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  • Beam Expanders

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Product description:

Beam expander is an optical component built to enlarge the diameter of collimated input beam and reduce the beam divergence. It’s primarily applied in applications of Laser scanning, laser cutting, interferometry and remote sensing. A typical Galilean type beam expander consists of one negative lens and one positive lens.

CASTECH provides the beam expanders of both adjustable divergence and non-adjustable divergence types. Our portfolio covers diverse variation of magnification and output diameter so that ideal for a wide range of demands of our customers. All the optics inside are well-polished and AR coated to exhibit high beam quality with low loss.

 

Applications:

● Laser scanning

● Short pulse laser

● Ultra-short pulse laser

 

Iintroduction:

  Fixed magnification Variable magnification
Material Fused Silica Fused Silica
Wavelength 355nm,532nm or other 355nm,532nm or other
Magnification 2,3,4,... 5,6,7,8,10,... 2,5,7.5,... 1-3X,1-4X,2-8X or other
Clear  Input Aperture 12,  8mm 8mm 8mm 10mm or other
Clear  Output Aperture 26, 20mm 31mm 15mm 20mm or other
Max.  Input Beam Diameter(mm) 10,  6, 4mm 6,  4, 3mm 2mm 6mm-9mm or other
Outside  Diameter(mm) 42mm 46mm   44mm
Total  Length(mm) 58mm 80mm / 96.5mm
Screw  Thread M22×0.75  or   M30×1 /
Transmission >98%
Divergence  Adjustable No or  Yes Yes
Damage  Threshold 5J/cm², at 355 nm, 5  ns, 10 Hz

 

BE- a – b – c – d - h
Wavelength(a) Magnification(b) Thread(c) Divergence Adjustable (d) Housing (h)
355nm 2(2X) 2(2M22*0.75) A G01
... 3(3X) 3(3M30*1) (yes) G02
  ... ... B ...
      (no)  
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