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Beam Displacement Optics![]()
XYT-C Post-Mountable Beam Displacement Module HWXYT-A FiberBench Beam Displacement Module ![]() Please Wait ![]() Click to Enlarge Calculated Beam Displacement of UVFS and CaF2 Tweaker Plates as a Function of Angle of Incidence Features
Thorlabs' Tweaker Plates are designed to allow adjustable beam displacement within an optical system. We offer a post-mountable, free-space tweaker plate, as well as a FiberBench-compatible tweaker plate. Both versions have an AR-coated, plane-parallel plate mounted on them. These plates feature Thorlabs' standard A (350 - 700 nm), B (650 - 1050 nm), C (1050 - 1620 nm), D (1650 - 3000 nm), or E (2000 - 5000 nm) AR coating. The A, B, and C coatings have <0.5% average reflectance over their specified wavelength ranges, while the D coating has <1.0% average reflectance and the E coating has <1.25% average reflectance over their respective wavelength ranges. The A, B, and C coated plates are made from UV fused silica (UVFS), while the D and E coated plates are made from calcium fluoride (CaF2). The reflectance curves for all five coatings are located on the Graphs tab. ![]() Click to Enlarge Lateral Beam Displacement Equation ![]() Click to Enlarge Click Here for Raw Data The blue shaded region indicates the specified 650 - 1050 nm wavelength range for optimum performance. Performance outside of the specified range is not guaranteed and varies from lot to lot. ![]() Click to Enlarge Click Here for Raw Data The blue shaded region indicates the specified 350 - 700 nm wavelength range for optimum performance. Performance outside of the specified range is not guaranteed and varies from lot to lot. ![]() Click to Enlarge Click Here for Raw Data The blue shaded region indicates the specified 1.65 - 3.0 µm wavelength range for optimum performance. Performance outside of the specified range is not guaranteed and varies from lot to lot. ![]() Click to Enlarge Click Here for Raw Data The blue shaded region indicates the specified 1050 - 1620 nm wavelength range for optimum performance. Performance outside of the specified range is not guaranteed and varies from lot to lot. ![]() Click to Enlarge Click Here for Raw Data The blue shaded region indicates the specified 2.0 - 5.0 µm wavelength range for optimum performance. Performance outside of the specified range is not guaranteed and varies from lot to lot.
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This post-mountable tweaker plate module consists of a precision-polished, AR-coated, plane-parallel plate mounted on Thorlabs' TRB1 ball and socket adapter. It allows for quick and precise beam displacement and provides a 50° adjustment cone along with three 90° positions. The module can be adjusted in increments of 10 µm by hand, depending on the dexterity of the user, and can be mounted onto a Ø1/2" post via an 8-32 (M4) tapped hole in the base. It also has three radially positioned locking screws to lock the ball and socket in place, which also work as tension adjusters for precision alignment. Upon locking, the beam may shift by ±2 µm. This module is ideal for both horizontal and vertical free-space beam steering and for correcting known offsets of optical systems. The module is shipped with a hex key. The AR-coated plane-parallel plate has <0.5% average reflectance over its specified wavelength range. The plates have Thorlabs' standard A (350 - 700 nm), B (650 - 1050 nm), or C (1050 - 1620 nm) AR coating. The reflection curves for all five coatings are located in the Graphs tab above. The performance of the AR coatings on these optics deteriorates at angles of incidence beyond 30°. For general information about optical coating performance, please see our optical coatings guide. ![]() ![]()
The XY Tweaker Module, for use in Thorlabs' FiberBench systems, consists of a precision-polished, AR-coated, plane-parallel plate mounted on a magnetic ball and socket for 360° rotation. The module allows for quick and precise displacement of a beam parallel to the optical axis, thus enabling several hundred microns of positional correction in increments of roughly 10 µm, depending on the dexterity of the user. The 2.5 mm thick plates can be rotated and tilted in nearly any orientation. The beam is consequently displaced parallel to the optical axis by as much as 500 µm, as shown in the graph on the Overview tab above. However, the performance of the AR coating on these optics deteriorates at angles of incidence beyond 30°. For general information about optical coating performance, please see our optical coatings guide.
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