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Fixed Ratio Beam Expanders

Fixed Ratio Beam Expanders

Wavelength range

266 – 2000 nm


From 1.1x to 10x

Lens material


Transmitted wavefront distortion, P-V

<λ/4 @ 632.8 nm

Overall transmission


Mounting thread



>10 J/cm2 @ 1064 nm, 10 ns, 10 Hz

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Fixed ratio beam expanders are optical systems for increasing a laser beam’s diameter. They are used in demanding laser applications such as the processing of laser materials.

Altechna offers beam expanders assembled from diverging and converging lens pairs in a way that means there is no focal point inside the beam expander. This allows the use of fixed ratio beam expanders with high power lasers.

For low expansion ratios (1.1 to 10 times), a Galilean beam expander is preferred for its simplicity and small size. Our standard beam expanders are designed to exhibit diffraction limited performance. Altechna’s beam expanders have adjustable divergence.  Lenses from fused silica are used, making the expanders suitable for high power and femtosecond applications. A beam expander for any wavelength between 266 and 2000 nm is available on request.

Typical Items for Fixed Ratio Beam Expanders
Wavelength, nm Expansion Input aperture, mm Exit aperture, mm Housing dimensions, mm Product ID
343-355 1.2X 10 12 Ø30 x 56.6 FBE-1.2x-0343-0355
1.5X 8.5 12.75 Ø30 x 55.7 FBE-1.5x-0343-0355
2X 5 10 Ø30 x 58.1 FBE-2x-0343-0355
2.5X 5 12.5 Ø30 x 79.4 FBE-2.5x-0343-0355
3X 5 15 Ø30 x 56.6 FBE-3x-0343-0355
4X 4 16 Ø30 x 80.1 FBE-4x-0343-0355
5X 3 15 Ø30 x 85.1 FBE-5x-0343-0355
515-532 1.2X 10 12 Ø30 x 58.2 FBE-1.2x-0515-0532
1.5X 9 13.5 Ø30 x 57.3 FBE-1.5x-0515-0532
2X 6 12 Ø30 x 59.6 FBE-2x-0515-0532
2.5X 6 15 Ø30 x 78.8 FBE-2.5x-0515-0532
3X 4.5 15 Ø30 x 58.2 FBE-3x-0515-0532
4X 4 16 Ø30 x 81.7 FBE-4x-0515-0532
5X 3 15 Ø30 x 87.6 FBE-5x-0515-0532
1020-1070 1.2X 10 12 Ø30 x 59.4 FBE-1.2x-1030-1064
1.5X 10 15 Ø30 x 58.4 FBE-1.5x-1030-1064
2X 6 12 Ø30 x 60.8 FBE-2x-1030-1064
2.5X 6 15 Ø30 x 80.6 FBE-2.5x-1030-1064
3X 5 15 Ø30 x 59.4 FBE-3x-1030-1064
4X 4.5 18 Ø30 x 82.9 FBE-4x-1030-1064
5X 3.5 17.5 Ø30 x 87.5 FBE-5x-1030-1064

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