Abstract: A spark gap switch is disclosed. The spark gap comprises opposite and adjacent electrodes and a trigger arrangement for triggering a discharge arc between the opposite and adjacent electrodes. The trigger arrangement includes a solid insulative material to facilitate a discharge between trigger electrodes to trigger the spark gap. The trigger arrangement is located rearwardly of the adjacent electrode to position the solid insulative material in a manner to prevent a main discharge arc affecting the structural integrity of the solid insulative material. Such an arrangement provides protection for the solid insulative material to increase lifetime of the unit and has the capability of reducing jitter.

Abstract: A dye cell holder adapted for removable engagement with a support in a dye laser arrangement is disclosed. The holder is particularly adapted to hold thin fragile dye cells. The holder comprises means for supporting such fragile cell which contains a dye solution and is to be pumped by a laser beam. The dye cell is retained against the support by a retaining means which is movable relative to the support in a manner to provide access to permit insertion of the dye cell into the holder and to permit removal of the cell from the support means.