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| Coad | 664071 | Type | Shearing Interferometer | |
| Dimension(mm) | 50.8 x 48.3 x 55.9 | Beam Diameter（mm） | 10.0 - 25.4 | |
| Approximate Optical Path Difference（mm） | 16.20 | Wedge Prism Diameter（mm） | 38.00 | |
| Diameter Tolerance | +0.00/-0.25mm | Wedge Prism Thickness | 6.35mm | |
| Thickness Tolerance | ±0.25mm | Wedge Prism Material | UVFS | |
| Scattering Plate Material | N-BK7 | Scattering Plate Grit | 220 | |
| Wedge Prism Wedge Angle | 18arcsec | Compatible Shear Plate | TSIP254 | |
| Compatible Shear Interferometer | - | |||
LBTEK Shear Interferometer consists of a wedge prism placed at a 45° angle and an observation plate, where the wedge prism is made of UV Fused Silica and the observation plate is a scattering plate with a reference line engraved in the middle. The wedge angle of each prism is optimized for the beam size it can measure, and the specific angle can be found in the product specifications. The scattering plate is used to observe the interference fringes generated by the Fresnel reflections from both surfaces of the wedge prism. The intensity of the fringes is maximized when the polarization direction of the incident beam is perpendicular to the plane formed by the incident light and the normal of the shear plate.
It is important to note that interference fringes can only be observed when the coherence length of the laser beam is greater than the optical path difference caused by the wedge prism. The approximate optical path difference (ΔOPL) generated by the wedge prism can be found in the product specifications for each model. LBTEK Shear Interferometer can be used for qualitative analysis of beam collimation. If you have any other questions, please contact us.
LBTEK Shear Interferometer consists of a circular wedge prism placed at 45° and an observation plate, and can qualitatively analyze the collimation of the beam. Depending on the shear plate, it is available in four models for beam diameters of 1 mm - 3 mm, 2.5 mm - 5 mm, 5 mm - 10 mm, and 10 mm - 25.4 mm. For other requirements, please contact us.
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