Radial-Polarization Spot Comparison
Compare radial- and linear-polarization focal spot diameters and areas.
Description
Focal-spot area comparison squares the diameter ratio for circular spots.
Focal-spot area comparison squares the diameter ratio for circular spots. Negative reduction means the radial-polarization spot is larger.1
Compare radial- and linear-polarization focal spot diameters and areas.
When to use Radial-Polarization Spot Comparison
Use this tool to compare radial- and linear-polarization focal spot diameters and areas.
Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
How to use Radial-Polarization Spot Comparison and understand its results
- Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
- Enter radialSpotDiameterMicrometers, linearSpotDiameterMicrometers using the field table and calculation rules, then run the tool.
- Read diameterRatio, areaReductionPercent. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| radialSpotDiameterMicrometers | Radially polarized spot diameter (µm) | number; minimum: 0 | Required |
| linearSpotDiameterMicrometers | Linearly polarized spot diameter (µm) | number; minimum: 0 | Required |
Enter nonnegative radial and positive linear diameters in µm. Return ratio and signed area reduction.
ratio=radialDiameter/linearDiameter; reduction%=100(1−ratio²) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| diameterRatio | Radial-to-linear diameter ratio | number; minimum: 0 |
| areaReductionPercent | Spot-area reduction (%) | number |
{
"input": {
"radialSpotDiameterMicrometers": 0.4,
"linearSpotDiameterMicrometers": 0.5
},
"output": {
"diameterRatio": 0.8,
"areaReductionPercent": 35.999999999999986
}
}Limitations and assumptions
No high-NA field calculation, spot-shape correction or polarization calibration is supplied.
Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Focused-Beam Waist Location: Propagate a Gaussian beam q parameter through a thin lens to locate the new waist. For a complementary task, use Confocal Lateral Resolution: Estimate confocal lateral FWHM and a simple finite-pinhole adjustment.
References
-
Radial-Polarization Spot Comparison — tool.io
Similar or alternative tools
- Focused-Beam Waist Location
Propagate a Gaussian beam q parameter through a thin lens to locate the new waist.
- Confocal Lateral Resolution
Estimate confocal lateral FWHM and a simple finite-pinhole adjustment.