We manufacture a variety of laser beam expanders to suit most laser types, from small waveguide lasers up to multi-kilowatt industrial lasers. There is also a modular range for experimental and laboratory purposes.

The most common type of beam expander is derived from the Galilean telescope which usually has one negative input lens and one positive output lens. The input lens presents a virtual beam focus at the output. For low expansion ratios (1.3-20 times) the Galilean telescope is most often employed due to its simplicity, small package size and low cost.

Material: BK7 fine annealed
Diameter: -0.1mm
Thickness: ±0.1mm
Flatness: l/4
Surface Quality: 60-40 scratch-dig
Coating: HR dielectric coatings R > 99%

Part number description: BEST-xxx-yy-z-M-T-AA

BEST ---  BEST series beam expanders

xxxx------- laser wavelength: 10.6 means 10.6um, 532 means 532nm, 633 means 633nm.

yy  -------- expansion ratio in times

Z   -------- lens material: Z means ZnSe; G means GaAs, none means optical glass.

L ---------- beam expander shaper, L means trumpet-shape, none means cylinder shape.

M --------- connection: M means screw connection; none means cylinder connection.

T ---------- type: T means adjustable beam expander; none means fixed beam expander.

AA -------- special purpose.

Example: BEST-10.6-3GM: 10.6um fixed beam expander, 3x, GaAs material, cylinder, screw connection.

                BEST-10.6-3.5Z: 10.6um fixed beam expander, 3.5x, ZnSe material, cylinder.

There are 2 types of beam expander: fixed and adjustable beam expanders.

Cylinder-shape fixed beam expander