High-power diode-pumped Tm:YLF slab laser (original) (raw)

Demonstration of Diode-Pumped Yb:LaF3 and Tm,Ho:LaF3 Lasers

Applied Sciences, 2019

Diode-pumped solid-state lasers using novel Yb:LaF3 and Tm,Ho:LaF3 crystals as laser gain materials are demonstrated herein. The Yb:LaF3 and Tm,Ho:LaF3 crystals were grown using the Bridgman method. By matching their absorption bands, continuous-wave laser operations were achieved for the first time. The Yb:LaF3 laser obtained a maximum average output power of 1.19 W with dual wavelengths of 1028 nm and 1033 nm. The maximum average output power and slope efficiency of the Tm,Ho:LaF3 laser were 574 mW and 18.5%, respectively. The Tm,Ho:LaF3 laser exhibited two peaks at 2043 nm and 2048 nm. Both the Yb:LaF3 and Tm,Ho:LaF3 crystals were confirmed to be laser gain materials.

Compact, diode-side-pumped Nd^3+:YLiF_4 laser at 1053 nm with 45% efficiency and diffraction- limited quality by mode controlling

Optics Letters, 2009

We demonstrate what we believe to be the highest efficiency obtained to date in a transversely diodepumped Nd 3+ : YLiF 4 slab laser operating at 1053 nm. The compact 11-cm-long laser cavity configuration is based on total internal reflection of the intracavity beam at the pump facet of the gain crystal to improve the overlap with the pump radiation. Multimode operation with 9.5 W of output power and an efficiency of 45% is obtained for 21 W of pump power in a single-pass configuration. Using a second pass through the crystal and a new mode-controlling technique, the beam quality is improved to the diffraction limit with 6.9 W of output power and 33% of optical-to-optical efficiency.

Lasing in diode-pumped Tm:YAP, Tm,Ho:YAP and Tm,Ho:YLF

Optics Communications, 1998

A comparison of the room-temperature operation of continuous wave Tm:YAP, Tm,Ho:YAP and Tm,Ho:YLF lasers is reported. A conversion efficiency from absorbed pump power to laser output of 42% was demonstrated in Tm:YAP, compared to 14% in Tm,Ho:YAP and 30% in Tm,Ho:YLF. Tm:YAP was observed to operate multiline in the range 1.965 to 2.020 mm, whereas the holmium lasers operated on a single transition. The markedly different temporal behaviour of the single and double-doped crystals is analysed and discussed. q 1998 Elsevier Science B.V.

Efficient and compact diode-side-pumped Nd:YLF laser operating at 1053 nm with high beam quality

Journal of Optics A: Pure and Applied Optics, 2008

A very efficient, diode-side-pumped Nd:YLF laser is demonstrated using a compact cavity design based on total internal reflection inside the gain medium. With one pass through the crystal using a single bounce at the pumped face, efficiency in excess of 40% in multimode operation was measured, giving 6.6 W of output power for 16.2 W of pump power. Using two

Enhancement of Thulium-Ytterbium doped fiber laser efficiency using dual-pumping method

Microwave and Optical Technology Letters, 2014

Performance enhancement of laser acquired from a newly developed double-clad Yb 31 /Tm 31 codoped fiber (YTDF) is demonstrated using dual-pumping scheme. The laser uses a 2 m long YTDF fiber with a core dopant concentrations (in wt%) of 2.00 Yb 2 O 3 , 0.5 Tm 2 O 3 , 1.0 Al 2 O 3 , and 3.00 Y 2 O 3 as a gain medium in conjunction with a pair of fiber Bragg grating in a linear cavity resonator to generate lasing at 1901.6 nm. The best efficiency of 2.9% and the highest output power of 27 mW are obtained by combining 927 nm pump with 905 nm pump. As compared to a single pumping scheme using 927 nm pumping source, about 0.43% increment in efficiency is observed with no evidence of rollover at the highest output power. The best combination is to use 200 mW of 800 nm pump with 927 nm pump, wherein only a total pump power of 1900 mW is required to generate 20 mW of 1.9 lm laser output.

Compact diode‐side‐pumped Nd: YLF laser with high beam quality

2008

We describe the performance of a diode-side-pumped Nd:YLF laser using a compact cavity based on total internal reflection inside the gain media, showing the beam quality improvement with multiple pass configuration. With one pass through the crystal, high efficiency in multimode operation with 6W of output power for 17.1W of pump power is demonstrated. Using a second pass through the crystal, the beam quality was improved to fundamental mode with 3.8W of output power for 17.1W of pump power.

A power-scaling strategy for longitudinally diode-pumped Tm:YLF lasers

Applied Physics B-lasers and Optics, 2006

We describe a power-scaling strategy for longitudinally diode-pumped Tm:YLF lasers based on optimisation of the thulium doping level and the gain geometry. Carefully designed laser experiments at lower powers are shown to allow a simple means for accurately predicting the thermal loading and hence the power-scaling properties of this system, including the effects of ground-state depletion, cross relaxation and energy-transfer upconversion. An optimised doping level of 2 at. % and a slab geometry are shown experimentally to allow scaling of a single gain unit to output powers of ˜70 W, limited by the available pump power, and a strategy for scaling well beyond 100-W output is discussed.