Pellin Broca Prism
Common Specifications- Dimensional Tolerances: ±0.2 mm
- Angle Tolerances: ±3 min
- Surface Flatness: λ/8
- Surface Quality: 20-10 Scratch Dig
| Item # | A | B | H | Ø |
|---|
| ADB-10 | 19.0 mm | 33.0 mm | 11.0 mm | 78° 26' | | ADB-20 | 38.0 mm | 66.0 mm | 22.0 mm | 78° 26' | | ADBU-10 | 19.0 mm | 33.0 mm | 11.0 mm | 78° 26' | | ADBU-20 | 38.0 mm | 66.0 mm | 22.0 mm | 78° 26' | | ADBV-10 | 19.0 mm | 33.0 mm | 11.0 mm | 78° 26' |
Features- Ideal for Wavelength Seperation of a Beam of Light
- Selected Wavelength Deviated by 90°
Pellin Broca Prisms can be used to separate the harmonics of a laser beam or compensate for group velocity dispersion. The light enters and exits the crystal near Brewster's angle, which minimizes reflection losses in P-polarized light. Since the beam undergoes one total internal reflection before exiting the crystal, the angle between the input and exit beams is 90° plus a small angle due to dispersion. The dispersion is less for longer wavelengths. As the prism is rotated about point A in the figure to the right, the wavelength of light that is deviated by 90° changes even though the geometry and relative positions of the input and output beams remains unchanged. | Item # | Material | Design Spectrum
λ1- λ2 | Angular Separation Between
λ1& λ2 | Aperture
(Square) | Brewsters Angle
λ1- λ2 |
|---|
| ADB-10 | N-BK7 | 380 nm - 2.5 μm | 5.42° | 10 mm | 56° - 57° | | ADB-20 | N-BK7 | 380 nm - 2.5 μm | 5.42° | 20 mm | 56° - 57° | | ADBU-10 | UV Fused Silica | 190 - 425 nm | 11.47° | 10 mm | 56° - 57° | | ADBU-20 | UV Fused Silica | 190 - 425 nm | 11.47° | 20 mm | 56° - 57° | | ADBV-10 | Calcium Floride | 180 - 250 nm | 5.23° | 10 mm | 56° - 59° |
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Selection Guide for PrismsThorlabs offers a wide variety of prisms, which can be used to reflect, invert, rotate, disperse, steer, and collimate light. Prisms are available in N-BK7, UV Fused Silica, F2, N-SF11, α-BBO, N-KZFS8, Ge, and CaF2. For prisms and substrates not listed below, please contact tech support. Beam Steering Prisms| Prism | Material | Deviation | Invert | Reverse or Rotate | Illustration | Applications |
|---|
| Right Angle Prisms | N-BK7, UV Fused Silica, Germanium, or Calcium Fluoride | 90° | 90° | No |  | 90° reflector, independent of entrance beam angle. Used in optical systems such as telescopes and periscopes. | | 180° | 180° | No |  | 180° reflector, independent of entrance beam angle. Acts as a non-reversing mirror and can be used in binocular configurations. | | Retroreflectors | N-BK7 | 180° | 180° | No |  | 180° reflector, independent of entrance beam angle. Beam alignment and beam delivery. Substitute for mirror in applications where orientation is difficult to control. | Penta Prisms
and
Mounted Penta Prisms | N-BK7 | 90° | No | No |  | 90° reflector, without inversion or reversal of the beam profile. Can be used for alignment and optical tooling. | | Roof Prisms | N-BK7 | 90° | 90° | 180o Rotation |  | 90° reflector, inverted and rotated (deflected left to right and top to bottom). Can be used for alignment and optical tooling. | Dove Prisms
and
Mounted Dove Prisms | N-BK7 | No | 180° | 2x Prism Rotation |  | Dove prisms may invert, reverse, or rotate an image based on which face the light is incident on. Prism in a beam rotator orientation. | | 180° | 180° | No |  | Prism acts as a non-reversing mirror. Same properties as a retro-reflector or right angle (180° orientation) prism in an optical setup. | | Wedge Prisms | N-BK7 | Models Available from 2° to 10° | No | No |  | Beam steering applications. By rotating one wedged prism, light can be steered to trace the circle defined by 2 times the specified deviation angle. | | No | No |  | Variable beam steering applications. When both wedges are rotated, the beam can be moved anywhere within the circle defined by 4 times the specified deviation angle. | | Coupling Prisms | Rutile (TiO2) or GGG | Variable* | No | No |  | High index of refraction substrate used to couple light into films. Rutile used for nfilm > 1.8 GGG used for nfilm < 1.8 |
