| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact, low-cost lens-functioned composite optical element configured to easily perform the optical coupling of an incident side and an exit side of an optical element.SOLUTION: The lens-functioned composite optical element includes: a first spherical lens 1a having a refractive index nl; a second spherical lens 1b having a refractive index n2; and the optical element 3 disposed between the lenses 1a and 1b. The refractive index n1 is different from the refractive index n2, and the curvature center of the first spherical lens 1a is aligned with that of the second spherical lens 1b. The low-cost lens-functioned composite optical element where the numerical aperture of the incident side is made different from that of the exit side can be provided. |
