6 March 2013 Low-threshold, mirrorless emission at 981 nm in an Yb,Gd,Lu:KYW inverted rib waveguide laser
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In this work, we demonstrate 3-level laser operation in a Yb,Gd,Lu:KYW waveguide laser fabricated by combination of liquid phase epitaxy and Ar+ ion beam milling. Laser emission was observed at 981 nm with an absorbed threshold power of 23 mW and a slope efficiency of 58% without the use of any mirrors. With an HR/6%T cavity, the threshold was reduced to 13 mW. The output was single mode with beam radii of 4.8 μm and 3 μm in the in-plane and out-of-plane direction respectively. Laser emission was also observed at 999.8 nm with a threshold of 8 mW by using mirrors favouring the 999.8 nm transition and forming an HR/5%T cavity.
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Amol Choudhary, Western Bolaños, Pradeesh Kannan, Joan J. Carvajal, Magdalena Aguilò, Francesc Diaz, David P. Shepherd, "Low-threshold, mirrorless emission at 981 nm in an Yb,Gd,Lu:KYW inverted rib waveguide laser", Proc. SPIE 8599, Solid State Lasers XXII: Technology and Devices, 859905 (6 March 2013); doi: 10.1117/12.2001832; https://doi.org/10.1117/12.2001832


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