Kerr-Gate Suppression
Measure Kerr-gate background suppression, desired-signal transmission, and SNR improvement.
Description
Kerr-gate performance compares background suppression with desired-signal transmission.
Kerr-gate performance compares background suppression with desired-signal transmission. Their combined ratios quantify signal-to-background improvement.1
Measure Kerr-gate background suppression, desired-signal transmission, and SNR improvement.
When to use Kerr-Gate Suppression
Use this tool to measure Kerr-gate background suppression, desired-signal transmission, and SNR improvement.
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 Kerr-Gate Suppression 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 ungatedBackground, gatedBackground, ungatedDesiredSignal, gatedDesiredSignal using the field table and calculation rules, then run the tool.
- Read backgroundSuppressionDb, signalTransmissionPercent, snrImprovementFactor. 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 |
|---|---|---|---|
| ungatedBackground | Ungated background signal | number; minimum: 0 | Required |
| gatedBackground | Kerr-gated background signal | number; minimum: 0 | Required |
| ungatedDesiredSignal | Ungated desired signal | number; minimum: 0 | Required |
| gatedDesiredSignal | Kerr-gated desired signal | number; minimum: 0 | Required |
Enter positive background and ungated desired signals with nonnegative gated desired signal. Return dB, transmission and improvement.
suppressionDb=10log10(Bungated/Bgated); transmission%=100Sgated/Sungated; improvement=(Sgated/Bgated)/(Sungated/Bungated) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| backgroundSuppressionDb | Background suppression (dB) | number |
| signalTransmissionPercent | Desired-signal transmission (%) | number; minimum: 0 |
| snrImprovementFactor | Signal-to-background improvement | number; minimum: 0 |
{
"input": {
"ungatedBackground": 100,
"gatedBackground": 1,
"ungatedDesiredSignal": 50,
"gatedDesiredSignal": 25
},
"output": {
"backgroundSuppressionDb": 20,
"signalTransmissionPercent": 50,
"snrImprovementFactor": 50
}
}Limitations and assumptions
This ratio uses signal/background, not a measured noise standard deviation. No gate dynamics or noise statistics are modeled.
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 Plasma-Mirror Contrast: Calculate plasma-mirror pulse-contrast improvement from differential reflectivity. For a complementary task, use SRS Contrast: Calculate stimulated Raman loss contrast from pump-on and pump-off probe measurements.
References
-
Kerr-Gate Suppression — tool.io
Similar or alternative tools
- Plasma-Mirror Contrast
Calculate plasma-mirror pulse-contrast improvement from differential reflectivity.
- SRS Contrast
Calculate stimulated Raman loss contrast from pump-on and pump-off probe measurements.