| 摘要 |
A window of a CAN package is sealed by a circular transparent plate member and a cylindrical transparent member. The diameter of the cylindrical transparent member is equal to the diameter of the window, and the thickness thereof is 1 mm. The distance from a semiconductor laser LD to a light output surface of the circular transparent member is approximately 1 mm, and the distance from the semiconductor laser LD to a light output surface of the cylindrical transparent member is approximately 2 mm. The output of the semiconductor laser LD is 800 mW, and the transmittance area of a laser beam at the light output surface of the transparent member is approximately 0.70 mm2 (1/e). The light density at the light output surface of the transparent member is 1.14 (W/mm2). Deterioration in transmittance rates can be suppressed if the light density at the light output surface of the transparent member is 1.15 or less.
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