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  • 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 2019),
  • paper ca_3_3

Femtosecond-Laser-Written Waveguide Lasers at ~2 μm

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Abstract

In this work, we review our recent results on fabrication, optical characterization and continuous-wave and passively Q-switched 2-μm laser operation of active waveguides (WGs) produced by femtosecond direct laser writing (fs-DLW) in thulium and holmium doped low-symmetry (monoclinic) crystals. Fs-DLW was performed by 120-fs / 1-kHz pulses at 795 nm [1]. Various depressed-index photonic micro-structures were fabricated, Fig. 1, such as buried channel WGs with circular and hexagonal (lattice-like) cladding, surface WGs with a half-ring cladding, and straight WGs and Y-branch splitters with a rectangular cross-section. The WG core size was in the range 40–100 μm, comprising both fundamental- and multi-mode WGs.

© 2019 IEEE

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