LBTEK-Cascaded Grating

Product Description

Liquid Crystal Polymer/N-BK7 Window, Three 1-Inch Dual-Flat Substrates
Multi-Level Grating Combined with Wave Plate Structure for Beamsplitting Function
Linearly Polarized Light Incidence for 1D or 2D Uniform Beamsplitting
High Splitting Uniformity, High Splitting Efficiency, and High Splitting Angle Accuracy
Operating Wavelength λ: 532, 1064 nm; Splitting Angle θ: 2°, 4°; Splitting Mode: 1×4, 2×2
Supports Flexible Customization of Specifications

LBTEK Cascaded Grating Beamsplitter (CGB) is fabricated from N-BK7 glass substrates and liquid crystal polymer (LCP) materials. It consists of three 1-inch dual-flat substrates coated with LCP layers featuring grating and wave plate structures, and is a single-wavelength device. When the incident light is linearly polarized, the CGB can achieve one- or two-dimensional four-beam splitting depending on whether the grating lines between successive layers are parallel or perpendicular. The resulting beams are circularly polarized with opposite handedness, and the splitting angle is related to the grating period of each layer. The multilayer grating provides high transmittance. Through optimized phase design and precise retardance control, it achieves higher splitting efficiency and splitting uniformity compared to typical Dammann grating beamsplitters, while maintaining high splitting angle accuracy. LBTEK offers standard CGB products with operating wavelengths of 532 nm and 1064 nm, and splitting modes of 1×4 and 2×2, with flexible customization of specifications to meet diverse applications. For more details, please contact LBTEK Technical Support.

Diagram

Attributes

Component MaterialLiquid Crystal Polymer/N-BK7 Window

Surface finish60/40

Component sizeØ25.4 × 3.0 mm, with Dual 2.7 mm Parallel Flat Edges

Clear ApertureØ20 mm

Center offset0.5 mm

Beam splitting angle error (full angle)± 1％

Operating Temperature-20–60℃

Beam splitting efficiency＞ 95%

Cascaded Grating Beamsplitter, Splitting Mode 1×4

Grating Lines Mutually Parallel for 1D 1×4 Splitting
Linearly Polarized Light Incidence, Splitting Uniformity > 90% or > 93%
High Splitting Efficiency With Minimal Zero-Order Ratio
Standard Wavelengths of 532 nm and 1064 nm

The grating lines of the first- and second-level gratings in the LBTEK 1×4 CGB are designed in a parallel configuration for achieving 1D 1×4 beamsplitting. When the incident light is linearly polarized, the splitting uniformity is optimal, ensuring > 90% at 532 nm or > 93% at 1064 nm. The device also features a high effective diffraction order ratio with a splitting efficiency of > 97%.

First-Level (Left) and Second-Level (Right) Gratings in 1×4 CGB Under Linearly Polarized Light

	Product Model	Beam splitting mode	Beam divergence angle θ (full angle)	Operating wavelength λ	File	Unit Price	Compare	Lead Time
	MLGS25-1402-532	1×4	2°	532 nm		$1,362.97		4 weeks	Add Cart
	MLGS25-1404-1064	1×4	4°	1064 nm		$1,362.97		4 weeks	Add Cart

Cascaded Grating Beamsplitter, Splitting Mode 2×2

Grating Lines Mutually Perpendicular for 2D 2×2 Splitting
Linearly Polarized Light Incidence, Splitting Uniformity > 90% or > 93%
High Splitting Efficiency With Minimal Zero-Order Ratio
Standard Wavelengths of 532 nm and 1064 nm

The grating lines of the first- and second-level gratings in the LBTEK 2×2 CGB are designed in a perpendicular configuration for achieving 2D 2×2 beamsplitting. When the incident light is linearly polarized, the splitting uniformity is optimal, ensuring > 90% at 532 nm or > 93% at 1064 nm. The device also features a high effective diffraction order ratio with a splitting efficiency of > 97%.

First-Level (Left) and Second-Level (Right) Gratings in 2×2 CGB Under Linearly Polarized Light

	Product Model	Beam splitting mode	Beam divergence angle θ (full angle)	Operating wavelength λ	File	Unit Price	Compare	Lead Time
	MLGS25-2202-532	2×2	2°	532 nm		$1,362.97		4 weeks	Add Cart
	MLGS25-2204-1064	2×2	4°	1064 nm		$1,362.97		4 weeks	Add Cart