BK7 Optical Glass Penta Prism
The BK7 penta prism is a cost-effective optical path deflection component for the visible light spectrum, suitable for imaging, measurement, and low-power laser systems. For UV or high-power laser applications, a fused silica penta prism is recommended. FAQ about BK7 penta prism Q1: Can BK7 penta prisms be used with UV lasers? → Not recommended. BK7 exhibits strong absorption in the <350nm wavelength. For UV applications, use a fused silica penta prism instead. Q2: Is coating necessary? → If the angle of incidence exceeds the critical angle (about 41° for BK7), no coating is needed. Otherwise, a high-reflectivity (HR) coating is required. Q3: Can it handle high-power lasers? → Suitable only for low-power lasers (<1 W CW). For high-power applications, consider fused silica prisms or those with laser-grade HR coatings. Comparison between BK7 penta prism and fused silica penta prism BK7 Penta Prism: Transmission range: 350nm - 2.0μm BK7 Penta Prism: Ultraviolet performance: Poor (strong absorption below 350nm) BK7 Penta Prism: Thermal stability: Generally (with higher thermal expansion) BK7 Penta Prism: Laser damage threshold: Lower (5J/cm² @1064nm, 10ns) BK7 Penta Prism: Cost: Lower BK7 Penta Prism: Applicable scene: Conventional applications of visible
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