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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