Window
Optical windows protect precision sensors, lasers and lenses against dust, moisture, shock and chemicals while efficiently passing selected bands without changing magnification. Substrates include fused silica/sapphire for UV, K9 for visible, and ZnSe/germanium for IR. AR coatings can raise transmission to 99.9%. Key parameters include surface figure, parallelism, damage threshold and environmental resistance. Applications include laser processing, aerospace, medicine, sensing and communications.
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