General Specifications
Membrane material – Nitrocellulose
Temperature range – -40° C to 125°C
Index of Refraction – 1.5
Surface Quality – Better than 40/20
Average 8/92 R/T Uncoated
Transmitted Wavefront typically better than 0.5 wave.
Reflected wavefront typically better than 1 wave/inch.
Film Specifications
Standard Thickness/Standard Quality (ST-SQ)
5µm (0.0002″) ±10% Thickness Uniformity ‹ 4 fringes/inch (2 waves/inch)
Standard Thickness/Laser Quality (ST-LQ)
5µm (0.0002″) ±10% Thickness Uniformity ‹ 1 fringe/inch (0.5 waves/inch)
Extra Thin Pellicles (ETP)
2µm (0.00008″) ± 10% Thickness Uniformity ‹ 1 fringe/inch (0.5 waves/inch)
Reflection Flatness/Transmitted Wavefront
Using improved manufacturing techniques NPC now provides Ultraflat Pellicles with up to 1/10 reflection on central areas of smaller diameter pellicles. Better than 1″ wave reflection flatness can be obtained on larger diameter pellicles. The central 75% to 80% central area of a circular pellicle is normally specified as the best area for reflection flatness. Computer reduced interferometric documentation can be provided.
Specially manufactured pellicles with transmitted wavefronts of better than 1/10 are available. Thickness uniformity of one fringe over large areas are also available. Computer reduced interferometric documentation can be provided.
IR Pellicle Applications
Minimal loss (typical 50/50 R/T Ave.) beamsplitting pellicles are available for selected bandwidths within the 700nm to 5µ range. Coatings can be altered for different states of polarization as well as for single wavelength applications.