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D-shaped Pickoff Mirror, Ø25.4 mm, Broadband Dielectric, 488-694 nm
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D-shaped Pickoff Mirror, Ø25.4 mm, Broadband Dielectric, 700-950 nm
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The Ideal Choice for Beam Pickoff Applications

The reflective coating of D-shaped mirrors extends to near the flat edge of the mirror, enabling the separation of closely spaced optical beams. An example application is a folded geometry prism compressor used to shorten the duration of a positively chirped ultrashort laser pulse. As the image shows, the beam entering the prism assemblies passes slightly above the D-shaped mirror. The beam exiting the prism assemblies travels slightly below, and in the same vertical plane as the entering beam, but is then "picked off" by the D-shaped mirror and routed to an autocorrelator. A D-shaped mirror improves the efficiency of such a prism compressor because it enables the entering and exiting beams to be placed much closer to each other than a round mirror would allow. For more information, see our Prism Compressor for Ultrashort Laser Pulses application note.

Fused Silica Substrates

Fused Silica is synthetic amorphous silicon dioxide of extremely high purity. This non-crystalline, colorless silica glass combines a low content of inclusions with high refractive index homogeneity, a very low thermal expansion coefficient, and excellent transmittance in the wavelength regime from UV to NIR. As a result, these mirrors will perform better with temperature fluctuations and is ideal for high-energy laser applications due to its high energy damage threshold. For more information, please see our Optical Materials technical note.

Durable Dielectric Coatings

All dielectric coating construction is physically more durable than standard metallic coatings. Dielectric mirrors are more resistant to humidity, thermal changes, abrasion and salt exposure.

Visible Broadband Dielectric Coating

Our BD.1 visible broadband dielectric coating reflects all visible wavelengths from 488 to 694 nm with greater than 99% efficiency for s-polarization, and 98% for p-polarization, at 0 - 45° angle of incidence. High reflectivity is also extended to greater than 98% for 441.6 nm.

NIR Broadband Dielectric Coating

Our BD.2 coating offers high reflectance for near infrared diode laser applications. Reflectivity is greater than 99% for s-polarization, and 97% for p-polarization, for wavelengths between 700 – 950 nm at 0 – 45° angle of incidence.

Pick Off Tightly Spaced Beams

The coating is applied all the way to the sharp edge of the mirror. This allows for scientists to pick off very closely aligned beams. Please beware that the edge is sharp and can be easily chipped if not handled with care.

Extremely Versatile

D-shaped mirrors are used in a variety of applications such as pump probe spectroscopy, prism compressor systems, applications where the beam is folded back upon itself, or those combining multiple beams.

Special Handling Required

As the reflective coating extends to near the flat edge of the mirror for pickoff applications, the flat edge is cut very sharp with no bevel. Thus, special care should be taken when handling to avoid injury. Furthermore, other contact with the flat edge should be avoided as much as possible to prevent the mirror from becoming chipped, including mounting in standard mirror mounts. Newport recommends HM-1 or M1-1D Edge Grip mirror mounts for all d-shaped mirrors.