Bote Optics provides various specifications of off-axis parabolic mirrors
- Use aluminum film substrate reflector
- Available in 15°, 30°, 45°, 60° or 90° off-axis options
- Aluminum film, silver film and gold film can be selected
- The difference from standard parabolic reflectors is that off-axis parabolic metal film reflectors can direct and concentrate incident parallel light at a specific angle, and maintain a stable performance. Limited focus. These reflectors are commonly used as collimators for Schlieren and MTF systems, while gold-coated off-axis parabolic reflectors are used in FLIR test systems.
- NOTE: Due to the 175A surface roughness, this mirror is not suitable for visible and UV applications requiring low scattering.
| Off-axis Angle | 15°, 30°, 45°, 60°, 90° |
| Diameter(mm) | 1”, 2”, 3”, 4” |
| Diameter Tolerance(mm) | +0.00/-0.38 |
| Focal length tolerance % | 士1 |
| RMS | 1 lamda |
| PFL (mm) | 0.5′, 1”, 1.5′, 2”, 3”, 4” |
| EFL (mm) | 1“, 2“, 3“, 4“, 5”, 6”, 7”, 8” |
| Surface roughness | <175 RMS |
| Substrate | Aluminum 6061-T6 |
| Coating | Protective gold film/aluminum film |
| Wavelength range (um) | 0.7-20 |
- Diameter
Off-axis parabolic metal reflectors are generally prototypes, and the diameter is the overall size. The 1-inch (25.4mm) off-axis reflector is made of 1-inch cylindrical metal cutting, and the 2-inch off-axis reflector has a base diameter of 2 inches (50.4mm). - Focal length (negative focal length, effective focal length)
The focal length of off-axis parabolic mirrors is divided into negative focal length and effective focal length. Usually the default focal length refers to the effective focal length. The effective focal length is usually defined in inches. The focal length of standard off-axis parabolic mirrors is generally 1 inch, 2 inches, 3 inches, 4 inches and 6 inches.
- Off-axis angle
The off-axis angle is an index that reflects the propagation direction of the beam through the off-axis parabolic mirror. The off-axis angle of the off-axis parabolic metal reflector is generally 90″, and for dry off-axis parabolic mirrors, it is 90%. The propagation of the collimated beam The axis should be perpendicular to the base to achieve ideal focusing. Other off-axis angles can also be set if special designs are made. - Coating
Generally, they are gold-plated film, silver-plated film and aluminum-plated film. There are also some special coatings, such as UV-enhanced aluminum coatings.
5.Whether to punch holes?
Off-axis parabolic mirrors with small holes mainly analyze excitation signals (laser or electron beams) and terahertz waves, for example 1) where two beams of light need to propagate collinearly in space; 2) where the central beam or electron beam needs to not be reflected occasion. The base of these mirrors has a central aperture that allows a beam of light to travel collinearly with the beam focused by parabolic reflection from the mirror.