We study waveguide writing in various transparent dielectric materials using a highly flexible chirped-pulse femtosecond oscillator (CPO) as the laser source. This unique device allows us to investigate an unprecedented parameter range up to 5.2 MHz in repetition rate, 50 fs-2 ps in pulse duration and up to 600 nJ in energy per pulse. Thus the CPO closes the gap between high energy amplifier- and high repetition oscillator-direct waveguide writing.
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