Optical device

Abstract

The present invention provides an optical apparatus, which restrains the cling of the foreign body at a low cost, furthermore avoids the heat bond of the optical fiber in the high-capacity density range, and increases the reliability of the illuminating source. The optical fiber (1) is provided with an illuminating source (LD); a collection lens (3), which gathers the light beams (B) sent from theilluminating source (LD); a dielectric block (4), which is arranged at the optical path of the light beam (B) which has passed through the collection lens (3); the optical fiber (30), which is arranged with the mode that the light beam (B) passed through the dielectric block (4) inject by the core (5) of the injected end plane (30A). At least the injected end plate (5a) of the core (5) is locatedat the position of the emission end plane (4b) which is far from the dielectric block (4), with pressing the injected end plane (5a) part of the surrounding core (5) in the injected end plane (30A) of the optical fiber (30) to the dielectric block (4), it forms the hermetic room (SA) of the injected end plane (5a) in the surrounding core (5).

Description

technical field [0001] The invention relates to an optical device, in particular to an optical device for coupling a light beam emitted by a light source with an optical fiber. Background technique [0002] Conventionally, in an optical device that condenses a light beam emitted by a light source using an optical system and couples it to an optical fiber, the method described below is used to set an oblique cut on the light source side on the optical path of the light beam passing through the optical system. The transparent dielectric block reduces noise generated by light reflected at the incident end face of the optical fiber returning to the light source by optically contacting the optical fiber with the non-obliquely cut side (exit end face) of the dielectric block. [0003] However, in the above-mentioned optical equipment, there is a problem that foreign matter adheres to (dust collects) around the component provided on the optical path, thereby degrading the optical c...

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Problems solved by technology

[0007] In addition, the present inventors found that when the oscillation wavelength of a light source such as a laser is 160 nm to 500 nm, the power density of the light beam passing through the incident end face of the optical fiber and / or the exit end face of the dielectric block is 1.0 mW / μm 2 In the high power density region, the incident end face of the fiber is in optical contact with the exit end face of the dielectric block, and if the light source generates a light beam, the incident end face of the core is thermally bonded to the exit end face of the dielectric block, so that due to the shedding of the fiber or The vibration causes the incident end face of the optical fiber and / or the exit end face of the dielectric block to peel off, generate defects, and reduce the light transmittance

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