Custom RugateNotch Filters

Barr precision optics& thin film coatings

Custom Rugate Notch Filters
Custom-designed Rugate notch filters are available from Materion
for use in a wide variety of spectroscopically-based and laser-based
applications. In contrast to conventional notch filters made with
dielectric-stack technology, Materion’s Rugate notch filters offer
effective optical reflection within the notch, while retaining hightransmission over a broad spectral range. Rugate notch filters canbe designed as single-line or multi-line notch filters. They can bedesigned for use at any incident angle and show extremely robust
environmental durability characteristics.

Representative Applications for Rugate Notch Filters:nFluorescence-based instruments for effective rejection
or reflection of single- or multiple laser linesnEye-safe applications in Ophthalmic-related instrumentation,
for providing effective laser attenuation at pre-selected
laser lines while ensuring high, largely color-neutral transmission
in the visible spectrumnRaman Spectroscopy applications; for effective Rayleighline rejection

A Rugate filter has a continuous variation in refractive index following a prescribed profile. Adjusting the index profile places notches ofindependent optical density and bandwidth anywhere within thetransmission region of the materials used in the fabrication of thefilter.

nImage-quality Astronomy-related applications requiring high 		transmission over a broad spectral range, with simultaneous
rejection of a narrow wavelength band or bands.

Materion’s capability to produce Rugate notch filters with acontinuous variation in refractive index avoids material constraints
imposed by use of more traditional thin film designs and may provide solutions to some of your more challenging opticalrequirements.
Transmission (%)

1064nm Rugate Notch Filter

Wavelength (nm)Materion Barr Precision Optics & Thin Film Coatings is a leading
manufacturer and supplier of precision optical filters, hybrid circuits, flexible thin films
and custom thin film coating services. We offer coating solutions for manufacturers in
the defense, commercial, space, science, astronomy and thermal imaging markets.

Rugate Notch Filter Features:nAvailable as single-line or multi-line notchn

Wavelength position of notch or notches can be preset

2-Line Rugate Notch Filterto user-specified valuesnCan be designed for both normal incidence andEither high reflectance (> 99.9%) within the notch or deep 		
blocking, up to OD 6 achievable

nSuitable for use over wide operating temperature range( - 200°C to + 200°C)n

Can be constructed with minimal wavefront distortion

Optical Density

nTransmission (%)

non-normal incidence applications

to be suitable for imaging applicationsn

Can be fabricated in a wide variety of shapes and sizesnOffer extremely robust environmental durability
characteristicsn

Custom Rugate Notch Filters can presently be fabricatedwithin the spectral region from the UV to the near-IRWavelength (nm)Materion is a global advanced materials company, dedicated to providing solutions that enable our customers’ technologies and drive their growth. Our products include
precious and non-precious specialty metals, precision optical filters, inorganic chemicals and powders, specialty coatings, specialty-engineered beryllium alloys, beryllium
and beryllium composites, and engineered clad and plated metal systems. The Materion business is structured to enhance our ability to provide customers with innovative,best total-cost solutions.
For precision optical coating products
2 Lyberty Way
Westford, MA 01886
Phone: +1 978.692.7513

for custom Thin film coating products
153 Industrial Way
Buellton, CA 93427
Phone: +1 805.688.4949

www.materion.com/barroptics

www.materion.com/barroptics

materion corporationwww.materion.com

BPO Rugate Notch Filters Rev 02 03 ‘11