Case study: 900 nm Narrow Band Pass Filter

Case Study: Extending Spectral Blocking Range with Material Selection:

Customer Challenge: Vortex undertook a project to develop of a 900 nm narrow bandpass filter with extended blocking to be fitted to an IR camera. While there were no significant process development issues, it highlights the importance of substrate choice to assist blocking requirements and keep costs within a budget. When manufacturing optical filters, the substrate makes up a much smaller percentage of the cost, coating it is usually the more expensive part. With our extensive knowledge of potential substrates for different applications, Vortex are well placed to offer advice on these budget challenges.

Vortex’s Solution: In this project, Vortex utilised the properties of 3 mm Schott RG9 glass to enhance the spectral blocking performance of the 900 nm narrow bandpass filter. By carefully selecting the correct substrate thickness, most of the blocking for this filter was due to the Schott RG9. This saves hours of coating time and more importantly the customer’s money! The graph below shows how Schott RG9 compliments this 900 nm narrow band pass filter.

The Result: Cost budget, light budget and extended blocking all satisfied! By delivering cutting-edge solutions that leverage advanced materials knowledge, Vortex continues to drive innovation in optical filter technology, providing customers with tailored solutions.