Ultrafast spectroscopy of the stripe phase of underdoped La$_{2-x}$Sr$_{x}$CuO$_{4}$ thin films

We have performed ultrafast measurements on high-T$_c$ thin films of underdoped La$_{2-x}$Sr$_{x}$CuO$_{4}$. In these experiments, femtosecond pulses create photoexcitations derived from both the superconducting and striped phase fraction whose evolution and decay are probed as a function of time. We discuss the separate dynamics of these two electronic components as a function of temperature and excitation density.