Optical Mirrors

BK7 Optical Mirrors

High-quality bk7 optical mirrors from PhotonEdge.

Material

N-BK7

Availability

Standard / Custom

BK7 Optical Mirrors

Key Specifications

Substrate MaterialN-BK7 (equivalent to SCHOTT BK7 / K9)
Available Sizes12.7mm - 150mm diameter / square
Thickness3mm - 25mm (standard)
Surface Quality20-10 / 40-20 / 60-40 (MIL-PRF-13830B)
Surface Flatnesslambda/4 (standard) / lambda/10 (precision) @ 632.8nm
Reflectance (Enhanced Al)> 92% across 200nm - 20um
Reflectance (Protected Ag)> 98% across 400nm - 20um
Reflectance (Dielectric HR)> 99.5% - 99.9% at design wavelength
Coating SideFront surface (first surface) reflection

Available specifications vary by material and configuration. Contact engineering for exact capabilities.

What Is BK7 Optical Mirrors?

BK7 optical mirrors are reflective optical components fabricated from N-BK7 glass substrates with high-reflection coatings. BK7 provides excellent surface quality and dimensional stability for visible and near-infrared applications.

When Should You Use This Product?

Use BK7 mirrors when you need cost-effective reflective optics for visible to near-IR systems with moderate power levels. Ideal for beam steering, imaging systems, and laboratory setups where thermal load is not the primary concern.

Available Optical Materials

MaterialAvailabilitySpec Sheet
N-BK7 Standard / Custom See material page

All materials are available in standard and custom thicknesses. Browse all 30+ optical materials →

Optical Coating Options

Anti-Reflection (AR)

Single-layer or multi-layer AR coatings for specific wavelength bands. Reduce reflection to below 0.5% per surface.

High-Reflection (HR)

Dielectric HR coatings for laser mirrors and cavity optics. Reflectivity >99.5% at design wavelength.

Broadband AR

BBAR coatings for wide spectral range applications. Low reflection across 400-700nm or other bands.

Laser Line Coatings

Optimized for specific laser wavelengths: 266nm, 355nm, 532nm, 1064nm, 10.6µm, etc.

Custom Coating

Custom coating designs for unique wavelength ranges, angles of incidence, and polarization requirements.

Engineering Considerations

Wavelength Selection

Material and coating selection must be matched to your operating wavelength band. We can help optimize for single-wavelength or broadband use.

Tolerance Budget

Surface quality, flatness, and centration tolerances directly impact cost. Our engineers can help balance performance requirements with manufacturability.

Thermal Considerations

High-power or wide temperature range applications require careful material selection to minimize thermal lensing and wavefront distortion.

Environmental Durability

For harsh environments, consider material chemical resistance, coating durability, and packaging options. We can provide MIL-spec testing on request.

Applications

Laser Systems

Beam focusing, collimation, and resonator optics for CW and pulsed laser systems.

Machine Vision

High-resolution imaging lenses and illumination optics for inspection systems.

Spectroscopy & Analytical

Precision optics for spectrometers, monochromators, and analytical instruments.

Manufacturing & Customization

30+
Optical Materials
Custom
Sizes & Shapes
ISO 9001
Certified Facility
4-6 wks
Custom Lead Time

Quality Assurance

Every component undergoes comprehensive inspection before shipment. Our quality control process includes:

  • Dimensional verification with calibrated metrology equipment
  • Surface quality inspection per MIL-PRF-13830B standards
  • Coating performance verification with spectrophotometry
  • Centration and wedge angle measurement
  • Cleanroom packaging for critical applications

Learn more about our quality processes →

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Related Knowledge

Application Note

Surface Quality: Scratch-Dig Explained

Understanding MIL-PRF-13830B surface quality specifications and what they mean for your application.

Knowledge Center

Optical Materials Guide

Compare 30+ optical materials by wavelength range, properties, and typical applications.

Engineering Documentation

PDF

BK7 Optical Mirrors - Datasheet

Standard specifications, available options, and ordering information

Request →
DWG

BK7 Optical Mirrors - Drawing Template

Standard drawing with full dimension callouts and tolerance information

Request →
3D

3D CAD Model (STEP)

3D solid model for integration into your optical design software

Request →

Documentation available upon request. Custom specifications require engineering review.

Frequently Asked Questions

What are bk7 optical mirrors used for?

BK7 Optical Mirrors are used in optical systems where precise control of light is required. Common applications include laser systems, imaging, spectroscopy, and scientific instrumentation.

What is the wavelength range?

The usable wavelength range depends on the selected material and coating. Please refer to the material specifications above or contact our engineering team for guidance.

Can I order custom sizes or specifications?

Yes. PhotonEdge offers custom diameters, focal lengths, and coating specifications outside our standard catalog. Custom specifications typically require 4-6 weeks lead time.

What coatings are available?

We offer a range of standard and custom coatings including AR, HR, broadband, and laser-line options. Coating selection depends on your wavelength range and application requirements.

What quality standards do you follow?

Our manufacturing facility is ISO 9001:2015 certified. All components undergo rigorous inspection including dimensional verification, surface quality assessment, and coating performance testing.

Do you provide inspection reports?

Yes. Inspection documentation including dimensional reports, surface quality verification, and coating performance data can be provided according to project requirements.

What is the typical lead time?

Standard catalog components typically ship within 2-4 weeks. Custom specifications require 4-8 weeks depending on complexity. Contact us for expedite options.

How do I request a quote?

Click the 'Request Engineering Quote' button above. Please provide your required specifications, wavelength, coating, surface quality, and quantity for an accurate quotation.

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