Strehl Ratio (Maréchal) calculator
Approximate Strehl ratio from RMS wavefront error.
Category: Aberrations
Formula: S ≈ exp(-(2π·σ)²)
Inputs
| Input | Parameter | Unit | Default |
|---|---|---|---|
| RMS WFE σ | sigma | λ | 0.07 |
Result with the default inputs
- Strehl: 0.8241
- Diffraction-limited: ✓ yes
Open it with your own values: put each input in the address as a parameter, for example /calculators/strehl-ratio-marechal?sigma=0.07. A unit other than the listed one goes in <parameter>_unit.
Read more: Wikipedia: Strehl ratio