Non-destructive optical methods for assessing defects in production of Si or SiGe materials V. Higgs, N. Laurent, C. Fellous and D. Dutarte Eur. Phys. J. Appl. Phys., 27 1-3 (2004) 43-48 Published online: 15 July 2004 DOI: 10.1051/epjap:2004075