A modified model for the LD pumped 2μm Tm:YAG laser: Thermal behavior and laser performance

Li, Xuan; Huang, H. K.; Zhu, Heyuan; Wang, Yong; Wang, Li; Shen, Deyuan; Zhang, Jian; Tang, Dewei

doi:10.1016/j.optcom.2014.07.037

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…For example, the absorption, emission cross-section and thermal conductivity of Tm:YAG can be changed with changing temperature, which seriously affects the characteristics of the output laser [12,13]. Therefore, for further power scaling, detailed research on Tm:YAG lasers is required [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the thermal effects in diode-pumped Tm:YAG ceramic slab lasers

2017

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Tm:YAG ceramics with a quasi-three-level system are sensitive to temperature. The optical and thermodynamic properties of Tm:YAG ceramics can change with changing temperature, and this affects the output power stability and beam quality of lasers. Thus temperature control is a key and difficult problem for Tm:YAG lasers, especially for high power laser output. In combination with slab structure and grad-doping techniques for composite ceramics, the temperature distributions of Tm:YAG ceramics are analyzed. It is found that the temperature difference of a rationally designed grad-doping Tm:YAG ceramic can be reduced significantly with the same absorption pump power, which results in higher output power and beam quality.

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Section: Introductionmentioning

confidence: 99%

Analysis of the thermal effects in diode-pumped Tm:YAG ceramic slab lasers

2017

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“…A lot of work has been focused on thulium-doped crystals, such as Tm:YAG, Tm:YLF, Tm:YAP, and Tm:LiLuF 4 , by previous researchers [4][5][6][7][8]. Recently, thulium-doped polycrystalline ceramics has been considered as a promising laser material to build high-efficiency and high-average-power diode-pumped all-solid-state lasers [9][10][11]. Compared to single crystals, laser ceramics permit higher doping concentrations with more uniform distribution, while the optical properties are preserved.…”

Section: Introductionmentioning

confidence: 99%

Power scaling of Tm:YAG slab ceramic laser

et al. 2015

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We describe the high power operation of transparent Tm:YAG ceramic lasers end-pumped by a 80 W laser-diode bar at 782 nm. The optimization of the Tm 3+ -ion doping concentration and the laser configuration for high power Tm:YAG ceramic lasers are investigated. We obtain the continuous wave (CW) output power of 24.6 W with the slope efficiency of 38.2% from a 6 at.% Tm:YAG ceramic slab laser. This is, to the best of our knowledge, the highest output average-power of diode-bar end-pumped Tm:YAG ceramic lasers ever reported.

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“…Parameters used in the simulation are listed in Table 2. [19] Convective heat transfer coefficient (K heat ) 10 W/(m 2 •K) [20] Radiative quantum efficiency of 3 F 4 state (η 3F4 R ) 0.98 [21] Temperature of coolant fluid (T cool ) 292 K…”

mentioning

confidence: 99%

Up conversion and excited state absorption analysis in the Tm:YAG disk laser multi-pass pumped by 1 μm laser

Song

Zhu

Wang

et al. 2021

High Pow Laser Sci Eng

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We present a 2 μm Tm:YAG disk laser multi-pass pumped by a 1 μm laser. The transitions in competition of up conversion (UC) and excited state absorption (ESA) are analyzed in detail based on a numerical model that considers stimulated emission, fluorescence, non-radiative decay, UC, andESA, showing good agreement with experiments. The proportions and fractional thermal loads of all transitions are derived quantitatively. The results show that UC and ESA are critical in Tm:YAG disk lasers, resulting in a decrease in the absorbed pump power and temperature after lasing for two different disk thicknesses. In addition, although the absorbed pump power of the 0.5 mm disk is lower than in the 1 mm case, its relatively weak UC and ESA and low total fractional thermal load can improve laser performance. A 0.5 mm Tm:YAG disk laser thus delivered the maximum output power of1.05 W with beam quality of Mx2 = 2.02 and My2 = 2.03.

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A modified model for the LD pumped 2μm Tm:YAG laser: Thermal behavior and laser performance

Cited by 7 publications

References 27 publications

Analysis of the thermal effects in diode-pumped Tm:YAG ceramic slab lasers

Analysis of the thermal effects in diode-pumped Tm:YAG ceramic slab lasers

Power scaling of Tm:YAG slab ceramic laser

Up conversion and excited state absorption analysis in the Tm:YAG disk laser multi-pass pumped by 1 μm laser

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