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| Coad | 670198 | Substrate | Liquid Crystal Polymer / N-BK7 | |
| Type | Dammann Grating | Clear Aperture | 15.0 x 15.0mm | |
| Dimension(mm) | 25.4 x 3.2 | RMS | ±5nm | |
| Wavelength(nm) | 1064 | Diffraction Efficiency | >75% | |
| Beam Split Angle θ (°) | 4（MAX） | Beam Split Angle Error | ±1% | |
| Beam Split Mode | 1×7 | Beam Split Uniformity | >85% | |
| Transmittance | >98% | Operating Temperature | -20 - 80℃ | |
| Surface Quality | 60-40 | Transmission Wavefront Deviation | ＜λ/4@633nm | |
| Coating Type | AR Coating | Coating Specifications | Ravg<0.5%@700-1100nm,AOI=0° |
LBTEK Dammann gratings (DG) are fabricated using liquid crystal polymer (LCP) birefringent materials on N-BK7 glass substrates, forming a “glass substrate–LCP functional layer–glass substrate” sandwich structure. They are unmounted and feature a single-side chamfer. In the LCP layer, the fast-axis orientation of the liquid crystal molecules varies periodically between 0° and 90° along the x-axis, providing a uniform λ/2 retardation across the entire device plane, making them single-wavelength devices.
The surface of a Dammann grating consists of a series of position-encoded binary phase structures, which can easily split a single laser beam into multiple beams of equal intensity. With their planar structure, high diffraction efficiency, and high splitting ratio, Dammann gratings offer unique advantages. Compared with conventional gratings and cascaded grating beam splitters, a single Dammann grating can achieve odd-number beam splitting and higher point-count splitting.
LBTEK provides standard Dammann gratings designed for operating wavelengths of 532 nm and 1064 nm, with a 1×7 splitting mode and splitting angles of 2° and 4°, respectively. These gratings are unmounted, with a single-side chamfer, and custom specifications are also supported.
LBTEK one-dimensional 1×7 Dammann gratings are designed with a π phase difference between adjacent rectangular regions, enabling uniform 1×7 beam splitting. With linearly polarized incident light, the splitting uniformity is optimized, and diffraction efficiency can reach the theoretical value. Standard products are unmounted, featuring a single-sided 1.5 mm chamfer aligned parallel to the grating lines. The 1×7 Dammann gratings have a grating period of 90 µm, and to ensure uniform beam spot distribution, an incident beam diameter greater than 0.3 mm is recommended.
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