| 摘要 |
PURPOSE:To make it possible to correct the dispersion of oscillation frequency difference between two semiconductor laser elements, by a method wherein two semiconductor elements arranged on a heat sink with temperature gradient are used as a laser light source, and the temperature gradient is produced also between the two elements. CONSTITUTION:Semiconductor laser elements 1 and 2 having different oscillation frequencies are used, whose injection current can be controlled by a current controlling part 3. Further, the elements 1 and 2 are arranged along a temperature gradient on a heat sink 4 on which the temperature gradient is produced. This temperature gradient is produced from both ends of the heat sink 4 as the result of a specific temperature control applying a temperature controlling part 5. As the temperature gradient of the heat sink 4 can be controlled by the temperature controlling part 5, the temperature gradient can be produced also between the two semiconductor laser elements 1 and 2. Thereby, a desired frequency difference ¦f1-f2¦ can be obtained in response to the temperature gradient rather simply and exactly.
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