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Modular Fixed-Power Beam Expanders
Nov 2005
Edmund Optics Inc.Request Info
Focus Mechanism with Non-Rotating Optics
BARRINGTON, N.J., Nov. 17 -- Edmund Optic's family of beam expanders offer high performance optical designs packaged in a precise optomechanical platform. Two full rotations of the focus knurl provide smooth movement for the optics in order to vary the output from collimated to the minimum focus distance of 1.2 m. The focusing mechanism keeps optics from rotating, which helps maintain bore sight accuracy and a minimally aberrated focused beam, while the focus lock secures its position. The beam expanders are easily secured to both metric and English threaded mounts. Four tapped holes (two M6 on 25-mm centers and two 1/4-20 on 1-in. centers) are located near the middle of the assembly for mounting.

According to the company, rear accessory attachments are a cost-effective way to change beam expander magnification, but cannot be used in series to increase magnification. To change the expander magnification, disassemble the back portion of the beam expander by unscrewing three socket head cap screws and replace it with the desired magnification attachment. For instance, the 20X beam expander can be changed to a 5X beam expander by utilizing the 5X rear attachment in place of the 20X attachment that was originally included.

Other features included in the design are: focus locking set screw, C-mount interface (1"-32TPI) for mounting onto our HeNe lasers and 1/4 wave MgF2 (@ 632.8 nm) antireflection-coated optics.

For more information, visit:; e-mail:

Edmund Optics
101 E. Gloucester Pike
Barrington, NJ 08007
Phone: (856) 573-6250
Toll Free: (800) 363-1992
Fax: (856) 573-6295
Web site:


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