Broadband Dielectric Beamsplitters

Beamsplitting Optics

Our Broadband Dielectric Beamsplitters are designed to split or combine laser beams operating in the visible through infrared wavelengths. Split ratio is 50/50 R/T for S-polarized light at 45 degrees incidence. Unwanted interference effects are reduced due to a slightly wedged substrate, and an AR coating on the back surface.

Models

Broadband Dielectric Beamsplitter, 25.4 mm, N-BK7, 480-700 nm

10B20BS.1

25.4 mm,480-700 nm,Grade A N-BK7,15-5 scratch-dig,45 °
€ 491

Broadband Dielectric Beamsplitter, 25.4 mm, N-BK7, 700-950 nm

10B20BS.2

25.4 mm,700-950 nm,Grade A N-BK7,15-5 scratch-dig,45 °
€ 500

Broadband Dielectric Beamsplitter, 25.4 mm, N-BK7,1290-158 0nm

10B20BS.3

25.4 mm,1290-1580 nm,Grade A N-BK7,15-5 scratch-dig,45 °
€ 510

Broadband Dielectric Beamsplitter, UVFS, 25.4 mm, λ/10, 480-700 nm

10Q20BS.1

25.4 mm,480-700 nm,UV Grade Fused Silica,15-5 scratch-dig,45 °
€ 505

Broadband Dielectric Beamsplitter, UVFS, 25.4 mm, λ/10, 700-950nm

10Q20BS.2

25.4 mm,700-950 nm,UV Grade Fused Silica,15-5 scratch-dig,45 °
€ 514

S-polarized beams split 50/50 (R/T)
P-polarized beams split 30/70 (R/T)
AR coated back surface eliminates ghosting
Slight wedge virtually eliminates internal fringes
N-BK7 or UV fused silica substrates
Beamsplit ratio maintained over wide wavelength range

Shared Specifications

Note: Specifications below are common to all products presented. See Individual product details for complete information.

Features

Wide Spectral Range

Each coating 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. An arrow on the side points to the non-wedged side (S1) of the beamsplitter, which contains the BS coating.

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.

Three Broadband Dielectric Coatings

Beamsplitters are available with a wide selection of broadband dielectric coatings on the reflecting surface, and matching antireflective 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. An arrow on the side points to the non-wedged side (S1) of the beamsplitter, which contains the BS coating.

BK7 or UV Fused Silica Substrates

These beamsplitters are available in either N-BK7 for general use, or UV grade fused silica for optimal wavefront and thermal stability.

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.