| 摘要 |
1,027,737. Lasers. NATIONAL RESEARCH DEVELOPMENT CORPORATION. May 14, 1964 [May 14, 1963], No. 19007/63. Heading H3B. [Also in Division H1] In a construction in which a semi-conductor diode is mounted between two end plates, a spacer, mounted between the end plates to hold them rigidly, is of a material of a coefficient of expansion similar to that of the diode. A semi-conductor diode 1, Fig. 2 (not shown), of gallium arsenide or phosphide, is mounted between two molybdenum plates 5, 6, the plate 5 being plated with gold and tin for contact with N-type region 2 and plate 6 being plated with gold and zinc for contact with P- type region 3. These plates serve as electrical contacts and are large enough to act as heat sinks. They are further held appropriately spaced by a member 7 of coefficient of expansion similar to that of the device 1 and, to ensure this similarity, the member 7 is preferably made from a semi-insulating form of the same material as the device 1. A sector of the spacer 7 is cut away to allow the passage of radiation emitted and, if desired, a second sector, opposite to the first, may be cut away to permit silvering of the rear face of the diode after the whole device has been assembled. |
