Compare Model Drawings, CAD & Specs Diameter Wavelength Range Material Surface Quality Availability Price
$104
25.4 mm 480-700 nm Grade A N-BK7 15-5 scratch-dig
$115
25.4 mm 700-950 nm Grade A N-BK7 15-5 scratch-dig
$125
25.4 mm 1290-1580 nm Grade A N-BK7 15-5 scratch-dig
$120
25.4 mm 480-700 nm UV Grade Fused Silica 15-5 scratch-dig
$130
25.4 mm 700-950 nm UV Grade Fused Silica 15-5 scratch-dig
$140
25.4 mm 1290-1580 nm UV Grade Fused Silica 15-5 scratch-dig
$272
25.4 mm 480-700 nm UV Grade Fused Silica 10-2 scratch-dig
$282
25.4 mm 700-950 nm UV Grade Fused Silica 10-2 scratch-dig
$298
25.4 mm 1290-1580 nm UV Grade Fused Silica 10-2 scratch-dig
$206
50.8 mm 480-700 nm Grade A N-BK7 15-5 scratch-dig
$233
50.8 mm 700-950 nm Grade A N-BK7 15-5 scratch-dig
$258
50.8 mm 1290-1580 nm Grade A N-BK7 15-5 scratch-dig
$258
50.8 mm 480-700 nm UV Grade Fused Silica 15-5 scratch-dig
$284
50.8 mm 700-950 nm UV Grade Fused Silica 15-5 scratch-dig
$298
50.8 mm 1290-1580 nm UV Grade Fused Silica 15-5 scratch-dig
$325
50.8 mm 480-700 nm UV Grade Fused Silica 10-2 scratch-dig
$347
50.8 mm 700-950 nm UV Grade Fused Silica 10-2 scratch-dig
$368
50.8 mm 1290-1580 nm UV Grade Fused Silica 10-2 scratch-dig
$565
76.2 mm 480-700 nm UV Grade Fused Silica 15-5 scratch-dig
$595
76.2 mm 700-950 nm UV Grade Fused Silica 15-5 scratch-dig
$623
76.2 mm 1290-1580 nm UV Grade Fused Silica 15-5 scratch-dig
$1,080
76.2 mm 480-700 nm UV Grade Fused Silica 10-2 scratch-dig
$1,190
76.2 mm 700-950 nm UV Grade Fused Silica 10-2 scratch-dig
$1,268
76.2 mm 1290-1580 nm UV Grade Fused Silica 10-2 scratch-dig

Specifications

  • Angle of Incidence
    45°
  • Reflection
    Rs = 50 ±5%, Rp ≤Rs
  • Damage Threshold
    500 W/cm2 CW, 0.5 J/cm2 with 10 nsec pulses, typical
  • Surface Flatness
    λ/10 at 632.8 nm over the clear aperture
  • Diameter Tolerance
    +0/-0.13 mm
  • Thickness Tolerance
    ±0.38 mm
  • Wedge
    30 ±15 arc min
  • Clear Aperture
    > central 80% of diameter
  • Chamfers Angle Tolerance
    45° ±15°
  • Durability
    MIL-C-675C, moderate abrasion million cycles
  • Cleaning

Features

Polarization Effects

Our beamsplitting optics are designed for splitting or combining laser beams, which commonly have S-polarized output in a typical scientific setup. S-polarization will be equally split with R/T = 50/50 at 45° incidence. P-polarized beams will be split 30/70 (R/T). Unpolarized light will be split 40/60 (R/T) on average.

Three Broadband Dielectric Beamsplitter Coatings

Beamsplitters are available with a wide selection of broadband dielectric coatings on the reflecting surface and matching anti-reflection coatings on the back surface. Each set of coatings is essentially achromatic across a wide spectral band so that a single optic will work for the entire range of a particular tunable laser, for several laser diode wavelengths, or for most visible laser wavelengths. BS.1 covers the 480-700 nm spectral range, BS.2 covers the 700-950 nm spectral range and BS.3 covers the 1290-1580 nm spectral range.

AR Coated Back Surfaces

An antireflection coating NC.x is applied on the back surface to minimize ghost reflections. Three broadband AR coatings are offered and optimized for 45° angle of incidence beams with <0.75% reflectance. NC.1 covers the 440-700 nm spectral range, NC.2 covers the 660-1000 nm spectral range and NC.3 covers the 1010-1550 nm spectral range.

N-BK7 Substrates for VIS and NIR Applications

N-BK7 is an excellent lens material for general use such as 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.

UV Fused Silica for UV & Broadband Applications

UV Grade Fused Silica is synthetic amorphous silicon dioxide of extremely high purity providing maximum transmission from 195 to 2100 nm. This non-crystalline, colorless silica glass combines a very low thermal expansion coefficient with good optical qualities, and excellent transmittance in the ultraviolet region. Transmission and homogeneity exceed those of crystalline quartz without the problems of orientation and temperature instability inherent in the crystalline form. It will not fluoresce under UV light and is resistant to radiation. For high-energy applications, the extreme purity of fused silica eliminates microscopic defect sites that could lead to laser damage.

Slight Wedge Suppresses Unwanted Fringes

Optics with perfectly parallel faces are unsuited for use as reference elements in laser setups as reflections from both surfaces would be collinear resulting in undesired large period fringes. Introduction of a slight wedge causes unwanted reflections from the second surface to be deflected from the optical path. An arrow on the side points to the non-wedged side (S1) of the beamsplitter, where has the BS.x beamsplitter coating.