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Analysis of Laser Beam Expander Technology
Posted on:
2022-05-13
The Laser Beam Expander is designed to expand a parallel input beam to a larger diameter parallel output beam. Laser Beam Expanders are used in applications such as laser scanning, interferometry or telemetry. Today's Laser Beam Expanders are all afocal system designs developed from a well-established optical telescope foundation. In such systems, light rays from an object at infinity enter the optical axis of the inner optics in a parallel manner and also exit in a parallel manner. This means that the entire system has no focal length.
Traditionally, optical telescopes were mainly used to observe distant objects, such as celestial objects in the universe. Optical telescopes can be mainly divided into two categories: refracting telescopes and reflecting telescopes. Refractor telescopes use lenses to refract or bend light, while reflecting telescopes use mirrors to reflect light.
The most versatile Beam Expanders originate from Galilean telescopes and typically include an input negative lens and an output positive lens. The input mirror transmits a virtual focus beam to the output mirror, and the two lenses are virtual confocal structures. Generally, beam expanders smaller than 20 times are manufactured by this principle, because it is simple, small in size and low in price. As far as possible the beam expander is designed to have small spherical aberration, low wavefront distortion and achromatic. Its limitation is that it cannot accommodate spatial filtering or beam expansion with large magnifications. The beam expander and collimation magnification are not only related to the parameters of the beam expander, but also to the parameters of the laser beam and the position of the beam expander lens. The function of the Beam Expander is to reduce the divergence angle of the laser beam, thereby making the laser focus smaller. A Kepler-style telescope consists of lenses of positive focal length, which are divided by the sum of their focal lengths. The lens that is close to the source image or the object being observed is called the objective lens, while the lens that is close to the eye or the image is called the imaging lens.
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