Extreme UV-Blocking Filters

Ocean Thin Films UV-Guard™ XB filters are high performance dichroic filters with extremely high blocking for ultraviolet radiation and optional IR blocking characteristics. The outstanding UV blocking is achieved with a combination of tailored dichroic coatings produced with OTF’ proprietary sputter depostion technology. Standard borosilicate glass substrates are used for UV-Guard™ XB. The UV blocking levels of UV-Guard™ XB filters are similar to UV-absorption glass, without high substrate cost and temperature dependent spectral performance. UV-Guard™ XB dichroic filter coatings can be applied on flat shaped customer specific substrates including flyeye lens.

BENEFITS:
• Extremely high UV-rejection (typ better than 10-5), similar to UV-absorption glass
• Superior optical stability at higher operating temperatures
(spectral stability typ. <0.7nm/100°C)
• Very narrow cut-on/cut-off edge tolerances (< ± 1%)
• Very steep cut-on slopes available
• High transmission for visible light
• Excellent spectral uniformity and stability under varying environmental conditions
(spectral shift typ. <0.5 nm)
• High volume production capabilities
• Engineering support for custom designed UV Blocking filters

APPLICATIONS:
UV-Guard™ XB filters are specially designed for applications which require extraordinary blocking of UV
radiation. Typical applications are in tLCD and LCOS
based projection display systems:
• Primary UVIR filter at UHP lamp
• Secondary UV filter for blue channel
Other applications which involve UV-sensitive optical components in insturmentation and sensors

Schematic of UV Blockers


1. Lamp with reflector
2. UV Blocker filter
3. Blocked UV radiations
4. Blocked IR radiation
5. Transmitted visible light