Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Spectra of the used dyes after two-photon excitation, measured by a fiber-coupled spectrometer within the focal spot. Excitation wavelength is 830 nm. (1) Rhodamine green, (2) Texas red. The spectra are not notably different compared with one-photon excitation at the respective absorption maxima. The transmission characteristics of dichroic mirror (3) and filters [(4) and (5)] used for spectral separation of the emission light are also indicated.
