Enter optical power P and wavelength λ; compute the photons per second (photon flux) N = P·λ/(hc), for comparing single-photon flux of different wavelengths in optical detection and quantum-source estimates.
输入光功率 P 与波长 λ，求光子通量。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Photon flux | Φ = N_ph/(A·t) | Photometry |
| Relation to power | Φ = P/(hν) = Pλ/(hc) | Optoelectronics |
| Units | photons/(s·m²), einstein | Photochemistry |
| Irradiance | E = P/A | Radiometry |
| Photon counting | Scale by detector quantum efficiency | Detector physics |
| Applications | Photosynthesis, PV, photocatalysis | Applied optics |