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Variable Beam Expanders

Variable Beam Expanders

Wavelength range

266 – 1064 nm


1x-4x or 2x-8x

Pointing stability

<1 mrad

Lens material


Transmitted wavefront distortion, P-V

<λ/4 @ 632.8 nm

Overall transmission

>97% (>99% on request)

Mounting thread (input side)


Mounting thread (output side, on request)

M42 x 1.5 (outer), SM1 (inner)

LIDT for 2x-8x model

>5 J/cm2 @ 1064 nm, 10 ns, 100 Hz

LIDT for 1x-4x model

>6.5 J/cm2 @ 1064 nm, 10 ns, 100 Hz

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Variable beam expanders are ideal for systems where different magnifications and precise control of laser beam divergence are required.

Altechna offers variable beam expanders with high pointing stability and high LIDT AR coatings that minimize ghost reflections. Our variable beam expanders allow separate magnification and divergence adjustment. Once the desired beam size and divergence is reached, the position can be locked with two sets of screws. The design is compact and suitable for an industrial environment. Individual reports of beam ellipticity, M2 and pointing stability parameters can be provided on request. Depending on the customer’s system design, mounting adapters at the center, input and output are available on request.

Typical Items for Variable Beam Expanders
Wavelength, nm Expansion range Max input beam diameter*, mm Dimensions, mm Product ID
343-355 1x-4x 1X; 4.0 Ø41.5 x 120 VBE-1X-4X-0343-0355-B
2X; 5.5
3X; 3.0
4X; 3.0
2x-8x 2X; 5 Ø50 x 156.5 VBE-2X-8X-0343-0355-B-2M
3X; 5.0
4X; 4.0
5X; 3.0
6X; 2.5
7X; 2.25
8X; 2.0
515-532 1x-4x 1X; 4.5 Ø41.5 x 120 VBE-1X-4X-0515-0532-B
2X; 6.5
3X; 4.0
4X; 4.0
2x-8x 2X; 5.0 Ø50 x 156.5 VBE-2X-8X-0515-0532-B-2M
3X; 5.0
4X; 4.0
5X; 3.0
6X; 2.5
7X; 2.25
8X; 2.0
1030-1064 1x-4x 1X; 4.5 Ø41.5 x 120 VBE-1X-4X-1030-1064-B
2X; 7.0
3X; 5.0
4X; 4.0
2x-8x 2X; 5.0 Ø50 x 156.5 VBE-2X-8X-1030-1064-B-2M
3X; 5.0
4X; 5.0
5X; 4.0
6X; 3.0
7X; 2.5
8X; 2.5

* Max input beam diameter at 1/e2 intensity level ensuring diffraction limited performance.

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