Signatures of extra dimensions at e gamma and gamma gamma colliders

We study the processes gamma e --> gamma e and gamma gamma --> gamma gamma, in the context of the proposal for Weak Scale Quantum Gravity (WSQG) with large extra dimensions. With an ultraviolet cutoff M-S similar to 1 TeV for the effective gravity theory, the cross sections obtained for these proces ses at the Next Linear Collider (NLC), with the e gamma an gamma gamma opti ons, deviate from the predictions of the Standard Model significantly. Our results suggest that, for typical proposed NLC energies and luminosities, t he predictions of WSQG can be tested in the range 1 TeV less than or simila r to M-S less than or similar to 10 TeV, making e gamma an gamma gamma coll iders important tools for probing WSQG.