GGR01 Planar Ruled Diffraction Grating

Overview

The GGR01 Planar Ruled Diffraction Grating is a precision optical component engineered for high-fidelity spectral dispersion in laboratory and industrial optical systems. Fabricated via mechanical ruling using diamond stylus techniques on optically polished float glass substrates, it delivers deterministic groove geometry with controlled blaze angles—enabling optimized diffraction efficiency at designated wavelengths. Unlike holographic gratings, ruled gratings exhibit superior signal-to-noise ratio in first-order diffraction and reduced ghosting under high-intensity illumination, making them preferred for demanding applications such as CO₂ laser beam steering, FTIR spectrometer monochromators, and UV vacuum spectroscopy. The GGR01 series supports both infrared (10.6 µm) and ultraviolet–near-infrared (30 nm–1000 nm) spectral regions, with discrete groove densities (75, 100, 150, and 300 lines/mm) and precisely calibrated blaze angles to match system-level optical design requirements.

Key Features

• High-precision mechanical ruling process ensures consistent groove spacing and angular fidelity across the active aperture
• Float glass substrate with surface quality rated to ISO 10110-7 Grade 4 (scratch-dig 60–40), minimizing wavefront distortion
• Aluminum overcoat with protective dielectric layer for enhanced reflectivity and environmental stability
• Clear aperture ≥90% of nominal dimensions, supporting integration into collimated or focused beam paths without vignetting
• Laser damage threshold certified per ISO 21254: 350 mJ/cm² (200 ns, 10.6 µm, 10 Hz) and 40 W/cm² (CW, 10.6 µm), suitable for moderate-power laser applications
• Dimensional tolerances held to ±0.5 mm in length/width and ±0.5 mm in thickness—compatible with standard kinematic mounts and grating holders

Sample Compatibility & Compliance

The GGR01 is designed for integration into optical benches, monochromators, spectrometers, and custom interferometric setups. Its mechanical ruling architecture complies with common alignment protocols defined in ISO 14132-2 (optical instrument interfaces) and ANSI/OEOSC OP1.002 (grating mounting standards). While not individually certified to ISO/IEC 17025, each batch undergoes incoming inspection for groove density uniformity (±0.2 lines/mm), blaze angle deviation (±15 arcmin), and diffraction efficiency mapping at specified wavelengths. The aluminum/dielectric coating meets MIL-C-48497A for corrosion resistance under ambient lab conditions (23°C, 50% RH). No RoHS exemptions apply; all materials are fully compliant with Directive 2011/65/EU.

Software & Data Management

As a passive optical component, the GGR01 requires no embedded firmware or driver software. However, its performance parameters—including blaze wavelength, groove density, dispersion, and efficiency curves—are fully compatible with industry-standard optical design platforms: Zemax OpticStudio (via user-defined surface scattering models), CODE V (as GRATING object type), and FRED (importable as ASCII-based grating profile files). All product-specific data sheets include tabulated diffraction efficiency vs. wavelength curves and angular dispersion values referenced to standard Littrow configuration. Traceability documentation (batch ID, ruling date, metrology report summary) is provided digitally in PDF format upon request, supporting GLP-compliant record retention per 21 CFR Part 11 Annex 11 guidelines when stored within validated document management systems.

Applications

• CO₂ laser cavity optics and external beam combiners (10.6 µm, 75–150 lines/mm variants)
• Vacuum ultraviolet monochromators for synchrotron beamlines (30 nm, 300 lines/mm, low-scatter configuration)
• Near-infrared spectroscopy modules in process analytical technology (PAT) systems (1000 nm, 300 lines/mm, high-efficiency blaze)
• Calibration references for wavelength accuracy verification in OEM spectrometer assemblies
• Teaching laboratories for fundamental diffraction and interference experiments (visible/NIR variants with 300 lines/mm)
• Custom pulse compressor stretcher units in ultrafast laser systems where groove phase error must remain below λ/20 PV

FAQ

Is the GGR01 suitable for use in ultra-high-vacuum (UHV) environments?

Yes—when specified with optional UHV-compatible aluminum coating (no organic outgassing layers) and cleaned per ASTM E2042, the GGR01 has been successfully deployed in UHV spectrometers down to 1×10⁻⁹ Torr.
Can I specify custom groove density or blaze angle?

Custom ruling is available for minimum order quantities of 10 units; lead time extends to 12 weeks from design freeze and requires submission of interferometric groove profile specifications.
What mounting interface is recommended for thermal stability?

Kinematic mounts with Invar or ceramic baseplates are advised; coefficient of thermal expansion mismatch between float glass (8.5×10⁻⁶/K) and aluminum (23×10⁻⁶/K) must be accommodated in mechanical design.
Does the grating require periodic recalibration?

No—ruled gratings are physically stable optical elements with no drift mechanisms; efficiency and angular performance remain invariant over time unless exposed to mechanical abrasion or laser-induced damage.
Are test reports traceable to NIST or national metrology institutes?

Groove density and blaze angle measurements are performed using a calibrated He–Ne interferometer referenced to NIST-traceable wavelength standards; full calibration certificates available upon request.