BK7 Optical Glass Wedge Prism
BK7 wedge prism is an optical component made of BK7 optical glass, featuring a wedge-shaped structure (two flat surfaces tilted at a slight angle). It is primarily used for beam deflection, collimation, or optical system alignment in the visible to near-infrared (NIR) wavelength. When is a BK7 (K9) wedge prism the more suitable choice? The working band is visible(400-700 nm) or near-infrared (700-2000 nm). The budget is limited and no ultraviolet or ultra-high thermal stability is required. It is used for low-power laser or ordinary optical adjustment (such as laboratory optical path calibration). Comparison of optical performance between fused silica wedge prisms and BK7(K9) wedge prisms Optical Glass BK7: Transmission Range: 350 nm - 2.0 μm (VIS is dominant) Optical Glass BK7: UV transmittance@200nm: <10% (strong absorption) Optical Glass BK7: Refractive Index@587.6nm: 1.517 Optical Glass BK7: Dispersion (νd): 64.2 (moderate dispersion) Optical Glass BK7: Birefringence: No (isotropic) Optical Glass BK7: Laser Induced Damage Threshold: Relatively low (especially prone to damage in the ultraviolet band)
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