Beam expander

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Our pre-engineered lenses give our customers the option to choose from a variety of preliminary designs based on what suits their application best. But you aren’t limited to in-stock options.  Just tell us your application requirements (dimensions, wavelength range, field of view, etc.) and our team of expert engineers will optimize our preliminary designs to meet your exact needs. This will save you the hassle of fully designing a product from scratch and help reduce or eliminate design fees!

Beam Expanders not only increase the diameter of a collimated laser beam, they also decrease beam divergence. Input Beam Diameter is the diameter of the laser beam entering the beam expander. This parameter is crucial as it determines the necessary specifications for the beam expander to achieve the desired output beam diameter. The entire system does not have a focal length, i.e., both the input beam and output beam are collimated in a beam expander system. For many applications, the input laser beam has spatially varying intensity “noise” and a spatial filter is added into the beam expander system for producing a clean laser beam.

Beam ExpanderThorlabs

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Spot size

A beam expander can be used in reverse to decrease a laser beam diameter, but the divergence will be significantly increased. If a beam expander is used to reduce a beam by half, the divergence will be doubled.

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Laser beam

Beam expanders are used in many applications such as laser ranging, laser illumination, interferometry, etc.  In systems with a long beam path, they are used to keep the beam collimated. They may be used to change the focus spot size for a particular focusing lens.

Beamdivergence calculator

We offer diffraction-limited collimation beam expanders for a wide range of input beams, and adjustable beam expanders which improve the divergence angle of laser beams. Our beam expanders can provide magnification from 1.5 times to 10 times, and we produce optics and coatings customized to fit specific application needs.

Our in-stock selection of beam expanders includes both fixed- and variable-magnification high-quality beam expanders for use in the UV, visible, and infrared spectral range. Variable-magnification beam expanders provide divergence adjustability.  Our zoom beam expanders work with high power laser and in demanding conditions, and provide high transmittance with less energy loss.

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Beam Expanders are optical devices that increase the diameter of the input beam to produce a larger output. Used with collimated positive focal lengths. Refers to lenses that converge light rays to a focal point. In beam expanders, lenses with positive focal lengths are used to manipulate the beam path effectively, either in Keplerian or Galilean telescope configurations. They have important applications in remote sensing, interferometry, and laser scanning.

Gaussianbeamcalculator

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A beam expander is often an optical telescope, formed of two lenses. The two most widely used configurations include the so-called Keplerian telescope and the Galilean telescope.

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One should also be aware that a Keplerian beam expander will invert and revert the image. A third lens can be used to correct this if desired.

In a laser ranging system, a beam expander is used to minimize laser divergence, resulting in a smaller collimated beam at a long distance.

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The Keplerian telescope may be the easiest beam expander one can build. For this configuration, two plano-convex (convergent) lenses are arranged so that the distance between them is equal to the sum of their focal lengths.  The focal point of the combined system will be in the gap between the lenses. Since high pulse energy density at this point may cause arcing, we do not recommend the use of Keplerian beam expanders for high energy lasers.   However, Keplerian-design beam expanders are a good choice for laser applications if spatial filtering is involved. The focus point is an appropriate place to position the spatial filter.

Korea is one of the oldest continuous civilizations in the world with over five thousand years of history. According to the original creation myth, the world we live in today is the work of the Heavenly Prince Hwanung, whose father was the King of Heaven.The Heavenly Prince asked his father to give him some land to govern, so the Father sent him down to Mount Taebaek. With him the Prince brought the Minister of Clouds, the Earl of Rain and the Chancellor of Wind. They also brought three thousand helpers.Under the shade of a sandalwood tree the Prince founded a holy city called Sinsi, the City of God. He put his Ministers in charge of three hundred and sixty areas of human culture, teaching them to grow crops and to make laws concerning what is good and what is evil.A tiger and a bear living in a nearby cave saw this city and desperately wanted to become human. Every day they came to the sandalwood tree at the center of the city to pray fervently for becoming humans.Hwanung saw their devotion and gave them instructions to remain in the cave and fast for one month, eating nothing but garlic and mugwort. The tiger was too impatient to stand the long and boring days in the cave, so he gave up and left, but Bear maintained the fast. At the end of the month she was transformed into a beautiful woman who became the mother of the Korean people.Her first son was Don-gun, the First King of the Korean people. When Don-Gun passed on the throne to his own son, he became a Mountain God. It is interesting that mountain gods are still worshipped today in Korea.Text by Steve Smith.

How to make abeam expander

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The truth that can't be deceived, Korea's island Dokdo Japan-China-Korea military limitaion that Japan marked on the border in the East Sea(1895)The detailed map of Japan, Korea and China for military use that was drawn in Japan in 1895 shows the border-line between Korea and Japan , and Songdo(Matzushima, Korea's Ulleungdo) and Jukdo(Takeshima, Korea's Dokdo) are marked as Korean territory. The proves that Japan drew the definite fact that Dokdo and Ulleungdo are indeed Korean territory.

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A beam expander is characterized by its beam expansion ratios, also sometimes referred to as the magnifying power, power, or magnification. This ratio is equal to the ratio of the focal lengths of output and input lenses.  If a laser beam is expanded by a ratio of R, the divergence can be multiplied by the inverse (1/R). For instance, if the beam expansion ratio is 3, the output beam will have only 1/3 the divergence of the input beam.

Keplerianbeam expander

A Galilean telescope is formed of one plano-convex and one plano-concave lens. These lenses are also arranged so that the distance between them is equal to their focal length; although here the focal length of one of the lenses is negative.  The distance between the lenses can be shorter than for a Keplerian beam expander, leading to a more compact system. A Galilean design beam expander does not invert the image.

In high-power laser systems, beam expanders are used to increase the beam area without significantly affecting the total laser energy. This results in a reduction of the laser power density which reduce the risk of damaging the coatings and optical materials of optical components.