Laser beam conditioning
Prisms: Substrate, coating band and surface figure set the transmitted or reflected wavefront, and the damage threshold sets the power the optic can carry.
Prism types
| Prism | Description |
|---|---|
| Right-angle prism | Typically used to bend image paths or to redirect light at 90°. Using the critical angle, total internal reflection of the incident light is one of its basic functions. Easy to install, with good stability and strength against mechanical stress, so suited to all kinds of devices and instruments. |
| Roof prism | Reverts and inverts the image as well as bending the optical path by 90°. Its smaller size lets the objective and eyepiece sit in a line, suiting compact binoculars and telescopic systems. |
| Powell prism | A line generator that displays a uniform straight reference line for alignment, machine-vision systems, construction and process control. Also usable with lower-power lasers. Available in fan angles of 5°, 7°, 10°, 30°, 45°, 60°, 75°, 90° and 100° for custom applications, at all wavelengths. |
Common specification (right-angle prisms)
| Parameter | Value |
|---|---|
| Substrate Material | H-K9L/ N-BK7/ Fused Silica |
| Dimension Tolerance | ±0.1mm |
| Thickness Tolerance | ±0.15mm |
| Surface Quality | 20-10/40-20/60-40 |
| Decentration | <3′ |
| Clear Aperture | >90% |
| Surface Flatness | λ/10@632.8nm |
| Uncoated Wavelength Range | 400 nm - 700 nm |
Specification
| Parameter | Value |
|---|---|
| Material | K9, fused silica |
| Product application | Telescopic systems, imaging systems and range-measurement systems |
Application context
Why this design is used
Application fit depends on the ordered configuration; catalog values are separated from fields that still require confirmation.
Spectroscopy and fluorescence
Prisms: Edge steepness, blocking depth and passband transmission at the working angle decide how well the excitation is separated from the signal.
Engineering reference
Specify Prisms from the interfaces inward
Prisms is a configurable free-space optical component in the Optics, filters and coatings family. The final part number should be released only after the optical, mechanical, electrical and environmental fields below are matched to the intended instrument.
A free-space optic is specified by the wavelength band and angle of incidence its coating is designed for, the clear aperture the beam actually uses, and the substrate, surface quality and damage threshold the application demands. Catalogue figures are quoted at a reference wavelength and angle; performance shifts away from them.
Selection guidance describes the engineering fields that must be checked. It does not assign an option-dependent value that is absent from the catalog record.
Configuration fields to confirm
- Wavelength and coating band
- State the operating wavelength or band and whether anti-reflection, high-reflection, edge or notch behaviour is required there.
- Angle of incidence and polarization
- Confirm the working angle and input polarization; coating bands and splitting ratios move with both.
- Size and clear aperture
- Size the optic from the beam diameter at that plane, including the margin the mount consumes, and state diameter, thickness and tolerances.
- Substrate and surface quality
- Choose substrate material, surface quality, flatness or figure and centration against the wavefront error the system allows.
- Power handling
- Provide average and peak power, beam diameter and pulse duration so the damage-threshold margin can be checked.
- Mounting and environment
- Confirm mount type, orientation, temperature, humidity and cleaning constraints of the coating.
Qualification sequence
- 1Define the measurement objective and the performance limit that Prisms must satisfy.
- 2Freeze wavelength, mechanical, fiber and electrical interfaces before selecting option codes.
- 3Check loss, noise, heat, motion or vibration contributions in the complete system budget.
- 4Confirm the final drawing, pinout, environmental suffix and acceptance test with the quotation.
Technical FAQ
Configuration questions for Prisms
What must be specified before ordering Prisms?
Confirm wavelength and coating band, angle of incidence and polarization, size and clear aperture, substrate and surface quality, power handling, and mounting and environment. These fields are coupled, so the final part number should be checked against the complete instrument rather than selected from the model name alone.
How should Prisms be integrated into the system?
A free-space optic is specified by the wavelength band and angle of incidence its coating is designed for, the clear aperture the beam actually uses, and the substrate, surface quality and damage threshold the application demands. Catalogue figures are quoted at a reference wavelength and angle; performance shifts away from them. Freeze the optical, mechanical and electrical interfaces before releasing the surrounding assembly.
Which documentation should be approved for Prisms?
Approve the configuration-specific specification, mechanical drawing, connector or pinout definition, environmental suffix and acceptance-test limits supplied with the quotation. Any field absent from the local record remains a confirmation item, not an assumed capability.