Optical Mirrors

Dielectric Mirrors

High-reflectivity dielectric coatings for precision wavelength control

Introduction

Dielectric mirrors are optical mirrors that use multilayer dielectric coatings to achieve high reflectivity over a selected wavelength or spectral band. By controlling the thickness and refractive index of individual coating layers, these mirrors can be engineered for specific operating wavelengths, angles of incidence, and polarization conditions.

Compared with broadband metallic mirrors, dielectric designs provide more selective spectral control and can deliver very high reflectivity with low absorption within the designed range. This makes them especially suitable for laser systems and other optical assemblies where coating performance must be closely matched to the operating wavelength and beam conditions.

Applications

  • Laser resonators and cavities
  • High-power laser beam delivery
  • Ultrafast laser systems

Features & advantages

  • High optical efficiency in wavelength-specific designs
  • High laser damage resistance for demanding beam conditions
  • Consistent performance under defined incidence and polarization conditions
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Product specifications

Specification Options
Mirror Type Dielectric mirror
Substrate N-BK7 / fused silica
Dimensions (mm) Custom sizes available
Dimensional Tolerance (mm) ±0.10 typical, tighter options available
Coating Type Broadband / Laser-line dielectric coatings
Reflectivity >98% typical, higher options available
Wavelength Range UV / Visible / NIR / IR, coating dependent
Angle of Incidence 0° – 45° typical
Polarization S / P / Unpolarized
Surface Quality 60/40 S/D– 20/10 S/D available
Surface Flatness λ/2 – λ/10 @ 632.8 nm
Laser Damage Threshold Design and wavelength dependent

Specifications represent typical capabilities for dielectric mirrors. Final parameters are confirmed according to specific optical and coating requirements.

Technical capabilities & processing options

  • Multilayer Dielectric Coating Design:
    Coating structures can be optimized for specific wavelength ranges, reflectivity targets, and optical system requirements.
  • Wavelength and Bandwidth Control:
    Layer thickness and coating process control support precise spectral positioning and consistent high-reflectivity performance.
  • Angle and Polarization Optimization:
    Dielectric mirror designs can be adapted for defined angles of incidence and polarization states to maintain the required reflection characteristics.
  • Spectral and Optical Inspection:
    Reflectance, spectral bandwidth, surface quality, and coating consistency can be verified according to project requirements.

Need a Custom Dielectric Mirror?

Share your wavelength range, reflectivity, angle of incidence, and mirror dimensions. Our team can review coating design, polarization conditions, and surface specifications for your project.

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