Abstract: An optical fiber device has a fiber core, a cladding layer around the fiber core and a plurality of tilted fiber Bragg gratings, FBGs, in the fiber core at a sequence of positions along the optical axis of the fiber core. The tilted FBGs are configured to reflect and transmit respective non zero fractions of the optical power of light with a predetermined optical reflection wavelength defined by the tilted FBG from the fiber core at the position of the tilted FBG. The tilted FBGs having a tilt angle in an angle range wherein the tilted FBG reflects light from the fiber core perpendicularly to the fiber core or with a deviation from perpendicular reflection at which the reflected light does not give rise to cladding mode generation at the predetermined optical reflection wavelength of the tilted FBG.

Abstract: The invention relates to a method and device of inspecting contamination particles on an object comprising a patterned structure. The device includes a radiation system for directing a radiation beam to the object. The object is configured to scatter the beam. The device also includes an optical system arranged to receive scattered radiation from the object, and a filter provided in the optical system. The filter is associated with the patterned structure so as to filter out radiation from the scattered radiation. The device also includes a detector arranged to detect a fraction of radiation that is transmitted by the filter. Accordingly, contamination particles may be detected quickly and accurately.

Abstract: A method for separating a lump piece of rosette plants. The method includes the steps of gripping a rosette plant and positioning it parallel to a longitudinal axis of an elongated holder which has a longitudinal opening at least along the longitudinal axis; introducing a part of the lump piece of the rosette plant into the holder via the mentioned longitudinal opening; cutting off the lump piece along a cutting plane parallel to the longitudinal axis, while closing the longitudinal opening, such that the introduced part of the lump piece is enclosed in the holder; and removing the enclosed cut-off part of the lump piece from the holder. The method includes the further step of cutting off a part of the rosette plant enclosed in the holder along a second cutting plane.