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We determined electronic relaxation times via pump-probe optical spectroscopyusing sub-15 fs pulses for the normal state of two different cupratesuperconductors.We show that the primary relaxation process is theelectron-phonon interaction and extract a measure of its strength, the secondmoment of the Eliashberg function\lambda<\omega^{2}>=800\pm200 meV^{2} forLa_{1.85}Sr_{0.15}CuO_{4} and \lambda<\omega^{2}>=400\pm100 meV^{2} forYBa_{2}Cu_{3}O_{6.5}. These values suggest a possible fundamental role of theelectron-phonon interaction in the superconducting pairing mechanism.

Electron-Phonon Coupling in High-Temperature Cuprate Superconductors Determined from Electron Relaxation Rates