LBTEK-Dammann Grating

Product Description

Linearly Polarized Light Incidence Enables Uniform 1D Odd- or Even-Number Beamsplitting
Planar Structure with High Beamsplitting Ratio and High Diffraction Efficiency
Operating Wavelengths: 532 nm, 1064 nm; Beamsplitting Angle: 2°, 4°; Beamsplitting Pattern: 1×7
Liquid Crystal Polymer / N-BK7 Windows, Sandwich Planar Structure, No Housing, with Flat Edge
Liquid Crystal Molecular Fast-Axis Orientation Exhibits Periodic 0°–90° Binary Variation Along the x-Axis, λ/2 Retardance
Supports Flexible Customization of Specifications

LBTEK Dammann Grating (DG) is fabricated from birefringent liquid crystal polymer (LCP) and N-BK7 glass substrates, featuring a sandwich structure consisting of front and rear glass substrates with a central LCP functional layer. The device has no mechanical housing and features a flat edge on one side. Within the LCP layer, the fast-axis orientation of the liquid crystal molecules exhibits a periodic 0°–90° binary variation along the x-axis, with λ/2 retardance across the entire device plane, making it a single-wavelength device. The Dammann grating surface consists of a series of position-encoded binary phase structures that can readily split a laser beam into multiple beams of equal intensity. It offers unique advantages including a planar structure, high diffraction efficiency, and a high beamsplitting ratio. Compared to conventional gratings and cascaded grating beamsplitters, the Dammann grating can achieve odd-number beamsplitting and a larger number of spots from a single element. LBTEK offers standard Dammann gratings with operating wavelengths of 532 nm and 1064 nm, with a beamsplitting pattern of 1×7 and beamsplitting angles of 2° and 4°, respectively. The standard products are unmounted with a single 1.5 mm flat edge. LBTEK also supports flexible customization of specifications to accommodate diverse requirements across different application scenarios. For more information, please contact LBTEK Technical Support.

Diagram

Attributes

Component MaterialLiquid Crystal Polymer/N-BK7 Window

Component sizeØ25.4 × 3.2 mm, D-type 1.5 mm Flat Edge

Retardance Accuracy±5 nm

Surface Quality (Scratch/Dig)60/40

Delay Uniformity±5 nm

Operating Temperature-20~60℃

Beam splitting uniformity> 85%

1D Dammann Grating

Linearly Polarized Light Incidence Enables Uniform 1D 1×7 Beamsplitting
Odd-Number Beamsplitting with High Diffraction Efficiency and High Beamsplitting Ratio
Standard Wavelengths of 532 nm and 1064 nm Available

LBTEK 1D 1×7 Dammann Grating has a phase difference of π between adjacent strip regions, enabling uniform 1×7 beamsplitting. When linearly polarized light is incident, the beamsplitting uniformity is maximized and the diffraction efficiency can reach the theoretical value. The standard products are unmounted with a 1.5 mm flat edge on one side, and the flat edge direction is parallel to the grating lines. The period of the standard 1×7 Dammann Grating is 90 μm. To ensure beamsplit spot uniformity, an incident spot diameter greater than 0.3 mm is recommended.

Structure of the 1×7 Dammann Grating Under a Polarizing Microscope

	Product Model	Operating Wavelength	Beam splitting mode	Maximum Beam Splitting Angle (Full Angle)	File	Unit Price	Compare	Lead Time
	DG25-1702-532	532 nm	1 × 7	2°		$1,090.38		5 weeks	Add Cart
	DG25-1704-1064	1064 nm	1 × 7	4°		$1,090.38		5 weeks	Add Cart