Probing the Heavy Quark Content of the Photon Using b Tagging at Electron Photon Colliders

We study the prospects for probing the quark content of the photon using b tagging at high energy electron-photon colliders. We find that heavy quark tagging provides a sensitive and effective probe of the quark content of the photon. Using a 500 GeV $e^{+}{e}^{-}$\ NLC in electron-photon mode, the cross section for $e{b}_{\gamma }\to eb$\ can be measured to 10% with b tagging. This is sufficient to differentiate between the various photon structure functions.