Diffraction Amplitude Gratings Definition

Diffraction Amplitude gratings, also known as black and white gratings, are gratings that control the passage or blocking of light by modulating between transparent and opaque areas, changing the intensity of transmitted or reflected light to modulate the incident light to achieve the effect of diffracted or interfered light.

 

Black And White Gratings Product Features:

• All back white stripe amplitude gratings are produced with K9 optical glass, suitable for visible wavelength applications.
• The orientation of the grating is parallel to the short side or parallel to the change, very easy to determine the direction and installation alignment.
• We use photolithography and metal film deposition for high line width accuracy.
• Our standard B/W grating products have a period range of 10um-500um, a line width of 8um-250um, and a line pair count of 2.0-100.0 lines/mm.

 

Precision Grating Black and White Grating – Line Material: Chromium Product Series:

 

Advantages of photolithography for manufacturing black and white amplitude gratings

Photolithography process is the most stable and mature process for black and white amplitude gratings at present.

• We support line width from 0.5um to 250um, period 2um to 1000um customization, line pair density can reach 100 lines/mm or more.
• The lithography pattern boundary is clear, which can provide higher diffraction efficiency.
• The photolithography mask pattern is highly uniform and consistent, which is very suitable for mass production.
• We can process one-dimensional and two-dimensional periodic structures, as well as more complex and irregular array applications.
• Substrate selection of multiple lithography processes supports K9, fused silica, monocrystalline silicon and quartz as substrates.

 

Custom Black and white grating Capability

 

Cr line material in the black and white grating application

• We use Cr to process the black part of the black and white grating material, Cr in glass, fused silica, monocrystalline silicon above the adhesion is very high, can ensure the stability of the grating pattern.
  Cr film in the lithography corrosion resistance, high temperature resistance, to ensure high fineness of the pattern
• Cr in the visible light and near infrared range can effectively block the transmitted light, so that the black and white contrast is obvious.
• We adopt photolithography process combined with Cr film, which can create complex micro-nanostructures.

 

Precision Grating Black and White Grating Applications:

• Industry
  In industry, black-and-white optical encoders are mainly used in the fields of precision measurement and structured light projection. In machine building, semiconductor processing and surface inspection, displacement and shape measurements can be encoded by the encoder.
• Imaging
  In imaging techniques for optical microscopy and OCT, B/W gratings can modulate stripes to enhance the visibility of tiny structures and can be used as wavefront modulation and optical interference in imaging systems.
• Research
  In the field of research, black and white gratings are usually the basic components in the laboratory, mainly used for optical experiments and optical field modulation for laser beam shaping and interference experiments.