Diffraction Phase Transmission Grating Description

Phase diffraction transmittance grating is a type of transmission grating that realizes diffraction by changing the phase of light waves through a periodic structure. Unlike black and white gratings, phase diffraction transmittance gratings form a regular diffraction pattern through changes in the refractive index or thickness of the material, where light waves in different areas have different optical ranges due to different refractive indices or thicknesses. Coligh uses photolithography to etch on fused silica or optical glass, precisely controlling the depth of the steps and the modulation of the refractive index, to realize the phase distribution, and the products are widely used in the fields of diffraction spectroscopy and pulse compression. Coligh’s products are widely used in the fields of diffraction spectroscopy and pulse compression.

 

Diffraction Phase Transmission Grating Key Features:

• Our bit-phase diffraction grating is a planar laminar structure.
• All grating directions are parallel to the edges, suitable for specific installation and incidence angle control scenarios
• The material is fused silica, which has high transmittance, high stability and resistance to laser damage.
• The center wavelength is designed to match commonly used laser wavelengths such as 650nm, 808nm and 980nm.
• Multiple line density and period parameters are available to accommodate different resolutions and diffraction angles.

 

Standard Diffraction Phase Transmission Grating Product Series

 

Advantages of our photolithography phase diffraction transmission grating

• We use photolithography + etching process for phase diffraction transmission grating processing, photolithography technology can prepare high-resolution graphics, and can precisely control the line width and cycle time, to ensure a high degree of consistency and repeatability of the grating, and is very suitable for batch processing.
• By optimizing the etching parameters, photolithography phase diffraction transmittance gratings can precisely regulate the phase depth and improve the diffraction efficiency.
• We can provide flexible customization, such as free curves, asymmetric structures and other complex patterns. In addition, the grating period, external dimensions, and thickness can be customized according to the customer’s needs.

Phase Gratings Custom Capability

Diffraction phase grating manufacturing process

• Design according to customer requirements
• Make mask plate
• Photolithography
• Dry etching
• Inspection of morphology and optical test
• Packaging and shipment

 

Diffraction Phase Transmission Grating Applications

• High Power Laser
  In high power laser processing, cutting and welding applications, phase diffraction gratings can be used for beam shaping, or designed as a single or multi-stage DOE system to multipoint beam splitting and focusing lasers.
• Consumer Electronics
  In applications such as face recognition, AR/VR and other 3D perception and imaging applications, phase diffraction gratings are one of the core devices, which can realize complex light field design, projection of structured light in modules, and spot irradiation.
  Customized for scientific research
• Scientific Research
  Wavefront modulation and interference experiments are often designed in experiments for scientific research, and phase diffraction gratings can realize complex optical requirements, such as Fourier transforms and Bessel beams. Diffraction phase gratings can be used as wavefront controllers or diffractive elements for laser modulation, optical simulation, etc.