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Diffraction gratings are widely used for pulse compression in Chirped Pulse Amplification (CPA) laser systems. High diffraction efficiency, high wavefront quality and high damage threshold are essential characteristics for these gratings.

HORIBA Jobin Yvon has pioneered the design and development of pulse compression gratings using holographic techniques. By carefully designing the grating groove parameters, gold-coated pulse compression gratings can achieve diffraction efficiencies as high as 94% at either 800 nm or 1.053 µm. In addition, the holographic manufacturing technique can produce very large gratings that demonstrate an excellent stability and quality of the diffracted wavefront.

In CPA lasers where the highest optical performance and damage thresholds are required, a master gold-coated holographic grating ensures best performance. Master gratings are the technology of choice for large-area gratings, and HORIBA Jobin Yvon currently supplies several standard sizes up to 210x420 mm . Standard groove densities include 1200, 1480, 1740 and 2000 lines/mm, for operation at 800 nm or 1053 nm. Custom sizes can be considered up to 500x500 mm, and alternate groove densities, non-standard wavelength optimization, and/or larger grating sizes will be reviewed upon request.

• Optimized holographic ruling
• Gold layer coating
• Highly polished blanks
• Large range of standard and custom sizes for all groove densities

• Efficiency:
  90% average absolute efficiency at 800 nm or 1053 nm in near-Littrow configuration (10° deviation angle between the incident and diffracted beams).
• Wavefront quality:
  better than l/4 at 800 nm or at 1 053 nm in the -1 diffracted order..

• Five standard groove densities
• Eight standard sizes
• Optical coating: gold (included)

For large gratings (165x220 mm and larger):

• Absolute efficiency, measured in nine spots distributed over the clear aperture of the grating
• Interferograms of -1 order and 0-order wavefronts
• A certificate of conformity

For small gratings:

• Absolute efficiency, measured in the center of the grating
• Quality of the -1 order diffracted wavefront
• A certificate of conformity

Diffraction efficiency according to incident angle:

Efficiency values depend primarily on deviation angle (angle between incident beam and diffracted beam). In general, if deviation angle does not exceed 15°, the efficiency and bandpass remain stable, if deviation angle exceeds 15°, a careful evaluation is necessary (see 1200 gr/mm grating variable incidence efficiency curve example).
For the same deviation angle, bandpass depends on the incidence angle being smaller or larger than the Littrow angle (less or more grazing incidence angle). In general more grazing incidence angle is more favourable for the bandpass.