Abstract: According to one embodiment of a method of generating synthesized light, a light emitter emits a first light element and a second light element, the synthesized light includes the first light element and the second light element, the first light element passing through a first optical path propagates toward a first direction, the second light element passing through a second optical path propagates toward a second direction, the first optical path has a first optical path length, the second optical path has a second optical path length, the first optical path length is different from the second optical path length, and the first direction is different from the second direction.

Abstract: To improve the production yield rate of a synthesis corundum cell superior in translucency, chemical resistance or an optical component comprising calcium fluoride. On the other end side of synthetic corundum piece, spacer intervenes between the surfaces which will be bonded. The spacer is crushed flat by pressure force which effects the other end side of synthetic corundum piece in the case of heat-treatment after the temporary bonding. Thereby, the spacer does not disturb the synthetic optical contacting or chemical pressurized fusion bonding state of corundum piece.

Abstract: Ground joint surfaces of two synthetic corundum pieces 4, 5 are supeposed on each other, and ends thereof are held in intimate contact with each other. The synthetic corundum pieces are then heated at a temperature equal to or lower than the melting point of synthetic corundum to joint the synthetic corundum pieces 4, 5.