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Fused Silica Right Angle Prism
Fused silica right angle prisms are made of high purity fused silica with excellent optical performance and environmental stability for UV, VIS and NIR wavelengths, especially suitable for laser systems, high precision optics and harsh environments.
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Fused Silica Material Properties
Parameter Characteristic
Transparent Range 180nm (deep UV) - 2.2µm (NIR)
Refractive Index (@587nm) ~1.458
Thermal Expansivity 0.55 × 10⁻⁶ /K (near zero expansion)
Heat Stability Excellent (resistance to sudden changes in temperature)
Laser Induced Damage Threshold High (suitable for UV and high power lasers)
Chemical Stability Resistant to acids, alkalis and corrosion
Radiation Resistance Suitable for space and nuclear environments


Comparison of Fused Silica & BK7 Right Angle Prisms
Characteristic Fused Silica Right Angle Prisms BK7 Right Angle Prisms
Transparent Range 180nm – 2.2µm 350nm – 2.0µm
Ultraviolet Performance Excellent (deep UV applicable) Poor (<350 nm strong absorption)
Heat Stability Very low thermal expansion (0.55 x 10-⁶/K) Higher thermal expansion (7.1 x 10-⁶/K)
Laser Induced Damage Threshold High (suitable for excimer laser and femtosecond laser) Medium low (suitable for He-Ne and visible lasers)
Cost comparatively high comparatively low

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