Abstract: The invention relates to a spatial phase filter capable of receiving an incident light beam so as to transmit it to a single mode output fibre comprising a spatially variable phase profile and being adapted to excite the evanescent modes of the output fibre. The profile has: an adjustable pattern with a phase distribution substantially corresponding to a combination of at least one quantile of normal distribution on at least one dimension (301); and a phase shifting zone support (320) limited in relation to the incident beam according to the dimension(s). The invention also relates to a system implementing several filters and a method for filter calculating.

Abstract: A piston for internal combustion engines made of a light alloy and comprising a skirt portion and a head portion, having a ceramic insert adapted on the head portion and connected to same by mechanical locking. The ceramic insert is provided with pores at least on the portion engaging the piston head. The pores have a size which enable them to be filled with the light alloy during the manufacture of the piston by the squeeze casting method.