Abstract: A lasing device includes an active layer comprising a cholesteric liquid crystal material and a laser dye, and a liquid crystal cell including spaced apart substrates defining a cell gap in which the active layer is disposed. The substrates include electrodes arranged to bias the active layer into an oblique helicoidal (ChOH) state. At least one substrate of the liquid crystal cell is optically transparent for a lasing wavelength range of the device.

Abstract: A lasing device includes an active layer comprising a cholesteric liquid crystal material and a laser dye, and a liquid crystal cell including spaced apart substrates defining a cell gap in which the active layer is disposed. The substrates include electrodes arranged to bias the active layer into an oblique helicoidal (ChOH) state. At least one substrate of the liquid crystal cell is optically transparent for a lasing wavelength range of the device.

Abstract: The unitary, hand held tool is comprised of a body portion having first and second ends. The body has a length dimension which is sufficient to span the distance between the centers of at least three outer link plates of a multi-link roller chain. The first and second fixed prongs emanate from, are integral with the body portion, and are preferably angled towards one another. The fixed prong adjacent to the first end of the body portion, and the second fixed prong adjacent to the second end of the body portion extend from the linear body portion in substantially the same plane. The prongs are dimensioned to fit into the openings between spaced apart rollers of a multi-link roller chain, and long enough to secure such spaced apart rollers when fit into such openings.