Monochromatic Light Source with Variable Wavelength using an Acoustooptic Tunable Filter and Its Applications for Spectrometry

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  • 音響光学フィルタを用いた可変波長光源と分光測定への応用
  • オンキョウ コウガク フィルタ オ モチイタ カヘン ハチョウ コウゲン ト

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The construction of a light source with variable wavelength utilizing a combination of an Acoustooptic tunable filter employing a TeO2 crystal and an incoherent white light source, of which the wavelength and intensity of the optical output is to be arbitrarily controlled, are described. As example of applications, an automatic measuring method for spectrometory are proposed.<BR>As a result, the following conclusions are obtained.<BR>(1) The optical output power of the apparatus depends on the wavelength characteristics of the feedback system.<BR>(2) The spectral reflectance characteristics can be measured automatically by using the combination of a light source with variable wavelength and a microcomputer.<BR>(3) The measurement time of the spectral reflectance characteristics is about 10 minutes.<BR>(4) The spectral sensitivity and the spectral transmittance characteristics were expressed on an oscilloscope as still picture of the periodic time T≅40ms.

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