Optical coupling system of light measuring device and sample

An optical system coupling a light measuring device and a sample, wherein excitation light emitted by a light source is guided through an excitation light optical fiber to irradiate the sample, and excited light emitted by the sample is guided to an optical detection system through a receiving light optical fiber, the optical system comprising:

• a light measuring device including
• an excitation light optical fiber for guiding an excitation light to irradiate a sample,
• a receiving light optical fiber for receiving excited light from the sample, and
• a coupling lens arranged on a sample side of the excitation light optical fiber and the receiving light optical fiber;
• and
• a sample container including a cylindrical body for retaining the sample to which the excitation light is irradiated, and
• a lens portion integrally formed on a bottom of the cylindrical body for collecting the excitation light and the light emitted from the sample;
• wherein the excitation light is changed to parallel light or converged light by the coupling lens and collected at the sample by the lens portion.