This work was Jointly supported by the Combined Research Foundation, the National Natural Science Foundation of China, the Energy Conservation Investment Corporation of China (60177029), the Science Fund for Distinguished Young Scholars of Heilongjiang P
Heat treatment with the presence of hydrogen (H2) that react with GeE' centers (Ge≡) at high temperature will weaken the refractive index modulation of grating fabricated in hydrogen-loaded normal germanosilicate fib...