Precision image rotation prisms for optical scanning, beam steering, and alignment systems
When specifying this product, these parameters most directly impact performance and cost:
| Material | N-BK7 / UV Fused Silica / CaF₂ |
|---|---|
| Size Range | 5 – 50 mm (custom sizes available) |
| Wavelength Range | Material dependent (185 nm – 2.5 μm) |
| Surface Quality | 60-40 standard; 40-20 and 20-10 available |
| Surface Flatness | λ/4 typical per surface |
| Clear Aperture | > 90% of clear face |
| Angular Tolerance | ± 3 arcmin |
| Coatings | Uncoated or AR coated for specific wavelength bands |
| Image Rotation | 1:1 ratio — prism rotation at θ rotates image at 2θ |
Parameter Reference Guide
Typical Standard capability — available as shown
Available Alternative options exist — request quotation
Custom Per your drawing — quote after review
Subject to Review Depends on project specifics
When requesting a quote for optical prisms, providing the following information helps us give you an accurate quotation:
Dove prisms are truncated rhomboid prisms used for image rotation in optical systems. Named after their inventor H. Dove (1899), these prisms rotate an image about its optical axis without lateral displacement when rotated about the optical axis.
Unlike other image-rotating prisms, the Dove prism operates with a single internal reflection. When the prism rotates by angle θ, the image rotates by 2θ, providing precise angular control. This makes them essential in optical scanning, target simulation, beam steering, and precision alignment systems.
Select the optimal substrate material based on your wavelength, environment, and budget requirements.
| Material | Transmission | Key Advantage | Considerations |
|---|---|---|---|
| BK7 | VIS / NIR (350-2000nm) | Low cost, standard optical glass | No UV below 350nm |
| UV Fused Silica | UV / VIS / NIR (185-2100nm) | UV-compatible, high LIDT | Higher cost |
| CaF₂ | UV / VIS / IR (180nm-8μm) | Broadband, low birefringence | Softer, careful handling |
Multi-wavelength AR coating for VIS or NIR bands. R < 0.5% per surface.
Ideal for broadband imaging and scanning systemsOptimized for a specific laser line (e.g., 532nm, 633nm, 1064nm). R < 0.25%.
Best for laser-based alignment and scanningRaw prism surfaces. Suitable for non-critical alignment and educational use.
Acceptable when throughput is not criticalDove prism rotates image by 2θ when prism rotates by θ. This 2:1 ratio must be accounted for in scanning system calibration.
The usable aperture is limited by the prism face width. Ensure beam diameter does not exceed ~60% of the prism face to avoid vignetting.
Dove prisms introduce astigmatism in converging beams. Use in collimated space or add compensating optics for focused systems.
Mount in a precision rotation stage with the optical axis aligned through the prism center. Kinematic mounts recommended for scanning applications.
Rotating Dove prisms scan images across detector arrays for target simulation and surveillance.
Precise angular control of laser beams for alignment, marking, and material processing systems.
Image orientation correction in automated optical inspection and semiconductor wafer analysis.
Periscopes, rangefinders, and optical test benches requiring controlled image rotation.
Contact us for exact pricing based on your specifications.
Specification Parameters
Typical Specifications shown on this page are standard capabilities. Available Options include alternative materials and coatings. Custom Specifications are available per your drawing. Requirements beyond standard capability are marked Subject to Engineering Review.
When a Dove prism is rotated about its optical axis by angle θ, the internal reflection causes the image to rotate by 2θ. This provides precise, continuous image rotation without lateral beam displacement.
Standard materials include N-BK7 for visible applications, UV Fused Silica for UV-VIS-NIR, and CaF₂ for broadband UV-IR. Custom materials available upon request.
Dove prisms introduce astigmatism in converging beams. They work best in collimated optical paths. If converging beam use is required, consult our engineering team for compensation options.
The beam should not exceed approximately 60% of the prism face width to avoid vignetting at the internal reflection surface. Specify your beam diameter for our recommendation.
60-40 for standard applications, 40-20 for precision, and 20-10 for laser-grade optics. Surface quality directly affects scatter and throughput.
Custom optics require engineering evaluation. Lead time is confirmed with your quotation.
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