code: def save_photon_hdf5(self, identity=None, overwrite=True, path=None):
          
          filepath = self.filepath
          if path is not None:
              filepath = Path(path, filepath.name)
          self.merge_da()
          data = self._make_photon_hdf5(identity=identity)
          phc.hdf5.save_photon_hdf5(data, h5_fname=str(filepath),
                                    overwrite=overwrite)
docs: Create a smFRET Photon-HDF5 file with current timestamps.