Patent ID: 7965147

Claim:
A physics package apparatus for an atomic clock comprising: a block that comprises: a plurality of faces on an exterior of the block positioned at predetermined angles to one another; a central bore that extends from one of the faces of the block through the block to an opposing face of the block; one or more measurement bores, each of which extends from one of the faces of the block through the block to the central bore; a plurality of light paths, each of which extends from one of the faces of the block at a predetermined angle relative to the angle of the face from which it extends through the block to another face of the block, wherein each of the light paths intersects with one other of the light paths at one of the faces of the block; a plurality of optically clear windows, one of which is fixedly attached using a vacuum tight seal to one of the faces of the block over one of the locations where one of the light paths intersects with one other of the light paths and the remainder of which are fixedly attached using a vacuum tight seal over exterior openings of the measurement bores; a plurality of mirrors, each of which is fixedly attached using a vacuum tight seal to one of the faces of the block over the other locations where one of the light paths intersects with one other of the light paths; an inlet fill tube fixedly attached using a vacuum tight seal to a first face of the block; and an outlet fill tube fixedly attached using a vacuum tight seal to a second face of the block.