Optical fiber coupler for thermal lens analysis, thermal lens analyzer

摘要

To provide an optical fiber coupler for thermal lens analysis with which it is possible to suppress the attenuation of intensity of a laser beam emitted from a light source to an extremely low level and cause it to enter a thermal lens analyzer, and a thermal lens analyzer equipped with the optical fiber coupler.SOLUTION: An optical fiber coupler comprises at least a first optical fiber connected to a first light source that emits a first laser beam having a first wavelength at one end, a second optical fiber connected to a second light source that emits a second laser beam having a second wavelength at one end, a confluence part where the first optical fiber and the second optical fiber join together; and a fusion part extending from the confluence part, at which the first optical fiber and the second optical fiber are integrally fused. In the fusion part, EL/Ab≤0.25 is satisfied, where El (db) represents the loss amount of the first laser beam and Ab represents the absorbance of a sample.SELECTED DRAWING: Figure 1