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21 August 2024 Ultrafast laser welding of x-ray mirror segment stacks
Brody D. McElwain, Ian J. Arnold, Adel Al-Ghazwi, Kevin Laverty, Chang-Jin Oh, Paola Luna, Brandon D. Chalifoux
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Proceedings Volume 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray; 130935A (2024) https://doi.org/10.1117/12.3020781
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan
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Abstract
Designing and building X-ray telescopes that observe the high-energy universe with large-effective area and sub-arcsecond angular resolution has proven to be a great optomechanical challenge, as thin, tightly nested grazing-incidence mirrors are easily deformed during assembly. We are developing a bonding and alignment process in which we fabricate spacers, bond them between thin mirrors, and re-align these mirrors after assembly, using a Hartmann test for alignment metrology. We implemented a non-contact slumping method to produce smooth Corning Eagle XG conical mirrors. Using an ultrafast laser, we welded fused silica spacers to flat fused silica mirrors to create mirror segment stacks. We performed a parameter study on ultrafast laser welding Eagle XG to fused silica, which we expect to enable building an X-ray mirror segment stack with our slumped Eagle XG mirrors and fused silica spacers.
© (2024) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Brody D. McElwain, Ian J. Arnold, Adel Al-Ghazwi, Kevin Laverty, Chang-Jin Oh, Paola Luna, and Brandon D. Chalifoux "Ultrafast laser welding of x-ray mirror segment stacks", Proc. SPIE 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 130935A (21 August 2024); https://doi.org/10.1117/12.3020781
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KEYWORDS
Ultrafast lasers
Mirrors
X-rays
Laser bonding
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