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, Amol Choudhary, Western Bolaños, Western Bolaños, Pradeesh Kannan, Pradeesh Kannan, Joan J. Carvajal, Joan J. Carvajal, Magdalena Aguilò, Magdalena Aguilò, Francesc Diaz, Francesc Diaz, David P. Shepherd, 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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