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Ultrafast Harmonic Beamsplitter, 25.4 mm, 400 nm Refl., 800 nm Trans.
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  • Diameter
    25.4 mm
  • Reflectance Band
    400 nm
  • Reflectance
    Rs ≥99.8%, Rp ≥99.5%
  • Material
    Fused Silica
  • Transmittance Band
    800 nm
  • Transmittance
    Ts ≥95%, Tp ≥95%
  • Angle of Incidence
    45 °
  • Orientation
    Beam should enter surface marked with an arrow
  • Wavefront Distortion
    ≤λ/4 at 632.8 nm over clear aperture
  • Damage Threshold
    5 MW/cm2 CW, 5.0 J/cm2 @ 1064 nm, 0.1-100 ns, 10 Hz, typical
  • Surface Flatness
    ≤λ/10 at 632.8 nm over clear aperture
  • Surface Quality
    10-5 scratch-dig
  • Diameter Tolerance
    +0/-0.25 mm
  • Thickness
    3.0 mm
  • Thickness Tolerance
    ±0.5 mm
  • Wedge
    ≤3 arc min
  • Clear Aperture
    > central 85% of diameter


Ti:Sapphire Laser Harmonic Beamsplitters

This harmonic beamsplitter is designed to separate harmonic wavelengths of an Ti:Sapphire laser at 45° angle of incidence. It provides high reflection (>99.5%) and transmission (>95%) at specified wavelengths. A V-coat antireflection coating is applied on the back surface to minimize the loss due to reflection. Harmonic beamsplitters are sometimes called Harmonic Separators or Dichroic Filters.

High Damage Threshold

High fluence Ti:Sapphire lasers may be used safely with this beamsplitter. Extra durable multilayer coatings are used for both the front beamsplitting surface, and the AR-coated back surface. This results in a typical damage threshold at 1064 nm of 5 MW/cm2 for CW, 5 J/cm2 for 0.1–100 nsec, 10Hz pulses. Typical damage threshold for wavelength below 532 nm is 1 MW/cm2 for CW, 1 J/cm2 for pulses.

3 mm Thick Fused Silica Substrate

Constructed of durable fused silica, the front surface of the thin 3 mm thickness substrate is coated with an ultrafast optimized beamsplitter coating and the back side coated with an AR coating. This dichroic filter will easily satisfy the need for ultrafast beam harmonics separation.

Reflectance Outside the Design Wavelengths

Reflection and transmission at wavelengths other than the specified wavelengths are uncontrolled and can vary significantly from the curve shown. Use of beamsplitters outside the design wavelengths is not recommended.