These Galilean Beam Expanders provide an ideal solution for expanding or reducing beam diameters. Beam expanders are commonly used to reduce divergence. Another common use is to expand the beam and then focus with another lens to take advantage of a reduction in spot size. These beam expanders have all been designed to minimize the telescope length, minimize the introduced wavefront error (<λ/4), and provide diffraction-limited performance (for <Ø1 mm input).
The design incorporates a plano-concave singlet to provide the desired divergence and a doublet, which has been computer optimized to balance aberrations and re-collimate the beam. The rotary barrel controls adjustment of the diverging lens with graduations in 50 µm increments. All of the designs are available with an A (350-650 nm), B (650-1050 nm), or C (1050-1620 nm) broadband anti-reflection coating.
Thorlabs also offers a variable beam expander, which provides a continuous expansion ratio ranging from 2-5X.
The new BE series of beam expanders now come with an improved design for easier mounting and alignment (see photos below). The input aperture has been threaded to provide compatibility with our externally threaded SM05 (for BE02 to BE05 models) or SM1 (for BE10 to BE20 models) products. As a result, these beam expanders are able to be used with any of our standard adapters, lens holders, iris diaphragms, etc.
The image to the right shows the beam expander mounted in a KS1 lens mount. All BE series beam expanders have been notched to mount in a KS1 kinematic mount (for BE02 to BE05 models) or KS2 kinematic mount (for BE10 to BE20 models).
The image to the left shows the new mounting configuration available with all BE series beam expanders. A 4-40 (for BE02 to BE05 models) or an 8-32 (for BE10 to BE20 models) tapped hole allows for an alternate mounting style.
2X Beam Expanders
| Item# | Expansion | Input Aperture |
Max. Input 1/e2 Beam Diameter |
AR Coating |
| BE02M-A | 2X | 8 mm | 4.0 mm | 350-650 nm |
| BE02M-B | 2X | 8 mm | 4.0 mm | 650-1050 nm |
| BE02M-C | 2X | 8 mm | 4.0 mm | 1050-1620 nm |
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