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Line Laser
Definition of Line Laser
A laser that converts a point laser beam into a high-uniformity linear beam output through optical shaping. Its core lies in generating a clear, stable and uniform linear light spot, which is widely used in industrial inspection, precision positioning, machine vision and other fields.
Methods and Principles of Beam Conversion
1. Cylindrical Lens: A cylindrical lens has one flat surface and one cylindrical surface. It only performs simple shaping on a point light source in one dimension, converting a collimated laser beam into a line beam. When a Gaussian light spot is incident, the energy distribution of the resulting linear light spot is strong at the center and weak at both sides, with relatively poor uniformity.
Cylindrical Lens Laser Line
2. Cylindrical Lens Array: A cylindrical lens array consists of cylindrical lenses with equal spacing. Compared with traditional cylindrical lenses, it can not only generate a linear light spot but also homogenize the light source energy along the expansion direction. When used with a lens, it can obtain a homogenized linear light spot with sharp edges through the method of first differentiation and then integration. It is used to obtain high-precision linear light spots, with uniformity > 90% within the 80% centrally symmetric range of the laser line, and is a commonly used method in CNI line lasers.
3. Powell Lens: A Powell lens fans out a collimated beam into a one-dimensional laser line. It features an aspherical curved surface at the top, and through precise control of the lens surface curvature, it significantly increases spherical aberration, reduces the light intensity in the central area, and enhances the light intensity at both ends of the linear light spot. Thus, the collimated incident Gaussian light achieves uniform intensity distribution after passing through the Powell lens. It can generate a linear light spot with relatively uniform energy, eliminating the central hot spot and fading edge distribution of Gaussian beams. With uniformity > 70% within the 80% centrally symmetric range of the laser line, it is a commonly used method in CNI line lasers.
Powell Lens Laser Line
4. Line Grating Plate
The line grating plate is low in cost but poor in line uniformity, with breakpoints. Low-priced products on the market generally adopt this type of line laser generator.
Line Grating Plate Laser Line
Main Parameters of Line Lasers
1. Fan Angle
The choice of the fan angle is related to the working distance and line length of the laser line. Common standard angles include 10°, 15°, 30°, 45°, 60°, 75°, 90°, etc., and special angles can be customized.
2. Line Uniformity
The line uniformity of a line laser generally refers to the ratio of the intensity distribution to the average intensity value within a given area. Based on years of customer cooperation experience, CNI has strictly defined this indicator and expressed the beam power uniformity (Pavg) according to the following formula. Adopting rigorous testing methods, a high-precision power meter is used with a slit to scan the entire projected line and integrate the power at each point. The values obtained through analysis are used to define (Pmax) and (Pmin), thereby ensuring the accuracy of (Pavg).
This stricter definition enables the quantification of the indicator. By selecting products with appropriate power uniformity, different application requirements can be met. Meanwhile, complying with this specification helps maintain high product consistency, allowing system integrators to more easily calibrate their products and sustain consistent performance.
3. Straightness Deviation (Error)
It refers to the ratio of the maximum deviation Dx of the intensity center position within the line length range of the laser line to the line length L. Straightness = Dx/L × 100%. The straightness of CNI's line lasers can meet ≤ 0.1% at its best.
4. Line Width
It adopts an internationally accepted method, calculated according to 1/e². The minimum line width of CNI's line lasers can reach 5µm.
5. Depth of Field
The laser has the minimum line width at the focal position (commonly used working distance position), denoted as ω₀. The distance ±ZR between the two points where the spot size increases to √2ω₀ before and after ω₀ is the depth of field corresponding to the line width.
Typical line laser
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Line Laser Module | Low-Noise Line Laser for Research |
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High-Power Line Laser / Structured Light | High-Power Illumination, Line-Width Fill Light |
Typical Applications
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Changchun New Industries Optoelectronics Technology Co., Ltd.
Address: No. 888 Jinhu Road, High-Tech Zone, Changchun, 130103, P.R.China
International Tel:+86-431-85603799
Email: sales@cnilaser.com
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