| 摘要 |
A light source apparatus includes excitation light sources; a phosphor unit; a dichroic mirror that reflects excitation light supplied from the excitation light sources toward the phosphor unit and that transmits fluorescent light emitted from the phosphor unit; and a collimator lens that is provided between the dichroic mirror and the phosphor unit and whose focal distance varies according to the wavelength. The phosphor unit is arranged at a position determined by the focal distance of the collimator lens for the fluorescent wavelength. The collimator lens includes low-dispersion lenses and a high-dispersion lens.
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