[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Diode-Pumped Visible Laser Operation of Tb ³⁺ :LiLuF <sub/>4</sub>

摘要： Trivalent terbium-doped materials have been attracting the attention of the scientific community due to the capacity of Tb3+ to emit in the visible range. Efficient laser operation at green and yellow wavelengths has been demonstrated previously while laser operation in the orange and red ranges is not expected due to detrimental excited state absorption (ESA) processes [1-4]. Previous research on laser operation of Tb3+ doped materials was performed under pumping with frequency doubled optically pumped semiconductor laser (2ω-OPSL). These blue emitting pump sources exhibit an excellent beam quality at output powers up to 5 W, but they are complex, bulky, and expensive, and thus not well suited for power scaling. Diode-pumping presents a cost-efficient alternative with potential for power scaling and miniaturization. The availability of InGaN-based blue laser diodes makes it possible to match the peak absorption wavelength of the 7F6→5D4 transition of Tb3+ ions around 488 nm. Here, we present to the best of our knowledge, the first diode-pumped Tb3+ based laser. Under 200 mW of pump power at 488.3 nm, the laser operates in continuous wave (cw) at 542 or 544 nm with a maximum slope efficiency of 53% and up to 44 mW of output power.