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Using ultrafast optical techniques, we detect two types of bosons stronglycoupled to electrons in the family of Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$from the underdoped to overdoped regimes. The different doping dependences ofthe electron-boson coupling strengths enables us to identify them as phononsand spin fluctuations: electron-phonon coupling ($\lambda_{e-ph}$) peaks atoptimal doping, and electron-spin fluctuation coupling ($\lambda_{e-sf}$)decreases monotonically with doping. This observation is consistent with twofacts: (1) superconductivity is in close proximity with antiferromagnetism atlow dopings, and (2) a pronounced lattice renormalization effect at largerdopings.

Doping dependence of the electron-phonon and electron-spin fluctuation  interactions in the high-$T_{c}$ superconductor  Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$