Optical and Mechanical Specification

Substrate: UV Fused Silica

• Diameter tolerance: +0 / −0.25 mm
• Thickness tolerance: ±0.25 mm.
• Front surface flatness: λ/10
• Surface roughness: <0.8nm RMS
• Front surface quality: 10-5 scratch dig
• Rear surface: inspection polish.
• Reflectivity: Greater than 99.7 percent at the specified wavelength.

Surface flatness is verified after coating using interferometric measurement, to confirm coating stress has not degraded figure.

Laser Induced Damage Threshold, LIDT

We characterise laser induced damage threshold performance according to wavelength and pulse regime.

• Test wavelength: 1064nm.
• Pulse duration: 10 ns.
• Test protocol: S-on-1, ISO 21254.
• Measured LIDT: 35 J per cm² at 10 Hz.

Full test methodology and data are available during technical evaluation.

Standard Wavelengths

High reflectivity dielectric coatings are available at:

• 248 nm
• 266 nm
• 355 nm
• 532 nm
• 1030 nm
• 1064 nm

Reflectance curves are available for each wavelength.

Other wavelengths available on request.

Standard Dimensions and Part Numbers

Retain full part number table exactly as currently structured.

Other sizes and specifications are available on request.

Coating Architecture and Process Control

These mirrors use dielectric multilayer HR coatings optimised for 0° incidence.

Coating deposition process: MPO offers electron beam gun or ion-IAD (ion assisted deposition)

Process monitoring ensures layer thickness control and repeatability.

Metrology and Inspection

We verify the component performance through structured inspection procedures:

• Interferometric surface figure measurement, using a 6” and 18” interferometer.
• Surface quality inspection to 10-5 scratch dig
• Reflectivity measurement using calibrated spectrophotometers.
• Batch traceability reference: (every coating run has a witness piece and a spectral curve report to indicate performance.)

Inspection reports can be supplied for qualification and procurement review.

Manufacturing Control and Repeatability

At MPO we manufacture our optics within a controlled production environment with documented procedures covering:

• Substrate preparation
• Precision polishing
• Cleaning and contamination control
• Coating deposition
• Post coating inspection
• Batch identification and traceability are maintained, supporting repeatable supply for OEM and research programmes.

Typical production lead times vary from one week for standard off-the shelf products to eight weeks for custom mirrors, dependent on specification and quantity.

Custom Solutions

We offer custom configurations are available, including:

• Alternative diameters and thicknesses
• Custom wavelengths
• Application specific reflectivity targets
• Enhanced flatness tolerances up to Lambda/20
• Integration into larger optical assemblies

For programme level or high energy applications, detailed documentation and performance data can be reviewed under NDA.