ScienceGL
3D Laser Beam Profiler and Analyzer Software. Tutorial.
Fig.1. The Main Form, 3D and 3D windows, Animation control toolbar. |
Installation Installation / de-installation is automatic, just run *.msi file from CD or downloaded for performing desired action. Main Form Start the program from Start menu or desktop icon. The laser beam sample image will appear. The image file under processing is shown in StatusBar first panel (see Fig.1). The Main Form window is shown in Fig.1. The StatusBar indicates original image size as height and width in pixels, and 3D window pixel size. The 3D window size panel is clickable to provide you with possibility to change the 3D picture size. The 3D window is animated (rotated around Z axis) by default. You can stop the animation by pressing the "pause" button at the Animation Control Tool as shown in Fig.1. To run rotation again clock wise or anticlock wise, click "Run" triangle at the Animation Control Tool. The Main Window supports 2 basic modes: 3D maximized and 2D maximized. To toggle between the modes use "3D to 2D" button at left down portion of the main form. |
Fig.2. 2D View Mode, 1D beam profile plots, Gaussian fits. |
2D view
mode, laser beam intersection profiles You can switch between 3D mode and 2D mode by "3D to 2D" button as shown in Fig.2. This will maximize 2D sub-window. Enable beam parameters calculations mode as shown in Fig.2, upper arrow. Use parameter buttons to calculate specific parameter. The buttons are enabled in calculation mode (see Fig.2, left side button group). Press "Centroid" button in this group (see Fig.3). This will calculate centroid position as shown in main form at left side (see xC and yC, values are given in pixel units). |
Fig.3. True ellipse and Gaussian fits. Beam parameters and statistics. |
Beam
analyzing and parameters calculation "StatTable" button will perform main statistics calculation and bring you the result form. The ellipse will be calculated and drawn around the beam. The ellipse is found as true least square fit in 2D for the beam at 13% intensity level. The resulting ellipse is shown as white ellipse line (Fig.3, blue arrow). The Gaussian fits are calculated for both vertical and horizontal intersection (Fig.3 red line marked by the cyan arrow). The fit profile is drawn together with measured profile (Fig.3, red and white lines respectively). The Gaussian fit is calculated as least square to all points in profile. We note here that we apply quite sophisticated ellipse and Gaussian fits implemented as true Least square incremental search algorithm as compared to most of the software packages that utilize simplified less accurate algorithms.
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Fig.4. Diameter calculation. Beam parameters with Gaussian fitting and ISO. |
Beam parameter and statistics table The results of the statistical beam parameter calculation is shown in Fig.4. The laser beam diameter measurement is shown in both pixel and micron units. The most reliable diameter measurement for single mode beams is given by Gaussian width. For complicated beams you can use ISO slit and knife diameters as defined by ISO. All diameters are calculated separately in X and Y directions. |
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3D visualization options |
Fig.6. 3D visualization of laser beam. Intersection Planes are shown. Light is set to be inclined for better observation of the noise. |
3D
visualization, more options Menu>Options>Reflections option toggle surface specular or reflective. Specular surface representation helps you to see fine structure of the surface. You can use Zoom Tools to zoom surface in and out. Zoom can be used either from menu or by magnifier buttons of the main toolbar. Go Menu>View>2D cut View to initiate 2D cut form. |
Fig.7. 2D plot of the 1D intersections between laser beam surface and cut planes. Laser beam profiling is achieved by moving orthogonal X and Y planes in 3D window or by setting the plane position within 2D view form. |
Detailed intersection plot form.
Cut View. |
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