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Laser Beam Expanders

DiOptika manufacturers a wide range of Laser Beam Expanders, Red Laser Beam Expanders , Green Laser Expanders , NIR Laser Expanders , YAG Laser Beam Expanders, MID & Far IR Laser Expander , Zinc Selenide Laser Expander , UV Laser Expander and customer laser beam expanders. We also offer a custom beam expanders and beam expander design as well as OEM Beam Expander Optics.

For DiOptika's range of laser safety products go to DiOptika Safety USA and DiOptika Safety Australia

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Laser Beam Expanders - Theory

Laser beam expanders are designed to either decrease the laser's beam spot size at large distances or produce a larger diameter         
collimated laser beam. The main types of beam expanders: Keplerian and Galilean. In its simplest form, the Galilean type consists of a
positive and a negative focal length lens whereas the Keplerian type consists of two positive focal length lenses. Both designs provide a certain angular magnification, called the Expander Power. The beam diameter is first increased in size by this power and then the  beam divergence is reduced by the same power. This combination yields a beam that is not only larger, but one that is also highly collimated. The result is a smaller beam at a large distance when compared to the laser alone.  See the below equation:

   

BL = ß + ØL (0.3048)
BL = Beam Diameter (mm) at distance L
ß = Increase in Beam Diameter
  = Beam Diameter (mm) x Expander Power
Ø = Decrease in Beam Divergence
  = Beam Divergence (mrad) Expander Power
L = distance (ft.)

         

This equation is an approximation for the collimated output beam size at a given distance.

            In addition, an expanded beam can yield smaller spot sizes when used in combination with additional focusing optics. This is very useful in focusing optimization. however, many applications simply require a larger continuous beam. The beam expander power (MP) is equal to the ratio of the effective focal length (EFL) of the objective lens to the effective focal length of the entrance optic. The physical separation between the objective lens and entrance optic is equal to the sum of their back focal lengths (BFL).

            DiOptika’s  beam expanders are of the Galilean type. The advantages of the Galilean design over the Keplerian is that it contains no internal focal point therefore reducing the length.  In addition to improving beam collimation, DiOptika’s beam expanders can also be used to focus laser beams.

 

 

 

laser beam expander , beam-expander

YAG Laser Beam Expanders, Red Laser Beam-Expanders , Green Laser Beam Expanders , NIR Laser Beam-Expanders , MID & Far IR Laser Beam Expanders , Zinc Selenide Laser Beam-Expanders , UV Laser Beam Expanders and customer laser beam expanders. 248nm - 355nm Laser Beam-Expander , 532nm - 1064nm Laser Beam Expanders , 1300nm , 1550nm , 1700nm Laser Beam-Expander , 3-5um & 10,600nm Laser Beam Expanders , Galilean Beam Expanders. We also offer a custom design of optical systems for use with laser systems. Dioptika Safety provides an extensive range of DiOptika laser safety eyewear covering almost all laser types that can ship anywhere in the world. Laser Safety Eyewear includes: telecom laser safety glasses , Nd:YAG laser safety glasses , Alexandrite laser safety glasses , Nd:YAG Harmonics laser safety glasses , IPL safety glasses , HeNe laser safety glasses , CO2 laser safety eyewear , Argon laser safety goggles , stainless steel patient blockout eyewear , Erbium laser eyewear , Dye laser spectacles , Ruby laser goggles , red and green laser protective eyewear. Other types are availble on request. On this site you will also find general laser safety information resources about the laser safety regulations for most counties around the world.

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