thomas mooney, walt pawlewicz, mick merrill, dave leclerc, kerry
TRANSCRIPT
ABSTRACT Optical coatings are key elements of any optical system. In the past several
years, driven by increasing sizes of planned telescopes, a need has arisen for much larger high performance filters and coatings. The performance of coated optics must approach theoretical limits - and now, over very large areas. The
Implications for coating large and expensive optics are that the equipment must not only accommodate a large optic, but the process must achieve excellent
uniformity over large areas and exhibit excellent performance, reproducibility and reliability. We describe a purpose-built lab to address these challenges and
present achieved results.
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New Facility for Manufacturing and Testing very Large Narrow Bandpass Filters and Other High Performance Optical Coatings
Thomas Mooney, Walt Pawlewicz, Mick Merrill, Dave Leclerc, Kerry Hurd
Current Coating Results
Exceptional CWL and BW uni-formity
Very high transmittance Excellent blocking
Single rotation substrate system, 1.4 m substrate holder
Rotating system can hold a 500lb optic Required to rotate a 200lb optic up to 200RPM
1.4 meter capacity Narrow BP filters in 75 cm sizes Deposit oxides, nitrides, metals
Custom metrology system Measure UVNIR filters 750 mm diameter and 22 mm
thickness Two distinct subsystems -Motion control selects measurement area -spectrometer metrology performs transmission measurement
Safe and reproducible cleaning without automation Cleaning solution fed via handheld nozzles while optic
rests on a fixture Water temperature and pressure can be controlled
and varied
New facility & Equipment Goal: Achieve excellent uniformity, produce low loss coatings,
and maintain durability and stability Purpose-built laboratory consisting of large optics cleaning,
custom deposition and specialized spectrometer New facility to produce NBP filters up to 750 mm diameter,
high performing dichroic beam splitters, and simple and broad coatings
BP exhibits excellent band shape and transmission
Measurements taken at 10 mm inter-vals from center to 280 mm radius
Poster # 9151-213 Materion Precision Optics; Materion.com/barroptics; [email protected]
Summary of measured uniformity of several filters recently manufactured
Deposition system specification indicated in purple, our goal in yellow
Our Target Market Segment This graphic Illustrates our target
market. Relatively large optics, but with the emphasis on excellent uniformity to enable the manufacture of large narrow
BP filters.
Future Coating Projects Rugate single and multi notches - LGS pick-off - OH suppression Ultra-hard AR coatings - Fiber manipulator plates Discrete layer multi-notch filters - OH suppression - Optical cross-correlation filters Enhanced UV mirrors - Metal based - All-dielectric
Demo for major AO system
DBS and AR coat measured at 25 degrees AOI
Very high transmittance and reflectance