Multi-wavelength light radiating apparatus

A multiwavelength-light-radiating apparatus used for action spectrum analysis to investigate wavelength dependence of responses of samples irradiated with monochromatic lights, comprising:

• a light source that radiates continuous light;
• a diffracting part that diffracts the continuous light into numerous monochromatic lights, whose wavelengths differ from one another, and emits the monochromatic lights;
• numerous optical waveguides that respectively receive the monochromatic lights emitted from the diffracting part at incident ends of the optical waveguides and emit the monochromatic lights from output ends;
• and
• a sample-placement part configured to individually hold numerous samples so as to be simultaneously and individually irradiated by the respective monochromatic lights emitted from the output ends of the optical waveguides;
• and adjusting filters that adjust the light intensities of the monochromatic irradiation lights;
• wherein:
• the adjusting filters are respectively interposed between the output ends of the optical waveguides and the sample-placement part;
• and adjusting filters individually adjust the light intensities of the monochromatic lights radiated onto each of the numerous samples, so that a light irradiation condition, other than wavelength, of the monochromatic lights radiated onto each of the numerous samples is uniformized among said numerous samples.