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P13552 Background Research: Non Stick Surface Materials This document outlines characteristics of various materials that the design team is considering for initial testing. Candidate materials for Transmissive UV optics include Fused Silica, Quartz, Vycor, some formulations of Pyrex, Sapphire and a variety of fluoride compounds. Height errors must be very tightly controlled for good optics. Fused Silica (Suprasil, Spectrosil, Lithosil, etc.,) Pros: Cheap UV to 200 nm and through visible light spectrum UV Grade Fused Silica is synthetic amorphous silicon dioxide of extremely high purity. This noncrystalline, colorless silica glass combines a very low thermal expansion coefficient with good optical qualities, and excellent transmittance in the ultraviolet region down to 195 nm. Transmission and homogeneity exceed those of crystalline quartz without the problems of orientation and temperature instability inherent in the crystalline form. P13552 Background Research: Non Stick Surface Materials Crystal Quartz/ Fused Silica It has good transmission from the vacuum UV to the near infrared. Due to its birefringent nature, crystal quartz is commonly used for wave plates. Birefringence is the optical property of a material having a refractive index that depends on the polarization and propagation direction of light. P13552 Background Research: Non Stick Surface Materials P13552 Background Research: Non Stick Surface Materials http://www.technicalglass.com/fused_quartz_transmission.html Ordering: http://www.technicalglass.com/product_pages/machined_quartz/polished_items_plates_discs.html Calcium Fluoride n=1.46 Down to 130nm UV performance decreases over time due to water absorption Soft and brittle Calcium fluoride can be used without an Anti-Reflection coating due to its low index of refraction. P13552 Background Research: Non Stick Surface Materials Magnesium Fluoride Single layer coating film n =1:38 Performance isn’t effected by water MgF2 is another excellent choice for deep UV to infrared regions, with good transmission range from 0.15 µm to 6.5 µm MgF2 is one of the lowest index infrared materials, which usually doesn’t require anti-reflection coating. MgF2 is extremely durable compared to other materials which are transparent from the UV to the IR spectrum. P13552 Background Research: Non Stick Surface Materials Sapphire High cost UV cutoff= 143 Very hard P13552 Background Research: Non Stick Surface Materials Plexiglass: Borofloat glass versus regular Soda-Lime glass P13552 Background Research: Non Stick Surface Materials B270 Superwite http://www.pgo-online.com/intl/katalog/B270.html Visible light P13552 Background Research: Non Stick Surface Materials Teflon film (Polytetrafluoroethylene (PTFE)) a fluorocarbon http://www2.dupont.com/Teflon_Industrial/en_US/assets/downloads/h55008_FEP_Film_Properties_Bu lletin.pdf Would need to be attached to build surface P13552 Background Research: Non Stick Surface Materials P13552 Background Research: Non Stick Surface Materials Good materials website index of refraction for http://www.newport.com/Optical-Materials/144943/1033/content.aspx These graphs compare the transmission of standard optical materials. The transmission values listed here are equivalent to "external transmittance" and takes into consideration the reflectances you get from uncoated optical elements. Transmission of 10 mm thick fused silica, BK7, and crown glass windows. P13552 Background Research: Non Stick Surface Materials Corning Vycor (7913) N= 1.458 at a wavelength of 589 nm P13552 Background Research: Non Stick Surface Materials Corning 1737 AMLCD Glass Substrate Bulb/Projector Sharp PG MB60X Lamp type: 200w DC http://www.aboutprojectors.com/Sharp-AN-MB60LP-lamp.html http://www.mv.helsinki.fi/aphalo/photobio/lamps.html As per Texas Instruments DMD specs, working belo 400nm, right where the near UV range starts is detrimental to the DMD chips. The most damaging process results through outgassing of sealants in the micromirror array. This is the reason why DLP projectors have internal UV filters, generally included in the UHP lamp rack. http://www.optics.arizona.edu/optomech/student%20reports/tutorials/Tutorial1_james%20Johnson.pd f