Broadband mirrors
BBHR | 193 nm - 6000 nm

Broadband mirrors (BBHR) are commonly used when it is necessary to reflect two or more wavelengths. While they offer the advantage of reflecting a broad range of wavelengths, this comes with the drawback of lower reflection values compared to 3photon laser line mirrors.
Depending on the required reflection values and range, 3photon engineers design and manufacture broadband mirrors using ion beam sputtering (IBS), electron beam evaporation (EBE), or ion-assisted deposition (IAD) coating technologies.
Angle optimization is also available for normal incidence (0°), 45°, or unique angles such as 22.5°, 56°, 12°, 7°, and others.
Additionally, 3photon can apply broadband mirror (BBHR) coatings to the ends of laser crystal rods.
- Applications
- Substrate
Applications of Broadband Mirrors
- Laser systems require an optical element that reflects two or more wavelengths.
- Scientific experiments.
- Universal mirrors to replace multiple laser line (narrowband) mirrors.
Material
3photon standard broadband mirrors (BBHR) are typically made of ultraviolet-grade fused silica (UVFS, commonly Corning 7980). This material offers excellent properties, enabling polishing to a 10-5 Scratch-Dig quality. Polishing achieves reflected wavefront distortion (irregularity and flatness) values of <λ/10 @ 632.8 nm. For precise and ultraviolet (UV) applications, even higher quality can be achieved. 3photon also offers other materials, such as Schott N-BK7, germanium, calcium fluoride, laser crystals, and others.
Shape, Size and Curvature
Standard 3photon broadband mirrors (BBHR) are typically round, with diameters of Ø25.4 mm or Ø12.7 mm and thicknesses of 6 mm or 3 mm.
However, more complex shapes, such as spherical, cylindrical (convex or concave), and aspherical designs, are available upon request.
3photon engineers are skilled in producing sizes ranging from micro-optics to large optics up to 400 mm in diameter.
Reflection Value
Reflection values depend on the wavelength range. 3photon offers:
- Standard reflection of >99.8% at a 0° angle of incidence, using electron beam evaporation (EBE) or ion-assisted deposition (IAD) technologies.
- High reflection of >99.99% using ion beam sputtering (IBS) technology.
- Note: Achieving high reflection values becomes more challenging as the wavelength range broadens.
Spectral Range
3photon’s optical coating engineers can design broadband mirrors for ranges starting from ultraviolet (UV) at 193 nm, through visible light (400–700 nm), and into the near and far infrared, extending up to 6 µm in some cases.
Angle of Incidence
Broadband mirrors can be designed to perform at various angles of incidence, including ranges of 0–22°, 0–45°, 54–56°, 0–7°, or optimized for a single angle, such as normal incidence (0°), 22.5°, 45°, 56°, and others.
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