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Product Description

Liquid Crystal Polymer/N-BK7 Window, Three-Layer 1-Inch Double-Edged Substrate
Multi-Level Grating and Wave Plate Combination for Beam Splitting Function
Linearly Polarized Light Incidence, Suitable for 1D or 2D Uniform Beam Splitting
High Beam Splitting Uniformity, High Splitting Efficiency, High Angular Accuracy
Operating Wavelength λ: 532, 1064 nm; Splitting Angle θ: 2°, 4°; Splitting Mode: 1×4, 2×2
Flexible Customization of Parameter Specifications Available

The LBTEK cascaded grating beamsplitter (Multilayer Grating Beamsplitter, MLGS) is fabricated using N-BK7 glass substrate and liquid crystal polymer (LCP) material. It consists of three layers of 1-inch double-edged substrates coated with LCP layers featuring grating and waveplate structures, making it a single-wavelength device. When the incident light is linearly polarized, the cascaded grating beamsplitter can achieve one-dimensional or two-dimensional quad-splitting functionality based on whether the relative orientations of the grating lines at each level are parallel or perpendicular. The resulting beams are circularly polarized with different rotations, and the splitting angle is related to the grating period at each level. The cascaded grating exhibits high transmittance, and through optimized phase design and precise retardation control. It offers higher splitting efficiency and uniformity compared to typical Dammann grating beamsplitters while maintaining high splitting angle accuracy. LBTEK provides standard products of cascaded grating beamsplitters with working wavelengths λ of 532 nm and 1064 nm, and splitting modes of 1×4 and 2×2. Customization of parameters and specifications is also supported to meet diverse application requirements. For details, please consult LBTEK Technical Support.

Attribute

Component MaterialLiquid Crystal Polymer/N-BK7 Window Plate

Surface finish60/40

Component sizeØ25.4×3.0 mm, double 2.7 mm parallel cut edges

Transmission Wavefront Error＜λ/2@633 nm

Clear ApertureØ20 mm

Delay Accuracy & Uniformity±5 nm

Center offset0.5 mm

Beam splitting angle error (full angle)±1 ％

Operating Temperature-20~80 ℃

Beam splitting efficiency＞97 %

Cascaded Grating Beam Splitters, Splitting Mode 1×4

The Grating Lines Are Parallel to Each Other, Achieving a One-dimensional 1×4 Beam Splitting Effect
Linearly Polarized Light Input, Beam Splitting Uniformity >90% or >93%
High Beam Splitting Efficiency, Extremely Low Zero-order Ratio
Standard Wavelengths 532 nm and 1064 nm Available

The LBTEK 1×4 cascaded grating beam splitter features a parallel design for the relative position of grating lines between the primary and secondary gratings, enabling one-dimensional 1×4 beam splitting. When the incident light is linearly polarized, it achieves optimal splitting uniformity, ensuring >90% (532 nm) or >93% (1064 nm). It also offers a high effective order ratio with a splitting efficiency of >97%.

1×4 cascaded grating beam splitter with the morphology of the first-level (left) and second-level (right) gratings under linearly polarized light

	Product Model	Beam splitting mode	Beam divergence angle θ (full angle)	Operating wavelength λ	Unit Price	Compare	Lead Time
	MLGS25-1402-532	1×4	2 °	532 nm	$1300.22		4 weeks
	MLGS25-1404-1064	1×4	4 °	1064 nm	$1300.22		4 weeks

Cascaded Grating Beam Splitters, Splitting Mode 2×2

The Grating Lines Are Mutually Perpendicular, Used to Achieve a Two-dimensional 2×2 Beam Splitting Effect
Linearly Polarized Light Incidence, Beam Splitting Uniformity >90% or >93%
High Beam Splitting Efficiency, Extremely Low Zero-order Proportion
Standard Wavelengths 532 nm and 1064 nm Optional

The LBTEK 2×2 cascaded grating beam splitter features a vertical alignment design between the primary and secondary grating lines, enabling two-dimensional 2×2 beam splitting. When the incident light is linearly polarized, it achieves optimal splitting uniformity, ensuring >90% (532 nm) or >93% (1064 nm). It also maintains a high effective order ratio with a splitting efficiency of >97%.

2×2 cascaded grating beam splitter: primary grating (left) and secondary grating (right) morphology under linearly polarized light

	Product Model	Beam splitting mode	Beam divergence angle θ (full angle)	Operating wavelength λ	Unit Price	Compare	Lead Time
	MLGS25-2202-532	2×2	2 °	532 nm	$1300.22		4 weeks
	MLGS25-2204-1064	2×2	4 °	1064 nm	$1300.22		4 weeks

Cascaded Gratings