Spectral Narrowing in a Subwavelength Solid-StateLaser

The association of metallic nanostructures and solid-state gain media has recently led to the emergence of functional platforms for nanolasing with relevant features such as chemical and thermal stability and the absence of photobleaching. In this work, we demonstrate that the incorporation of plasmonic nanoparticle chains on a Nd3+-doped solid-state laser platform enables nanoscale laser emission at the technologically relevant spectral region of telecom (λe = 1385 nm), outside the spectral response of the plasmonic resonance of the nanoparticle chains. In addition, we experimentally show that the plasmonic chains improve the monochromaticity of the solid-state laser, thus, attaining spectral narrowing of the laser line by up to 38% depending on the pump wavelength. The effect of the plasmon driven absorption enhancement in the vicinities of the Ag nanoparticle chains is analyzed by tuning the optical pump in a broad spectral range (580–890 nm) at different Nd3+ transitions that overlap the spectral resp...