A measuring technique for spectral distribution of light sources using an acoustooptic tunable filter

概要

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This paper describes the characteristics of spectrometer and the measuring technique for spectral distribution in the visible wavelength region using an Acoustooptic Tunable Filter (AOTF) employing a TeO_2 crystal.The contents of this paper are summarized as follows : (1) The polarization properties of the diffracted lights of an AOTF are linear polarization. (2) The diffracted light distribution can be approximated to the Gaussian distribution. (3) The resolving power of the wavelength of the diffracted light is smaller than 3 nm. (4) The wavelength accuracy of the diffracted light is about 0.002 nm/kHz.(5) The error of the spectral distribution is less than ±1% over the range of 380〜500 nm and ±0.5% at the longer than 500 nm. (6) The wavelength and spectral transmittance of an AOTF can be controlled electronically without any mechanical means.
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