C11514 Shortpass Filter

The C11514 passes the full cool-visible spectrum from UV through yellow-green, with its 50 % cut-off measured at 570.5 nm. Transmission peaks at 95.9 % near 544 nm - the highest peak in the entire shortpass series - and averages above 93 % from 394 to 563 nm. The blocking region engages by 592 nm with transmission dropping below 0.6 % on average through 780 nm. A gentle UV-side roll-off places the passband onset around 388 nm.

Key Advantages

• Highest peak in the series: 95.9 % – Peaks at 544 nm with the lowest insertion loss of any KUPO shortpass filter, maximizing signal throughput.
• 570 nm cut-off for full cool-visible pass – T50 % at 570.5 nm captures violet through yellow-green - everything short of orange.
• Sub-0.6 % blocking from 592 nm – Orange, red, and NIR transmission averages under 0.6 % all the way to 780 nm, with no secondary peaks.
• Hard-oxide durability – Ion-assisted sputtered coating survives high-power sources, humidity, solvents, and aggressive cleaning.
• Custom formats – Round, square, or free-form blanks from 5 mm to 450 mm, thickness 0.21-3.8 mm, on Borofloat, soda-lime, Schott D263 T, or Corning Eagle XG glass.

Typical Applications

• Broadband fluorescence excitation – Passes multiple excitation lines (405, 445, 488, 514, 532, 561 nm) in a single filter while blocking all orange-red emission.
• Daylight simulation – Trims broadband sources to approximate daylight color temperature by removing warm orange-red content.
• Multispectral imaging – Defines the cool-visible band in two-channel warm/cool multispectral camera systems.
• Horticulture & plant science – Captures photosynthetically active blue and green reflectance while blocking red and far-red wavelengths.
• White-LED optimization – Removes the warm phosphor tail from white LEDs to produce neutral or cool-white output for machine vision.

Whether you need prototypes or production volumes, KUPO Optics delivers the C11514 to your exact specifications - get in touch.