Compare Model Drawings, CAD & Specs Availability Price
Laser Beam Sampler, Ultrafast, 25.4 mm Diameter, 3.0 mm Thick
In Stock
In Stock


  • Diameter
    25.4 mm
  • Antireflection Coating
    660-1000 nm
  • Material
    Grade A N-BK7
  • Surface Quality
    15-5 scratch-dig
  • Angle of Incidence
    45 °
  • Coating Code
  • Substrate Number
  • Surface Flatness
    ≤λ/10 at 632.8 nm over the clear aperture
  • Durability
    MIL-C-675C, moderate abrasion million cycles
  • Chamfers
    0.25-0.76 mm face width
  • Chamfers Angle Tolerance
    45° ±15°
  • Damage Threshold
    500 W/cm2 CW, 0.5 J/cm2 with 10 nsec pulses, typical
  • Diameter Tolerance
    +0/-0.13 mm
  • Wedge
    30 ±15 arc min
  • Efficiency
    Ravg < 0.75% @ 660-1000 nm
  • Thickness
    3.0 mm
  • Thickness Tolerance
    ±0.38 mm


Sample Ultrashort Pulses

In a beam sampler, percentage of reflected light is determined by the Fresnel reflection from a single surface. At the nominal 45° AIO the beam sampler reflects approximately 10% and 1% for s- and p- polarizations, respectively. For measuring beam power, the beam sampler should be oriented such that the laser is p-polarized. This choice will maximize transmitted power and attenuate power incident on the detector. Depending on the polarization of the incident beam, front surface reflectance from 1-10% can be attained at 45° incidence.

N-BK7 Substrates for VIS and NIR Applications

N-BK7 is an excellent lens material for most visible and near infrared applications. It is the most common borosilicate crown optical glass, and it provides great performance at a good value. Its high homogeneity, low bubble and inclusion content, and straightforward manufacturability make it a good choice for transmissive optics.