Optometrics Group Diffraction Grating

✅ Specs (for the 1200 grooves/mm, 750 nm blaze reflective ruled grating)

• Groove density: 1200 grooves per mm

• Blaze wavelength: ~750 nm, optimized for maximum first-order efficiency around that wavelength

• Groove angle: ~26.74°

• Dispersion at blaze: ~0.74 nm per milliradian

• Substrate: float glass (optically flat)

• Size options: typical dimensions include 12.5 × 25 mm (6 mm thick)  

• Coating: gold overcoat  

• Coating quality: high scratch-dig specification (e.g. 60/40) with 90% clear aperture

⚡ Damage Thresholds (reflective ruled, standard coating)

• Pulsed lasers: ~350 mJ/cm² (200 ns pulse duration)

• Continuous wave: ~40 W/cm²