Igor Yadroitsev, Ina Yadroitsava, Philippe Bertrand, Igor Smurov, (2012) "Factor analysis of selective laser melting process parameters and geometrical characteristics of synthesized single tracks", Rapid Prototyping Journal, Vol. 18 Issue: 3, pp.201-208, https://doi.org/10.1108/13552541211218117
Paper available for review in the Google Book
Nowadays to increase productivity of SLM process, high laser power up to 400 W and high scanning speed up to 3 m/s are used.
Smaller thickness of layer allows for better accuracy of the manufactured part. But increases manufacturing time. (page 122 of the book)