Laser Beam Reform with Aspherical Lens
Introduction
This video provides an overview of a beam reshaper, specifically a Gaussian beam homogenizer. The following sections detail the setup and optimization process for achieving homogeneous illumination using this device.
Setup Details
- Input Gaussian Beam:
- Polarization: Set to 6
- Beam Waist: 5 mm
- Homogenizer Lens:
- Type: Single piece lens
- Surfaces: Two surfaces
- First Surface: Spherical with an initial radius of 8 mm
- Thickness: 0.5 inches
- Diameter: 1 inch
- Positioning:
- Distance from Image Plane: 80 mm
- Image Plane Size: 30
- Illumination Area: 20 radii
Design and Optimization
The design process utilizes the operand of REAY in the Mary functions, which corresponds to the PY, representing the normalized coordinates at the object plane and target plane as unnormalized coordinates.
Calculation Process
- PY is divided into 40 steps, representing the normalized coordinates.
- Calculate the unnormalized coordinate at the object plane using the equation involving the beam waist (W) and polarization factor.
- Display calculations in the corresponding column.
- Calculate the unnormalized coordinates in the image plane using a specific equation, with results shown in another column.
Optimization Steps
- Copy the two columns, PY and the calculated values.
- Paste them into the Mary function editor, with PY in one section and the target in another.
- Run the optimization process.
Results
Before optimization, the profile at the image plane is relatively uniform. Post-optimization, within the targeted area of -20 to +20, the illumination becomes significantly more homogeneous.
For more information, please refer to Ozen Engineering, Inc.
Title: Laser Beam Reform with Aspherical Lens Here, I provide a beam reshaper, also known as a Gaussian beam homogenizer. The polarization of the input Gaussian beam is set to 6, and the waist of the Gaussian beam, as seen in the profile here, is set to 5 mm.
The homogenizer is a single piece of lens containing two surfaces. The first surface is a spherical surface with an initial radius of 8 mm, a thickness of 0.5 in, and a diameter of 1 in. The terms of the homogenizer are initially set to zero.
The homogenizer is placed 80 millimeters away from the image plane. The image plane size is set to 30, and the illumination area is set to 20 radii.
The design is achieved through the operand of REAY in the MARY functions, corresponding to the PY normalized coordinates at the object plane and the unnormalized coordinates at the target plane. To proceed, we separate PY into 40 steps, the normalized coordinates.
Using this, we calculate the unnormalized coordinate at the object plane with the given equation. The calculations are shown in this column. Similarly, we calculate the unnormalized coordinates in the image plane using another equation, and the calculations are shown in this column.
We then copy these two columns, PY and the unnormalized coordinates in the image plane, and paste them into the MARY function editor. After running the optimization, we can see a uniform illumination in the targeted area from negative 20 to positive 20.
