Thank you all for your opinions! What's the meaning of "strong background"? I am now typing my MSc thesis and my current research area is in nonlinear optics. Nine papers have been submitted to or accepted by international journals (but only one first author paper and eight co-auther papers) and several international conference papers. The subject I applied is in experimental solid state physics especially in the magneto optics and magneto-/spin dynamics. Could you give some advice? Thanks a lot!