Planar holographic grating

• Material: Borofloat glass
• Characteristics: Performance is largely independent of the angle of incidence
• Diffraction efficiency: 45% to 65% efficiency at peak wavelength
• Available sizes: 12.7× 12.7×6mm, 25×25×6mm, 50×50×10mm

       The advantage of Plane Holographic Grating is that it can be made with a high number of engraved lines, which is suitable for applications requiring high resolution, and it has no ghost lines and very low stray light, so it is also very suitable for applications that require high signal-to-noise ratio, such as fluorescence spectroscopy and Raman spectroscopy, while its disadvantage is low diffraction efficiency.

A planar holographic grating is a duplication of the parent grating. The grating replication process is as follows: a photosensitive material is plated on an optical substrate and placed between the monochromatic light generated by the laser and the intersecting beam composed of coherent light beams, so that the photosensitive material is sensitive. Intersecting laser beams produce a series of parallel and equidistant interference fringes (the intensity of the fringes varies according to the sinusoidal shape) to obtain the parent grating. When copying, the substrate is first coated with a reflective coating, then the top layer is coated with an epoxy layer, the groove surface is copied, and finally the duplicated grating is separated from the parent grating, and the planar holographic grating is obtained. Because the shape and spacing of the notch lines of the planar holographic grating are completely consistent, the stray light generated is much less than that of the planar scribing grating.

Dimension-labs offers a wide range of planar holographic gratings (specific sizes and parameters can be filtered from the details below) to meet your needs for a wide range of applications.