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The adjustable range of resonance wavelengths of long-period gratings was broadened toward the blue side by heating, and the mechanism was studied. The large blue shift, 41 nm, was obtained by heating at 600degC.
It was shown that the glass structure relaxed more slowly than the residual stress with decreasing heating temperature and the blue shift of resonance wavelengths caused by the residual stress relaxation appeared more largely.
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