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GCO140102 Beam Expanders
A beam expander is an optical system for changing the diameters of input and output beams. The product of the diameter and divergence for a laser beam remains constant between input and output. This means that, if the beam diameter increases from input, the divergence of the output will decrease. Beam expanders use this inverseproportional relationship between the diameter and divergence to expand a laser beam, or to reduce the beam divergence. Low divergence allows for a smaller focus spot of a Gaussian beam.
In summary, beam expanders are used for fine focusing, reducing beam divergence and minimizing diffraction effect. Daheng Beam Expanders (GCO14) are professionally designed for complicated systems and ideally used in combination with Daheng FTheta lenses (GCO31).
TECHNICAL NOTES
GCO14 Beam Expanders
Part No. 
Expansion Ratio 
Wavelength 
Max. Input Beam Diameter（1/e²） 
Input Aperture 
Outer Diameter 
Length 
Transmitted Wavefront 
Transmission 
Damage Threshold 
3X 
355nm 
6 
8 
40 
75 
<λ/4(RMS) 
>98.5% 
10J/cm2@10ns 10HZ 1064nm 

5X 
355nm 
4 
5.5 
40 
95 
<λ/4(RMS) 
>98.5% 

8X 
355nm 
3 
5 
40 
115 
<λ/4(RMS) 
>98.5% 

3X 
532nm 
8 
10.5 
40 
75 
<λ/4(RMS) 
>98.5% 

5X 
532nm 
6 
8 
48 
95 
<λ/4(RMS) 
>98.5% 

8X 
532nm 
4 
8 
48 
105 
<λ/4(RMS) 
>98.5% 

3X 
1064nm 
8 
10.5 
40 
75 
<λ/4(RMS) 
>98.5% 

5X 
1064nm 
6 
8 
48 
95 
<λ/4(RMS) 
>98.5% 

8X 
1064nm 
4 
5.5 
48 
105 
<λ/4(RMS) 
>98.5% 
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