Efficient Resonantly-Pumped Tm:Y2O3 Ceramic Laser

Wang, Kai; Cai, Jianfei; Ding, Yu; Wang, Zhao

doi:10.1007/s10946-022-10047-0

Cited by 1 publication

(1 citation statement)

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“…Overall the Tm:YAG laser efficiency under resonant pumping appears to correspond to other published experiments. 21,45 The output parameter improvement was achieved due to carefully adjusting the crystal axial position and the pump diode temperature at given incident power levels, and also by cooling the ambient temperature to cca. 18 • C, which was especially important at the higher power levels to stabilize the pump diode wavelength.…”

Section: High-efficiency Resonantly-pumped Tm-doped Lasersmentioning

confidence: 99%

Efficient resonant diode pumping of 2 µm thulium lasers at 1.7 µm

Kratochvíl,

Šulc,

Nemec

et al. 2024

Solid State Lasers XXXIII: Technology and Devices

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Tm 3+ -doped media are actively researched due to the 2 µm laser transition 3 F 4 → 3 H 6 of Tm 3+ ion. A diode pumping of the 3 H 4 manifold has become a standard excitation method, utilizing the availability of 0.8 µm GaAlAs-based diodes and efficient cross-relaxation energy transfer. An essential drawback of this scheme results from a strong inter-ionic distance dependence of the cross-relaxation, which therefore requires sufficient Tm 3+ doping to achieve the desired quantum efficiency. This can in turn result in an increased probability of up-conversion losses, clustering of Tm 3+ ions, increased generated heat, more difficulties with material growth, and less favorable thermal properties. In this proceeding, we aim to bring attention to the resonant diode pumping of the 3 F 4 manifold in the 1.6-1.8 µm region and its feasibility. This excitation scheme has a low quantum defect, it circumvents the cross-relaxation requirements, and it is supported by broad absorption peaks. The commercial availability and output power of such diodes is already adequate for a solid-state laser pump source. To illustrate the feasibility, we summarize and expand our results with lasers based on Tm:YAG, Tm:YAP, Tm:YLF, Tm:GGAG and Tm, Ho:GGAG. Crystals were pumped using a 25 W fiber-coupled 1:1 focused diode laser (core diam. = 400 µm, waist diam. = 376 µm, NA = 0.22, M 2 = 52) emitting in the 1.68-1.71 µm region. Despite the relatively low spatial and spectral quality of the used 1.7 µm diode emission, favorable results were obtained, such as an efficiency of 80% with respect to absorbed power, multi-watt output power in CW regime, or efficient operation of low-concentration crystals.

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Section: High-efficiency Resonantly-pumped Tm-doped Lasersmentioning

confidence: 99%