In view of the fact that the temperature dependence of
n·
l product (equal to the real optical path length) of the optical materials are very important for designing optical devices, here we report the measured results for many optical materials, e. g., LiNbO
3, LiTaO
3, YAG (Nd), opto-ceramics, etc. We measured them by Haidinger's fringe count method over the practical temperature range of 20°C-120°C.
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