Dammann Gratings are specialized diffractive optical elements that efficiently and uniformly split an incident laser beam into multiple output beams arranged in a pre-designed, regular array of grating patterns.

Principle of Dammann Gratings

Unlike traditional black-and-white gratings or phase gratings, Dammann gratings do not distribute energy through periodic structures. Essentially a binary phase grating, it redistributes the energy of the incident light to specific higher-order diffraction modes through precise, complex multi-level phase modulation within the grating period.

Advantages and Characteristics of Daman Grating

As a type of laser beam splitter, Daman grating can generate one-dimensional or two-dimensional multi-beam arrays such as 3×3, 5×5, or 9×9 dot patterns with exceptionally high beam energy uniformity. Being a pure phase element with no optical absorption, it achieves remarkably high diffraction efficiency.

What is Damman Grating’s Application in Laser Beam Shaping

In laser beam shaping, Damman gratings perform more than simple beam splitting. They precisely modulate the laser wavefront through microscopic relief structures on their surface, introducing specific discrete phase delays to light at different spatial positions within the beam. This creates the desired intensity pattern in the far field.

Damman Grating serves the following functions:

• Damman Grating can transform a single high-power laser beam into dozens or hundreds of identical laser dot patterns. These one-dimensional or two-dimensional beams are suitable for laser drilling, multi-point synchronous machining, and 3D structured light measurement.
• Beyond generating uniform dot patterns, Damman Grating can also produce sinusoidal stripes for structured light in 3D scanning.
• Damman gratings precisely control the relative phase of each output beam to construct optical trap arrays.

Custom Solution for Damman Grating Design

Coligh is the manufacturer of Damman Gratings. We provide custom Damman grating services.

Within the wavelength range of 193nm-2000nm, we customize Damman Grating components according to customer requirements. The number of beam splitters and angular spacing are determined by the customer, and we also provide coating services. We can customize one-dimensional Damman Gratings and two-dimensional Damman Gratings, with the diffraction efficiency tailored to customer specifications. Contact us for more details.