Holographic gratings price

The price of holographic gratings is primarily driven by groove density (lines/mm), spectral range (UV, Visible, or IR), and diffraction efficiency. Higher groove densities (e.g., 2400 lines/mm or 3600 lines/mm) require more precise laser interference setups, increasing the cost. Additionally, the substrate material (such as BK7 glass, UV-grade fused silica, or Zerodur) significantly impacts the price due to thermal stability requirements. You should also specify the stray light level; holographic gratings are prized for their low stray light compared to ruled gratings, and lower tolerance levels will command a premium price.

Standard gratings usually feature Aluminum (Al) coatings, which are cost-effective for general use. However, if your application requires high reflectivity in specific bands, you may need Gold (Au) or dielectric coatings, which increase the unit price. For industrial or outdoor applications, ensure the supplier provides protective overcoatings (like MgF2 or SiO2) to prevent oxidation. Compliance with RoHS and REACH standards is also a factor that reputable suppliers on Made-in-China.com will include in their quality assurance pricing.

Standard catalog sizes (e.g., 12.5mm, 25mm, or 50mm squares) are significantly cheaper due to mass production. Custom dimensions or non-standard blaze wavelengths involve high setup costs for the master grating production. For B2B buyers, it is often more economically feasible to design optical systems around standard grating sizes unless the order volume exceeds 500+ units, where the cost of a custom master can be amortized.

The main risks include transportation damage and specification mismatch. Optical gratings are extremely sensitive to humidity and physical shock. Ensure the supplier uses vacuum-sealed cleanroom packaging and robust outer cushioning. To mitigate specification risks, always request a Zygo interferometer test report or a diffraction efficiency curve before the final shipment to verify that the product meets the technical datasheet.

Focus on long-term volume forecasts rather than a single spot purchase. Suppliers are more likely to offer a 15-25% discount if you sign a blanket purchase order (BPO) with scheduled releases. Additionally, clarify the Incoterms early; for high-value optics, CIF (Cost, Insurance, and Freight) is often preferred to ensure the supplier handles the insurance for these fragile items until they reach your port.

Utilize Secured Trading services provided by Made-in-China.com to ensure payment is only released upon confirmation of receipt and inspection. For large-scale industrial orders, consider a third-party pre-shipment inspection (PSI) to verify the groove integrity and coating uniformity under a microscope, ensuring the goods align with international trade quality standards before they leave the exporter's country.