✨
Two-Photon Absorption Calculator
Calculate two-photon absorption rates and nonlinear optical parameters
Formula: R2PA = σ2 × C × l × I2
Where σ2 is the TPA cross-section (in GM), C is concentration, l is path length, and I is laser intensity.
Where σ2 is the TPA cross-section (in GM), C is concentration, l is path length, and I is laser intensity.
Optical & Sample Parameters
Calculation Results
⚠️ Two-photon absorption (TPA) processes depend quadratically on laser intensity ($I^2$). Calculations require high peak-power pulsed lasers (typically femtosecond or picosecond sources) to achieve noticeable absorption without thermal sample damage [cite: "Calculators Tools - Correct"].