Patent ID: 7405824

Claim:
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.