analysis, separate from the source announcement.

Edited and analysed by TUOLAN TRADE.