Diffraction Gratings

Variable Groove Depth (VGD) Master Gratings

Variable Groove Depth (VGD) Master Gratings

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One VGD grating gives you the efficiency of several classical gratings.

Variable Groove Depth (VGD) gratings from HORIBA Jobin Yvon exhibit a continuously-varying groove depth across the grating width, allowing for continuous adjustment of the grating blaze wavelength with a simple lateral translation. When such blaze adjustments are combined with rotational scanning and a narrow beam, our VGD gratings provide a unique opportunity to perform continuous on-blaze scans and to minimize harmonic contamination over a wide spectral range.

VGD Specifications

  • material: non-oriented silicon crystal
  • micro-roughness: less than 0.5 nm RMS
  • slope error: 0.7 µrad RMS
  • land to groove ratio: 0.55 within ±15%
  • coatings: Au, Pt or Ni

HORIBA Jobin Yvon VGD grating technology is compatible with:

  • Silicon and fused silica grating substrates
  • Holographic recording processes
  • Constant, aberration corrected, and VLS groove distributions
  • Ion etching processes
  • XUV reflective coatings
VGD Principle

Our VGD grating technology is compatible with the most-recent synchrotron beamline designs that provide a mm-size synchrotron beam onto the grating. Replacing a classical or multi-track gratings with a HORIBA Jobin Yvon VGD will open new experimental opportunities, with optimized flux performance over the entire beamline spectral range.

Example of VGD Grating

VGD Grating Efficiency Curve