| 摘要 |
PROBLEM TO BE SOLVED: To provide a semiconductor laser that can obtain stable APC driving regardless of the deterioration of an semiconductor laser element due to continuous oscillation for a long time. SOLUTION: This semiconductor laser is provided with such a structure that a light receiving element is provided to make transmitting light from window glass be laser beam light by outgoing light from a semiconductor laser element, and to receive reflection light by the window glass.
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