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Chirped Mirror Pair, Ultrafast, 25.4 mm, 700-890 nm
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  • Wavelength Range
    700-890 nm
  • Diameter
    25.4 mm
  • Material
    Fused Silica
  • Coating Type
    Broadband Dielectric
  • Surface Quality
    10-5 scratch-dig
  • Surface Flatness
    λ/10 at 632.8 nm
  • Wedge
    <10 arc min
  • Angle of Incidence
    0-10° (s pol), 0-15° (p pol)
  • Clear Aperture
    ≥ central 80% of diameter
  • Back Surface
    Commercial Polished
  • Reflectivity
    R>99.5% per bounce
  • Thickness
    10 mm
  • Thickness Tolerance
    +0/-0.2 mm
  • Diameter Tolerance
    +0/-0.1 mm
  • Chamfers
    0.3 ± 0.2 mm face width
  • Chamfers Angle Tolerance
    45° ±15°


Negative GDD for Dispersion Compensation

When transmitting an ultrashort pulse laser beam through a number of optical components, the pulse will spread and become chirped. This matched pair of mirrors are the solution to compensate for pulse broadening effects. These mirrors provide a negative group delay dispersion (-45 fs2 at 800 nm per bounce) to the incoming laser beam with every bounce off the surface. By setting up a two or three mirror configuration, the laser beam can bounce back and forth between the mirrors many times to compensate for pulse dispersion effects. These mirrors can be mounted into Newport's patented clear quadrant mounts - such as SN100C-F2K or U100-A2K - to create the closest separation between two mirrors to allow for a large number of bounces between elements. Refer to our application notes Dispersion Compensation Using Chirped Mirrors for more details.

Cancel Out GDD Oscillations

The coating design of dispersion compensation mirrors has inherent oscillatory fluctuations through the active wavelength band. This phenomenon is a natural result of the coating design. However these oscillations can be cancelled out when using two mirrors that are made such that their oscillations happen at a 180 degrees out of phase.

Equivalent to FemtoOptics GSM107.

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.