VIEIRA, TARCIO de A.PRADO, FELIPE M.WETTER, NIKLAUS U.2022-05-032022-05-032022VIEIRA, TARCIO de A.; PRADO, FELIPE M.; WETTER, NIKLAUS U. Nd:YLF laser at 1053 nm diode side pumped at 863 nm with a near quantum-defect slope efficiency. <b>Optics and Laser Technology</b>, v. 149, p. 1-5, 2022. DOI: <a href="https://dx.doi.org/10.1016/j.optlastec.2021.107818">10.1016/j.optlastec.2021.107818</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/33018.0030-3992http://repositorio.ipen.br/handle/123456789/33018Laser emission at the 1053 nm transition of Nd:YLF4 is demonstrated using diode-side-pumping at 863 nm directly into the emitting level. The laser configuration uses one total internal reflection at the pump face and provides the highest slope efficiency reported for the Nd:YLF4 medium, close to the quantum limit. In quasi-continuous mode, the laser operates with diffraction-limited beam quality and 78.2% slope efficiency with 14.4 W of output power. In continuous mode, 75.7% slope efficiency in both single-mode and multimode operation is achieved, with 13.5 W output power.1-5openAccesslasersneodymium laserslithium fluoridesyttrium fluoridescrystal dopingoptical pumpingArtigo de periódico14910.1016/j.optlastec.2021.1078180000-0002-9379-9530https://orcid.org/0000-0002-9379-953079.284