Abstract
A laser line generator projects a straight line on an object and is widely used for alignment, identification, barcode reading, etc. Conventional laser line generators make use of cylindrical and Powell lenses that convert a laser beam spot into a line. Because of a fixed fan angle, however, the length and brightness of the generated line depends on the working distance between the laser module and object. In this project, using the optical system design software Zemax and engineering CAD software Solidworks, a micromirror based laser line generator is designed and fabricated. The performance of the fabricated micromirror based laser line generator is tested and compared with the performance of a conventional laser line generator. The results show that the length and brightness of image line can be kept constant by the designed generator.
Highlights
A laser beam is projected on the mirror and the length of the scanning line is measured
siliconon- insulator (SOI) micromirrors which can be resonantly driven by different actuation methods offer several advantages like high scan frequency, very small size and potential for low manufacturing cost
For a collimated laser beam and a flat micromirror, there is no need of lens
Summary
The term “laser” is an acronym for “Light Amplification by Stimulated Emission of Radiation”. Lasers generate light beams that are monochromic, coherent and highly collimated. Lasers can be generally placed in four categories: gas lasers, semiconductor lasers, optical lasers and other types. Each category itself consists of many types with different wave lengths and applications. A laser diode which is a kind of semiconductor laser, has applications in fiber optic communication, laser scanning, and laser printing. Conventional laser line generators usually make use of two types of lenses: cylindrical lens and Powell lens. One kind of cylindrical lens, namely plano-convex type, can produce a thin line on the image plane. The linear spot generated by a cylindrical lens, has a Gaussian intensity distribution [1]. Powell lens, which has the shape of a circular prism with a curved roof line, can increase the uniformity of the linear spot [2].
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