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  • Title: Femtosecond laser direct writing of few-mode depressed-cladding waveguide lasers.
    Author: Jia Y, He R, Vázquez de Aldana JR, Liu H, Chen F.
    Journal: Opt Express; 2019 Oct 14; 27(21):30941-30951. PubMed ID: 31684335.
    Abstract:
    We report on mirrorless laser operation of Nd:YVO4 single- and double-cladding waveguides fabricated by femtosecond laser direct writing. Fundamental- (LP01) and high-order-mode (LP03, LP05) guiding and lasing have been observed in waveguides with different geometries and sizes. Double-cladding waveguides exhibit good guiding and lasing performance via inheriting advantages respectively from individual single cladding. As a result, continuous-wave lasing with a threshold as low as 59 mW is obtained, depending on the optical feedback provided only by Fresnel reflections at the waveguide end faces. By using few-layer graphene as saturable absorber, passively Q-switched operation in fabricated waveguides is also achieved.
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