  Theories with large extra dimensions predict an infinite tower of
Kaluza-Klein states in the 1 TeV range, which can consequently have significant
implications for experimental observables. One such observable, which gets
affected by the exchange of spin-2 Kaluza-Klein particles, is the t t(bar)
production cross-section in photon-photon collisions at NLC energies. We study
this process and obtain bounds on the effective quantum gravity scale M_S
between 700 and 2400 GeV (depending on the centre-of-mass energy). We show that
the use of polarisation will further strengthen these bounds.
