We report efficient generation of tunable femtosecond pulses in the red by internal frequency doubling of an optical parametric oscillator (OPO) based on periodically poled $\mathrm{Li}\mathrm{Nb}{\mathrm{O}}_3$ (PPLN). The OPO, based on a 1-mm-thick PPLN crystal, is synchronously pumped by a femtosecond Ti:sapphire laser at $810\mathrm{nm}$ , providing signal pulses across $1.33–1.57\mu \mathrm{m}$ at a $76\mathrm{MHz}$ repetition rate. Using a 1-mm-thick crystal of $\mathrm{Bi}{\mathrm{B}}_3{\mathrm{O}}_6$ (BIBO) internal to the OPO cavity, we achieve frequency doubling of signal pulses across $665–785\mathrm{nm}$ with up to $260\mathrm{mW}$ of average power for $1.51\mathrm{W}$ of pump. The high nonlinear gain and phase-matching acceptance in PPLN and BIBO permit convenient tuning across the full range by simple detuning of OPO cavity delay. Intracavity dispersion compensation results in near-transform-limited red pulses with durations down to $140\mathrm{fs}$ for $185\mathrm{fs}$ input pump pulses.