Side Injection Device

Abstract

The invention provides a side injection device that prevents deterioration of the coupling efficiency at the welded portion between the rod lens and the prism, can make the outer diameter extremely thin, and can also extend the distance to the beam waist. The side injection device of the present invention has: an optical fiber (2); a rod lens (3) with one end fused to the end face of the optical fiber; and a prism (4) fused to the other end of the rod lens, and the prism has a cylindrical outer periphery A part of the rod lens is cut off to form the basic shape of a planar exit surface (4c) parallel to the axis. In the welded part between the rod lens and the prism, the outer diameter of the welded end surface of the rod lens is equal to that of the prism Below the minimum diameter of the welded end surface of the rod lens, the welded end surface of the rod lens does not protrude from the welded end surface of the prism, and the center O1 of the welded end surface of the rod lens is aligned with all of the prism The arc center O2 of the welding end face is eccentric.

Description

technical field [0001] The present invention relates to a side emitting device that emits light propagating in an optical fiber to the side that forms an angle with respect to the optical axis of the optical fiber, in particular to a side emitting device suitable for use as an optical probe for OCT (Optical Coherence Tomography) Injection device. Background technique [0002] OCT is to insert the optical probe into the patient's blood vessels, intestines and other organs, emit low coherent light from the front end to the side, and use the light reflected from various parts inside the subject to obtain the precision inside the subject. The optical coherence tomography method of the tomographic image, its basic technology is disclosed in Japanese Patent Publication No. 6-35946 (Patent Document 1), and the specific structure of the optical probe is disclosed in WO2011 / 074051 International Publication Bulletin (Patent Document 2 ), Japanese Patent No. 4659137 (Patent Document 3...

AI Technical Summary

Problems solved by technology

At this time, although the outer diameter of the side injection device can be made extremely thin, if Figure 16 As shown, there is a problem that the beam 5 protrudes outside the prism 44 at the welded part of the rod lens 3 and the prism 44, thereby deteriorating the coupling efficiency and degrading the performance of the side emitting device.

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