Optical Fibers for Industrial Laser Applications

Efficient 805 nm diode-pumped continuous-wave 1.9 µm Tm3+ : NaLa(MoO4)2laser

“…This shows that an efficient 805 nm diode-pumped 1.9 µm CW laser operation can be realized in the Tm 3+ : NLM crystal. At present, the slope efficiency of the Tm 3+ -doped crystalline laser is lower than that (70%) of the Tm 3+ -doped fibre laser [20][21][22]. However, a compact Tm 3+ -doped crystalline laser with smaller dimensions may be more favourable for applications in some harsh environments, such as military and outdoors.…”

High power widely tunable Tm:fiber laser with spectral linewidth of 10 pm

“…Cladding-pumped Tm:fiber laser sources operating in the eye-safe 2 µm spectral region have attracted growing interest in recent years owing to their numerous applications in areas such as atmospheric monitoring, range finding and medicine. Fibre-based sources benefit from a geometry that allows simple thermal management and hence offer the potential for scaling to very high power levels while maintaining good beam quality [1]. Additional advantages of Tm-doped fiber systems include their compatibility with high-power GaAlAs diode-bar pumping around 0.8 µm, the fortuitous "two-for-one" cross-relaxation process that can lead to pumping quantum efficiencies approaching two for high Tm dopant concentrations [2,3], and broad emis-sion spectra of more than 300 nm, which allows for considerable flexibility in wavelength tuning.…”