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Fixed Ratio Beam Expanders

Fixed Ratio Beam Expanders

Wavelength range

266 – 2000 nm

Expansion

From 1.2x to 12x

Lens material

UVFS

Transmitted wavefront distortion, P-V

<λ/4 @ 632.8 nm

Overall transmission

98%

Mounting thread

SM1

LIDT

>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 (1.2 to 20 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.

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