Aging characteristics of deuterium lamps were studied. From the measurements of spectra in the UV and VUV regions and the degradation of window glasses of deuterium lamps, it was found that the degradation of window glass in the degradation of deuterium lamp was more than 50%. The aging characteristic of deuterium lamp and the degradation of window glass could be improved by exchanging window glass material (exchanging non-doped silica glass for fluorine-doped silica glass). But on the deuterium lamp which has long nose (the distance between the window glass and the light source is about twice longer than that of regular deuterium lamp and the radiant flux at the window glass was about quarter of regular deuterium lamp), the aging characteristic of lamp and the degradation of window glass were not improved. In order to suppress the degradation of deuterium lamp, it appeared that exchange of window glass material is effective.
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