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Low loss, optical channel waveguides have been successfully produced by high repetition rate femtosecond laser inscription in a Li–Zn fluoroborate glass (64.9B2O3 + 25Li2O + 10ZnF2 + 0.1Er2O3). High quality waveguides were produced at 500 kHz, 1 MHz and 2 MHz laser repetition rates, showing a refractive index contrast in the range of 3–6 × 10−3 depending on laser fluences. Dependence of experimental...
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