Two-Photon Absorption Calculator

How to Use This Calculator

Enter the transition rate (W) and intensity (I) values into the respective input fields. The calculator will automatically compute the two-photon absorption cross-section (σ).

Purpose of This Calculator

The Two-Photon Absorption Calculator is used in nonlinear optics and photonics research to determine the two-photon absorption cross-section based on the transition rate and light intensity.

Formula

σ = W / I²

Where:

  • σ = two-photon absorption cross-section (cm⁴·s/photon)
  • W = transition rate (s⁻¹)
  • I = intensity (W·cm⁻²)

Example Calculation

If the transition rate is 5 × 10⁴ s⁻¹ and intensity is 2 × 10³ W·cm⁻², then:

σ = 5×10⁴ / (2×10³)² = 5×10⁴ / 4×10⁶ = 0.0125 cm⁴·s/photon

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