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Gratings

CASTECH provides replicas copied from the master grating. It has the same performance but with much competitive price. Customized solution is available from prototype building to high volume production.
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Diffraction Gratings for Telecommunication

 

  • Material from DUV to IR
  • Custom dimension and shapes
  • Wafer type: Plano or Prism
  • Grating type: Transmission or reflection grating
  • Line density: Up to 3000line/mm
  • Line density uniformity: ± 0.5 line/mm
  • Wavelength range: 1525-1575nm
  • Central wavelength: 1550 nm
  • Angle of incidence(AOI): Littrow or Customized
  • Optical polarization: TE/TM
  • Diffraction efficiency: >94.0%
  • Clear aperture: ≥95%
  • Wavefront distortion: λ/4@632.8nm
  • Surface quality: 40-20 S/D
  • Parallelism:< 0.1°
  • Coating: Au or Dielectric coatings
  •  

    CASTECH typically employs fused silica or ULE characterized with low absorption and superior stability for the fabrication of gratings. Other optical glass are also available upon request.

    Our high DE reflection grating is ideal for WSS and other applications in optical communication industry. Generated by our state-of-art holographic, iron etching and replication technology, the precise realization of grating designs is enabled that provides high diffraction efficiency and perfect uniformity. The replicas copied from the master grating have the same performance such as low light scatter, extreme environmental stability, excellent groove uniformity at a lower price. Customized solution is available from prototype building to high volume production.

     

    Kimmon He-Cd (Helium Cadmium) Laser
    Holographic System

     

    Diffraction Gratings for Pulse Compression

     

  • Material from DUV to IR
  • Custom dimension and shapes
  • Grating type: Plano grating
  • Line density: 1700line/mm
  • Line density uniformity: ± 0.5 line/mm
  • Wavelength range: 1020-1050nm
  • Central wavelength: 1040 nm
  • Angle of incidence(AOI): Littrow incidence
  • Optical polarization: TM
  • Diffraction efficiency: >94.0%
  • Clear aperture: >90%
  • Wavefront distortion: λ/4@632.8nm
  • Surface quality: 40-20 S/D
  • Parallelism:< 0.1°
  • Coating: Au layer
  •  

    CPA technique is widely used for generation of ultra-short and high energy pulse of lasers. Grating is one of the most critical components in the pulse stretch and compression system to determine their performance.

    CASTECH’s reflection grating has been successfully applied on pulse compression, which is created by our unique holographic, iron etching and replication technique. The grating delivers low scattering, high diffraction efficiency and features in extreme competitive pricing as well.

    Customized solution is available from prototype building to high volume production.

    DE of Pulse Compressed Grating
    Agilent Tunable Laser
    Diffraction Efficiency Testing System

     

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