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Optical Mirrors

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Optical mirrors are precision optics with a highly polished plane or curved surface which reflects light.  At Shanghai Optics we manufacture custom optical mirrors for a wide variety of applications.

Our broadband dielectric mirrors are ideal for demanding applications.  Durable and stable, they perform well with wide spectral ranges (up to 100s of nanometers) and can be used over wide angles of incidence. These mirrors are resistant to environmental or laser damage and are suitable for visible, NIR, and UV light.

Broadband metallic mirrors provide a mix of performance and value, are insensitive to angle of incidence and polarization, and offer high reflection over a broad spectral range.

We also offer high performance ultra-broadband metallic mirrors, where the substrate is coated first with a reflective metal film and then with a dielectric overcoat. Our metallic coatings include aluminum, silver, or gold. Gold is ideal when working in infrared applications, at wavelengths greater than 2 micron, and silver has high reflectance over the visible and near infrared range. For a general purpose visible range, an aluminum coating performs well. This final coating provides protection and enhances reflectivity, and these mirrors are highly durable.

For applications with a specific, narrow wavelength and higher energy levels, we recommend laser line mirrors.  These highly efficient precision mirrors can be used for beam-steering in laser applications. Our laser line mirrors can be customized for your specific laser type or wavelength, and we offer dielectric coatings that can be optimized for high reflectance at your laser wavelength of choice.

Our parabolic mirrors are shaped so as to capture all parallel incoming rays and reflect to a single focal point, or to reflect energy from a single point outwards. They have applications in laser material processing, fluorescence microscopy, high harmonic generation, and for super continuum generation without wave guides.

Custom Optical Mirror Specifications

The performance of an optical mirror depends on the mirror coatings, the optical substrate, surface quality, and the size and shape of the mirror.

Diameter, thickness, and focal length, and radius of curvature are important specifications. Diameter is measured straight on, and the radius of curvature is measured as if the mirror’s curvature was extrapolated into a sphere. The thickness of a mirror is measured in two places: at the center and at the edge.

Focal length is measured as the distance from the mirror to the focal point; the point at which parallel waves converge. For a concave mirror, focal length will be positive; for a convex mirror, negative.

Surface quality is quantified with a scratch-dig number, and the lower the scratch-dig number, the better the surface quality.

The damage threshold of an optical mirror is the highest energy that the mirror can withstand without damage. For instance, if a damage threshold is given as 3.00 J/cm2 (522 nm, 10 ns pulse, 10 Hz, Ø0.803 mm) that optic should be able to withstand energy up to 3.00 J/cm2 at (522 nm, 10 ns pulse, 10 Hz, Ø 0.803 mm). It is important to realize that if optics are not properly cared for, dirt and contamination can lower the damage threshold.

 

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