| 摘要 |
PURPOSE:To emit light, whose wavelength is swept in a sine wave state with respect to time, by deflecting a light path in a spectroscope by the vibration of a tunin fork and dividing the luminous flux, which is guided into the spectroscope and has a spectral structure. CONSTITUTION:A diffraction grating 23 as a spectroscopic element, which receives reflected luminous flux from a collimator mirror 22 and divides the flux, is arranged in a light path of the luminous flux. The luminous flux, whose wavelength is scattered by said spectroscopic element, advences to a collector mirror 25. A wavelength modulator 29' using amirror utilizes a U shaped tuning fork 30 having two legs. A reflecting mirror 31 is vibrated by a driving mechanism at a frequency in the vicinity of the natural frequency of the tuning fork. The path of the liminous flux, which is introduced in the main body of the spectroscope, is deflected by the vibration of the reflecting mirror 31. |
