title: Slit beam shaping method for femtosecond laser direct-write fabrication of symmetric waveguides in bulk glasses.
abstract: We report both theoretical and experimental results of a slit beam shaping configuration for fabricating photonic waveguides by use of femtosecond laser pulses. Most importantly we show the method supports focusing objectives with a long depth of field and allows the direct-writing of microstructures with circular cross-sections whilst employing a perpendicular writing scheme. We applied this technique to write low loss (0.39 dB/cm), single mode waveguides in phosphate glass.
authors.forename: Martin
authors.initials: M
authors.lastname: Ams
authors.forename: G
authors.initials: G
authors.lastname: Marshall
authors.forename: D
authors.initials: D
authors.lastname: Spence
authors.forename: M
authors.initials: M
authors.lastname: Withford