Materion Optics Balzers has been providing optical coatings for space exploration, both ground and space based for over 40 years. MBO’s Large Area Optics (LAO) laboratory, designed and brought online in 2012 continues to improve and enhance capabilities in providing bandpass filters (narrow and wide), edge filters, AR coatings, dichroic beamsplitters, enhanced mirrors and notch filters. This paper intends to demonstrate our improvements over the past decade to manufacture precision, high performance optical interference filters up to 1.4M in diameter. MBO’s purpose-built LAO laboratory includes a custom spectrophotometer, deposition system and substrate cleaning setup. All self-contained in an ISO 6/7 clean room. Previous and current efforts include items for Large Synoptic Survey telescope (LSST), Very Large telescope (VLT), Hyper Suprime Camera (HSC), Visible Tunable Filter (VTF), SkyMapper Telescope as well as many others.
Multispectral earth observation is done using selected discrete filter channels. The optical filtering is typically accomplished using optical thin film filters. These filters can be placed in filter wheels or as an array directly in front of the detector. For compact system designs filter arrays are preferred. The manufacturing of filter arrays can be done by two different approaches called monolithic array and butcher block. Typical optical requirements for such filters are for example a filter transmission of above 90% and an out-of-band blocking in OD6 range.
Materion Balzers Optics (MBO) has been providing optical coatings in the LWIR range for over 40 years. Our technology and capability have advanced significantly over that time. This presentation intends to demonstrate our heritage and capability to manufacture complex optical coatings up to 20um for space and terrestrial applications on a wide range of substrates. These coatings include dichroic beamsplitters, narrow bandpass filters, high performance ARs, as well as edge filters and mirrors. This paper will also include preliminary information on our roadmap 50um capability. Additional presentation content can be accessed on the supplemental content page.
As larger and larger telescopes continue to come online and become operational the demand for large optical coatings such as Anti-Reflection (AR) coatings, Band Pass (BP) filters (wide & narrow), mirrors and Dichroic Beamsplitters (DBS) continues to grow. Materion’s Large Area Optics (LAO) laboratory provides capabilities matched by few other facilities in the world. With a demonstrated capability up to 1.4M we provide high performance optical interference filters in sizes much larger than those previously available. All components of the Materion LAO lab were custom designed and built to Materion performance requirements, including a large spectrophotometer, deposition system and substrate cleaning station. All in an ISO 6/7 clean room environment. Previous and current efforts include items for Large Synoptic Survey telescope (LSST), Very Large telescope (VLT), Hyper Suprime Camera (HSC), Visible Tunable Filter (VTF), SkyMapper Telescope as well as many others. This poster intends to demonstrate Materion capability and expertise.
The Bandpass Filters in the NIRCam instrument are required to have high throughput in bandpass spectral region and excellent
out-of-band blocking over the entire region of detector spectral response. The high throughput is needed for the instrument to have high sensitivity for detecting distant galaxies, and the out-of-band
blocking is needed for accurate calibration on James Webb Space Telescope. The operating temperature of the instrument is at cryogenic temperature from 32 Kelvin to 39.5 Kelvin. We have performed spectral measurement of NIRCam bandpass filters at cryogenic temperature after three cryo-to-ambient cycles. We will report the experiment and results in this paper. This work was performed and funded by NASA Goddard Space Flight Center under Prime Contract NAS5-02105.
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