SuperGaussian

The focal length of a lens is a fixed characteristic and cannot be changed. However, the field of view and magnification can be altered by using different lenses or adjusting the distance between the lens and the image sensor.

ZIP-Document (ZIP, 159 KiB)

Liu, Che, and Yanling Guo. 2022. "Flat-Top Line-Shaped Beam Shaping and System Design" Sensors 22, no. 11: 4199. https://doi.org/10.3390/s22114199

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Focal length can be calculated by dividing the distance from the lens to the image sensor (or film) by the distance from the lens to the subject. This is known as the thin lens equation: 1/f = 1/di + 1/do, where f is the focal length, di is the distance from the lens to the image sensor, and do is the distance from the lens to the subject.

Beamshaping

The size of the image sensor can affect the effective focal length of a lens. A larger sensor will capture a wider field of view and result in a shorter effective focal length, while a smaller sensor will capture a narrower field of view and result in a longer effective focal length.

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Liu, Che, and Yanling Guo. 2022. "Flat-Top Line-Shaped Beam Shaping and System Design" Sensors 22, no. 11: 4199. https://doi.org/10.3390/s22114199

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The focal length of a lens is directly related to its magnification power. A shorter focal length results in a wider field of view and less magnification, while a longer focal length results in a narrower field of view and greater magnification.

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Liu, C.; Guo, Y. Flat-Top Line-Shaped Beam Shaping and System Design. Sensors 2022, 22, 4199. https://doi.org/10.3390/s22114199

Abstract: In this study, the circular Gaussian spot emitted by a laser light source is shaped into a rectangular flat-top beam to improve the scanning efficiency of a selective laser sintering scanning system. A CO2 laser with a power of 200 W, wavelength of 10.6 μm, and spot diameter of 9 mm is shaped into a flat-top spot with a length and width of 0.5 × 0.1 mm, and the mapping function and flat-top Lorentzian function are calculated. We utilize ZEMAX to optimize the aspherical cylindrical lens of the shaping system and the cylindrical lens of the focusing system. We then calculate the energy uniformity of the flat-top line-shaped beam at distances from 500 to 535 mm and study the zoom displacement of the focusing lens system. The results indicated that the energy uniformity of the flat-top beam was greater than 80% at the distances considered, and the focusing system must precisely control the displacement of the cylindrical lens in the Y-direction to achieve precise zooming. Keywords: selective laser sintering; flat-top line beam; dynamic focus

Laser beam

Liu C, Guo Y. Flat-Top Line-Shaped Beam Shaping and System Design. Sensors. 2022; 22(11):4199. https://doi.org/10.3390/s22114199

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Liu C, Guo Y. Flat-Top Line-Shaped Beam Shaping and System Design. Sensors. 2022; 22(11):4199. https://doi.org/10.3390/s22114199

Liu, C.; Guo, Y. Flat-Top Line-Shaped Beam Shaping and System Design. Sensors 2022, 22, 4199. https://doi.org/10.3390/s22114199

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Focal length is a measurement of the distance between the center of a lens and the point where light rays converge to form a clear image. It is typically measured in millimeters (mm) and is an important factor in determining the magnification and field of view of a lens.

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