Compare Model Drawings, CAD & Specs Diameter Effective Focal Length (EFL) F/# Availability Price
25.4 mm 250 mm 9.8
In Stock
25.4 mm 50 mm 2
In Stock
In Stock
50.8 mm 1000 mm 19.7
In Stock
In Stock
50.8 mm 1500 mm 29.5
In Stock


  • Wavelength Range
    700-930 nm
  • Mirror Shape
  • Material
    Fused Silica
  • Coating Type
    Broadband Ultrafast Pulse Coating
  • Coating Code
  • Angle of Incidence
  • Reflectivity
    RS>99% @ 700-930 nm; RP>99% @ 730-870 nm
  • Damage Threshold
    1 TW/cm2 peak power @ 800 nm, 100 fs, 5 kHz
  • Surface Accuracy, Power
    1.5λ @ 632.8 nm
  • Surface Accuracy, Irregularity
    λ/4 @ 632.8 nm
  • Surface Quality
    15-5 scratch-dig
  • Back Surface
    Commercial Polish
  • Edge Thickness (Te)
    3.0 mm
  • Thickness Tolerance
    ±0.25 mm
  • Focal Length Tolerance
  • Diameter Tolerance
    ±0.25 mm
  • Clear Aperture
    ≥central 80% of diameter
  • Cleaning


High Reflectance UF.25 Ultrafast Coating

UF.25 ultrafast mirror coating is designed to provide maximum reflectivity and bandwidth with minimum effect on pulse dispersion. Careful thin film design and an advanced coating process result in a broadband mirror with exceptional performance characteristics. This coating is optimized at 45° AOI for steering ultrafast pulsed lasers and provides simultaneous reflectance for both S- and P-polarized light, over 99% reflectance from 730-870nm for P-polarization and 700-930nm for S-polarization.

Low GDD and the Cubic Term

Group delay dispersion (GDD) and the cubic term of the phase expansion are shown below for reference. True mirror performance can be affected by manufacturing tolerances and repeatability. Newport minimizes these effects with the use of state-of-the-art thin film production equipment and computer controlled processes. These mirrors have been successfully field tested at several university and industrial laboratories engaged in ultrafast studies and have been found to have high performance very closely matching these calculated curves.

Leaky Mirror

The rear surface of the low GDD ultrafast mirror is uncoated and polished to allow undistorted transmission of leaked ultrafast beams. A tiny component of incident ultrafast beam will transmit through the mirror and may be measured to characterize the ultrafast pulses.

High Laser Damage Threshold

Our ultrafast laser mirrors have been laboratory tested for laser damage. They were found to withstand 1 TW/cm2 peak power with 100 fsec pulses at 5 kHz at 800 nm.