Beam Splitters (DOE)

Beam Splitter

Diffractive beam splitters from Sintec effectively separate a single incident laser beam into multiple non-overlapping beams. The intervals, intensity ratios and symmetrical distribution of the beams are freely selectable and are set by the periodic microstructures of the beam splitter with great accuracy and high repeatability. At the same time, the pergence angle, diameter and polarization of the incident beam remain unchanged.

As a result, the energy emitted by the laser is better distributed for multiple channel processing, thus enhancing both efficiency and performance. This makes our high-precision diffractive microoptics ideal for LIDAR applications involving color separation, material processing for surgical procedures as well as in the field of metrology, as a few examples. You can also achieve better results during laser welding by using multiple laser beams with fixed angular separation and power ratios, thereby optimizing the transfer of heat into the material, for instance.

For your specific applications, Sintec also offers polarizing beam splitters, which allow you to separate the s and p polarization and adjust their intensity ratio.

Diffractive Elements for Off-axis Illumination

Multi-pole pupil illumination is required to achieve maximum resolution in mask projection systems. Diffractive optical elements (DOE) from Sintec effectively produce such distributions with high accuracy and uniformity both within and between the inpidual poles.

We use high-quality materials for all our diffractive elements. This ensures a long service life, even in the case of intensive UV laser irradiation.

Gratings

Diffraction gratings are Binary Phase Gratings. These are a special case of a 1D Damman grating with a duty cycle of 50% within a period. Our gratings are transmission gratings, but can be offered in reflective versions as desired. In this section, we present our standard list of gratings with custom etching depth (modulation depth).

In addition to standard gratings, we can offer gratings with custom specifications (duty cycle, modulation depth, period, reflection or transmission grating).

Multi-spot Beam Splitter

A Beam splitter element converts input laser beam into a 1 or 2-dimensional array of beamlets according to custom parameters.

The Diffractive Beam Splitter is a diffractive optical element used to split a single laser beam into several beams, each with the characteristics of the original beam (except for its power and angle of propagation).

A diffractive beam splitter can generate either a 1-dimensional beam array (1xN) or a 2-dimensional beam matrix (MxN), depending on the diffractive pattern on the element. The diffractive beam splitter is used with monochromatic light such as a laser beam, and is designed for a specific wavelength and angle of separation between its output beams.

In this section, we present our standard list of 1D, 2D, and custom diffractive beam splitters.

We offer, in addition to standard diffractive beam splitters, the possibility to choose the number of spots and their locations, as a part of its custom design and manufacturing capability.

We also offer Binary Phase Gratings, which is a special case of 1D Damman grating with a duty cycle of 50% within a period. The gratings are transmission grating. In addition to standard gratings, We offer gratings with custom specifications (duty cycle, modulation depth, period, reflection or transmission grating).

1D diffractive beam splitters

2D diffractive beam splitters

Custom Beam Splitters

Binary Phase Grating – Diffractive Grating

Dielectric Mask

Dielectric masks are glass substrates that have a very thin (~1um) reflective patterned coating. The coated part reflects the incoming beam while the uncoated part transmits the beam. The output in the near field will be very close to the shape of the pattern. In the far field some diffraction patterns may appear. One should not see significant diffraction, if one projects with a lens the output of the mask to an image plane, as shown in the figure below.

Application:

One can narrow the transition region from a beam-shaper by using the Dielectric mask as in the figure below. One can also create any pattern that will be imaged with a lens. One cannot manage the intensity profile within a spot.

Dielectric (Projection / Imaging) Mask – Precision aperture for high power laser