Pick your favorite chromophore: a fairly comprehensive list of chromophores/fluorophores complete with UV-Vis, fluorescence spectra, fluorescence quantum yields, and extinction coefficients
RP Photonics Encyclopedia of Laser Physics and Technology: for general knowledge regarding a huge variety of optical processes, including detailed explanations of all of the nonlinear optical processes we utilize in our lab, and the theory of operation of many different types of lasers
Igor Pro Manual and Igor Exchange , the user-to-user based help forum