Since the hardness of sapphire is second only to diamond, and its structural strength is very high, the thickness of the sapphire window made by enhanced light transmittance is thinner than that of the general high-dielectric window. In terms of chemistry, sapphire is a single crystal of aluminum oxide (Al2O3), which is very suitable for transmission between 0.15 and 5.5 μm.
The window is a flat plate with two parallel or wedge-shaped surfaces, and is usually used as a protective window for electronic sensors or external environment detectors. The window does not change the magnification of the system. Substrate materials include various sapphire, optical glass, K9, ultraviolet fused silica, infrared fused silica, and calcium fluoride (CaF2), magnesium fluoride (MgF2), zinc selenide (ZnSe), germanium (Ge), silicon (Si) And other crystal materials, and provide various optical coatings such as anti-reflection coatings, high-reflection coatings, spectroscopic coatings, and metal coatings. Broadband antireflection coatings can be used in the ultraviolet, visible, near-infrared and mid-infrared bands.
|Ep6 erbium-doped laser glass|
|Stimulated emission section||10-20cm2||0.8|
|Nonlinear refiractive index||10-13e.s.u||1.2|
|Temperature coefficient of refractive index||(10-6/℃}(20~100℃）||4.7|
|Temperature coefficient of thermal expansion||(10-6/℃}(20~100℃）||10|
|Long optical path temperatrue||(10-6/℃}(20~100℃）||0.64|
|Coefficient of thermal expansion||（10-6/℃}(100~Tg℃）||13|
|Chemical stability||(weight loss in distilled water at 85℃)||70|
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