Beam Splitter Selection Guide

Overview

An Optical Beamsplitter is an optic or optical device that is used to split a beam of light in two. Newport offers a wide variety of Beamsplitters in various shapes. Circular beamsplitters, plate beamsplitters and cube beamsplitters can be purchased for polarizing or non polarizing beamsplitting applications. Newport offers both broadband and laser line cube beamsplitters. These beamsplitters are made from high grade glass materials with laser grade surface flatness and surface quality and have a tighter tolerance on the splitting ratio. High damage threshold coating and quality substrate material allow them to withhold high laser pulse energy.

Cube Beamsplitters

	Series	Features
	Broadband Non-Polarizing Cube Beamsplitters	Metal-dielectric hybrid coating Even split of laser power Broadband and chromatically neutral Insensitive to polarization
	Broadband Polarizing Cube Beamsplitters	Superior broadband performance Extinction ratio >500:1, 1000:1 average Low wavefront distortion
	Laser Line Polarizing Cube Beamsplitters	Optimized for higher-power lasers Extinction Ratio >1000:1 for laser line polarizing cube beamsplitters Extinction Ratio > 100:1 for UV laser line polarizing cube beamsplitters Low wavefront distortion
	Laser Line Non-Polarizing Cube Beamsplitters	Virtually zero absorption for true 50/50 beamsplitting Low wavefront distortion Insensitive to polarization
	High-Energy Nd:YAG Laser Polarizing Cube Beamsplitters	Damage threshold up to 10 J/cm² No cement, optically contacted Extinction ratio >200:1 Low wavefront distortion

Broadband Plate Beamsplitters

	Series	Features
	Broadband Dielectric Beamsplitters	S-polarized beams split R/T = 50/50 P-polarized beams split R/T = 30/70 AR coated back surface eliminates ghosting Slight wedge virtually eliminates internal fringes N-BK7 or UV fused silica substrates
	UV Plate Beamsplitters	Virtually zero absorption for true 50/50 beamsplitters Designed for 45° angle of incidence with random polarization AR coated back surface eliminates ghosting Slight wedge to eliminate internal fringes Available in CaF2, ZnSe, UV Fused Silica, and N-BK7
	Pellicle Beamsplitters	Ultra-thin beamsplitter Extremely lightweight Uncoated for beam sampling Coated for beamsplitting Minimizes dispersion and eliminates ghosting
	Polka Dot Beamsplitters	50% reflectance, 50% transmission from 250 to 2500 nm Insensitive to angle of incidence changes 1" diameter round or 2" square sizes Ideal for white light illumination applications
	Broadband Beam Samplers	Uncoated front surface for beam sampling Fresnel reflectance from 1–10% at 45° AR coated back surface eliminates ghosting Slight wedge virtually eliminates internal fringes N-BK7 or UV fused silica substrates
	IR Plate Beamsplitters	50/50 beamsplitting for 2-14 micron wavelengths Thermal shock resistance and low absorption Available in CaF₂ or ZnSe
	Terahertz Visible Broadband Beamsplitters	ITO front surface optimized for 1-120 Thz AR coated back surface for visible wavelengths High quality N-BK7 substrates Beamsplitting ratio maintained over wide wavelength range

Laser Line Plate Beamsplitters

	Series	Features
	Laser Line Non-Polarizing Plate Beamsplitters	Virtually zero absorption for true 50/50 beamsplitters Designed for 45° AOI with random polarization AR coated back surface Slight wedged
	High-Energy Nd:YAG Laser 50/50 Beamsplitters	High damage threshold Fused silica substrates Low wavefront distortion AR coated on back surface
	High-Energy Nd:YAG Laser Harmonic Beamsplitters	High damage threshold Select fused silica Low wavefront distortion Hard refractory coatings

Ultrafast Plate Beamsplitters

	Series	Features
	FemtoOptics™ P Polarized Beamsplitters	Optimized for P polarization at 45 ͦ angle of incidence Choice of 67%, 76%, 80% or 90% splitting ratios Minimum GDD upon both reflection and transmission Beamsplitting or sampling for intense pulses down to 25 fs or less
	Ultrafast Ti:Sapphire Laser Harmonic Beamsplitter	Separate or combine 400 nm & 800 nm Ti:Sapphire harmonics Minimum pulse dispersion low wavefront distortion Hard refractory coatings for high damage threshold AR coated back surface eliminates ghosting
	Beamsplitters for Ultrashort Pulses	50/50 (R/T) split at specified polarization (S- or P-) Minimum pulse dispersion Wide bandwidth of 700-950 or 680-1080 nm Low wavefront distortion
	Beam Sampler for Ultrashort Pulses	3 mm thickness minimizes pulse dispersion Fresnel Reflectance from 1-10% at 45° Uncoated front surface for beam sampling, AR coated back surface

Dichroic Beamsplitters

	Series	Features
	Dichroic Laser Beam Combiners	Combine or separate multiple laser beams Insensitive to polarization Ion-beam sputtered (IBS) coating Perfect for equipment with multi-laser sources
	Fluorescence Longpass Dichroic Filters	Patented Stabilife® Hard Coatings Maximum transmission Lowest autofluorescence Superior field life
	High-Energy Nd:YAG Laser Harmonic Beamsplitters	Separate or combine Nd:YAG fundamental and harmonics High damage threshold Low wavefront distortion Hard refractory coatings
	Ultrafast Ti:Sapphire Laser Harmonic Beamsplitter	Separate or combine 400 nm & 800 nm Ti:Sapphire harmonics Minimum pulse dispersion low wavefront distortion Hard refractory coatings for high damage threshold AR coated back surface eliminates ghosting
	Terahertz Visible Broadband Beamsplitters	ITO front surface optimized for 1-120 Thz AR coated back surface for visible wavelengths High quality N-BK7 substrates Beamsplitting ratio maintained over wide wavelength range