K9 Prism
K9 silicate-glass prisms offer economical pricing and easy processing, making them a mainstream visible-band choice. Prism-material comparison. Material | refractive index n | transmission band | thermal expansion coefficient (×10⁻⁶/°C) | laser damage threshold | typical applications | cost. BK7 optical glass | 1.517 @587nm | 350nm-2.1μm | 7.1 | 5J/cm² @1064nm | telescopes, microscopes, laser collimation | $. Fused silica (FS) | 1.458 @587nm | 180nm-2.5μm | 0.55 | 15J/cm² @1064nm | UV lasers, space optics | $$. Calcium fluoride (CaF₂) | 1.434 @587nm | 180nm-8μm | 18.9 | 3J/cm² @1064nm | deep-UV lithography, infrared spectrometers | $$$. Zinc sulfide (ZnSe, as named in the source) | 2.4 @10μm | 600nm-16μm | 7.1 | 0.5J/cm² @10.6μm | infrared thermal imaging, CO₂ laser processing | $$. Plastic (PMMA) | 1.49 @587nm | 400nm-1.6μm | 70 | 0.1J/cm² @1064nm | consumer electronics, low-cost optical toys | $. Main material differences concern transmission band, mechanical/chemical stability, and cost. Sapphire/silica suit harsh environments or broadband UV/IR use. K9 glass is the economical first choice but limited to visible light. Calcium/barium fluorides serve high-end deep-UV or mid-/far-IR applications but are expensive and easily damaged.
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