* Depends on angle of incidence and index of refraction
Dispersive Prisms
| Prism | Material | Deviation | Invert | Reverse or Rotate | Illustration | Applications |
|---|
| Equilateral Prisms | F2, N-SF11, Germanium, or Calcium Flouride | Variable* | No | No |  | Dispersion prisms are a substitute for diffraction gratings. Use to separate white light into visible spectrum. | | Pellin Broca Prisms | N-BK7, UV Fused Silica, or CaF2 | 90° | 90° | No |  | Ideal for wavelength separation of a beam of light, output at 90°. Used to separate harmonics of a laser or compensate for group velocity dispersion. | | Dispersion Compensating Prism Pairs | Fused Silica, CaF2, SF10, or N-SF14 | Variable Vertical Offset | No | No |  | Compensate for pulse broadening effects in ultrafast laser systems. Can be used as an optical filter, for wavelength tuning, or dispersion compensation. |
* Depends on angle of incidence and index of refraction Beam Manipulating Prisms| Prism | Material | Deviation | Invert | Reverse or Rotate | Illustration | Applications |
|---|
| Anamorphic Prism Pairs | N-KZFS8 or N-SF11 | Variable Vertical Offset | No | No |  | Variable magnification along one axis. Collimating elliptical beams (e.g., laser diodes) Converts an elliptical beam into a circular beam by magnifying or contracting the input beam in one axis. |
Polarization Altering Prisms| Prism | Material | Deviation | Invert | Reverse or Rotate | Illustration | Applications |
|---|
| Glan-Taylor, Glan-Laser, and α-BBO Glan-Laser Polarizers | Glan-Taylor:
Calcite Glan-Laser:
α-BBO or Calcite | p-pol. - 0° s-pol. - 112°* | No | No |  | Double prism configuration and birefringent calcite produce extremely pure linearly polarized light. Total Internal Reflection of s-pol. at the gap between the prism while p-pol. is transmitted. | | Rutile Polarizers | Rutile (TiO2) | s-pol. - 0° p-pol. absorbed by housing | No | No |  | Double prism configuration and birefringent rutile (TiO2) produce extremely pure linearly polarized light. Total Internal Reflection of p-pol. at the gap between the prisms while s-pol. is transmitted. | | Double Glan-Taylor Polarizers | Calcite | p-pol. - 0° s-pol. absorbed by housing | No | No |  | Triple prism configuration and birefringent calcite produce maximum polarized field over a large half angle. Total Internal Reflection of s-pol. at the gap between the prism while p-pol. is transmitted. | | Glan Thompson Polarizers | Calcite | p-pol. - 0° s-pol. absorbed by housing | No | No |  | Double prism configuration and birefringent calcite produce a polarizer with the widest field of view while maintaining a high extinction ratio. Total Internal Reflection of s-pol. at the gap between the prism while p-pol. is transmitted. | Wollaston Prisms
Wollaston Polarizers | Calcite | Symmetric
p-pol. and
s-pol. deviation angle | No | No |  | Double prism configuration and birefringent calcite produce the widest deviation angle of beam displacing polarizers. s-pol. and p-pol. deviate symmetrically from the prism. Wollaston prisms are used in spectrometers and polarization analyzers. | | Beam Displacing Prisms | Calcite | 2.7 or 4.0 mm Beam Displacement | No | No |  | Single prism configuration and birefringent calcite separate an input beam into two orthogonally polarized output beams. s-pol. and p-pol. are displaced by 2.7 or 4.0 mm. Beam displacing prisms can be used as polarizing beamsplitters where 90o separation is not possible. | | Fresnel Rhomb Retarders | N-BK7 | Linear to circularly polarization Vertical Offset | No | No |  | λ/4 Fresnel Rhomb Retarder turns a linear input into circularly polarized output. Uniform λ/4 retardance over a wider wavelength range compared to birefringent wave plates. | | Rotates linearly polarized light 90° | No | No |  | λ/2 Fresnel Rhomb Retarder rotates linearly polarized light 90°. Uniform λ/2 retardance over a wider wavelength range compared to birefringent wave plates. |
* s-polarized light is not pure and contains some p-polarized reflections. Beamsplitter Prisms
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Pellin Broca Prisms
