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Home > Products > Prisms > Penta Prisms
Infrared Penta Prism
The infrared penta prism is a critical beam-steering component in infrared optical systems. Material and coating selection must be optimized based on wavelength, power handling, and cost constraints. For high-power laser applications, ZnSe is the preferred choice, while Ge or Si is more suitable for thermal imaging systems. When customizing, key specifications such as surface figure accuracy, coating wavelength range, and environmental adaptability must be clearly defined.
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| The differences between infrared penta prisms and visible penta prisms | ||
| Properties | Infrared Penta Prism | Visible Penta Prism (BK7) |
| Material | Si/Ge/ZnSe | BK7/Fused Silica |
| Coating | Gold coating/Dielectric high reflection coating | Aluminum coating/Dielectric coating |
| Surface Accuracy | λ/4@10.6μm (~2.65μm) | λ/4@632.8nm |
| Thermal Focusing Effect | Significant (requiring compensation) | Negligible |
How to choose the material for an Infrared penta prism?
CO₂ laser systems → ZnSe prism + high reflectivity laser coating (10.6 μm, high-power resistant).
Military thermal imaging → Ge prism + gold coating (optimized for LWIR high reflectivity).
Low cost MIR applications → Si prism (with dielectric coating to enhance reflectivity).
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