Patent ID: 11971431
Assignee: KABUSHIKI KAISHA NIHON MICRONICS
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. The optical probe according to claim 1, wherein:
the first region has a configuration in which a tip-end part connected to the tip-end surface is joined to a connection part connected to the second region;
a mode field diameter of the tip-end part is constant;
a mode field diameter of the connection part is smaller than or equal to the mode field diameter of the tip-end part at a joined surface between the tip-end part and the connection part, and the connection part includes a region in which the mode field diameter is gradually decreased from the joined surface in the central-axis direction; and
a length of the tip-end part in the central-axis direction is set such that the optical signal entering the tip-end surface passes through the joined surface in parallel to the central-axis direction.