  We have studied dijet production in $\gamma \gamma$ collisions with a view to
probing the physics of large extra dimensions. The exchange of virtual spin-2
Kaluza-Klein excitations is found to modify the dijet cross-section
substantially from its Standard Model value and allows the effective string
scale to be probed to values between 2.5 and 6.4 TeV in the unpolarised case.
In the case where the photons are polarised, the limits are seen to improve by
roughly 20%. Dijet production in $\gamma \gamma$ collisions is thus shown to be
a very effective probe of large extra dimensions.
