High power 2.3 μm Yb:Tm:YLF laser, simultaneously diode-pumped at 685 nm and 960 nm

Matos, Paulo Sergio Fabris de; Wetter, Niklaus Ursus

doi:10.1364/assp.2006.tub5

Cited by 3 publications

(5 citation statements)

References 7 publications

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“…1 in [61]). A Yb-Tm energy transfer process rise-time of around 800 µs was reported in [61], that is slightly shorter than our measurement (1.2 ms). On the other hand, while analyzing the influence of rare earth impurities in refrigeration efficiency in Yb:YLF, Di Lieto et al proposed another path [17], the energy transfer from the Yb +3 ions to Tm +3 is probably not direct, and occurs via the Er +3 impurity (energy transfers first from Yb to Er and then from Er to Tm, see Fig.…”

Section: Timing Dynamics Of Different Colours Of Upconversion Spectrummentioning

confidence: 99%

“…Emission in the blue region (450-500 nm) is believed to originate from the 1 G4 to 3 H6 transition of the Tm +3 ion [58,59]. Matos et al explains several possible pathways of energy transfer from the Yb ion to the Tm ion [61], including energy-transfer upconversion, cross relaxation and even a back transfer process (see Fig. 1 in [61]).…”

Section: Timing Dynamics Of Different Colours Of Upconversion Spectrummentioning

confidence: 99%

“…Matos et al explains several possible pathways of energy transfer from the Yb ion to the Tm ion [61], including energy-transfer upconversion, cross relaxation and even a back transfer process (see Fig. 1 in [61]). A Yb-Tm energy transfer process rise-time of around 800 µs was reported in [61], that is slightly shorter than our measurement (1.2 ms).…”

Section: Timing Dynamics Of Different Colours Of Upconversion Spectrummentioning

confidence: 99%

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Temperature and doping dependence of fluorescence lifetime in Yb:YLF (role of impurities)

et al. 2021

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We have investigated temperature and doping dependence of fluorescence lifetime in Yb:YLF crystals in the 78-300 K range, for samples with Yb-doping levels of 0.5%, 1 % and 25%. Radiation-trapping prolonged fluorescence lifetimes are first measured to understand the pros and cons of this inevitable process on fractional thermal load and laser gain. Later, pinhole method was used to acquire ideally trapping free fluoresce lifetimes. For the lowly Yb-doped samples, fluorescence lifetime was measured to be 1.97 ms and 2.1 ms at 78 K and 300 K, respectively. For the 25% Yb-doped sample, strong upconversion emission due to the presence of Er, Tm and Ho impurities were observed. A doubleexponential decay behavior, combined with excitation intensity dependent decay profile was also revealed for this highly doped sample. Even with the pinhole method, the 300 K fluorescence lifetimes was measured as 4.5 ms, showing the difficulty to acquire radiation-trapping free signals at high doping levels. Time dynamics of upconverted emission in different spectral regions were also recorded, which provides hints on the energy transfer mechanisms between the Yb ion and the other rare-earth impurities.

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Section: Timing Dynamics Of Different Colours Of Upconversion Spectrummentioning

confidence: 99%

Section: Timing Dynamics Of Different Colours Of Upconversion Spectrummentioning

confidence: 99%

Section: Timing Dynamics Of Different Colours Of Upconversion Spectrummentioning

confidence: 99%

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Temperature and doping dependence of fluorescence lifetime in Yb:YLF (role of impurities)

et al. 2021

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“…In their early work, Stoneman et al used a Ti:Sapphire laser operating at 681 nm to pump a Tm:YAG crystal, but the obtained slope efficiency was only around 35%, indicating a weak cross-relaxation process [30]. Matos et al pumped a 9.5%-Yb-and 1.15% Tm-doped Yb:Tm:YLF crystal simultaneously with 685 nm and 980 nm diodes, and obtained a slope efficiency of 10% only [33]. Due to the inefficient side-pumping geometry, lasing could not be achieved while pumping the system only with the 5W 685-nm multimode diode laser [33].…”

Section: Introductionmentioning

confidence: 99%

“…Matos et al pumped a 9.5%-Yb-and 1.15% Tm-doped Yb:Tm:YLF crystal simultaneously with 685 nm and 980 nm diodes, and obtained a slope efficiency of 10% only [33]. Due to the inefficient side-pumping geometry, lasing could not be achieved while pumping the system only with the 5W 685-nm multimode diode laser [33].…”

Section: Introductionmentioning

confidence: 99%

Efficient Tm:YAG and Tm:LuAG lasers pumped by 681 nm tapered diodes

et al. 2019

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In this paper, we present highly-efficient continuous-wave (cw) laser operation of Tm:YAG and Tm:LuAG lasers pumped by high-brightness red tapered diodes. The single-emitter tapered diode lasers (TDLs) provide up to 1-W of pump power around 680 nm. By adjusting the operation temperature of the TDL, the pump central wavelength could be matched to the strong absorption peak of Tm 3+ ions in this region ( 3 H6→ 3 F3 excitation). This absorption peak is around 3-fold stronger than the usually employed 785 nm transition ( 3 H6→ 3 H4) . In the cw laser experiments, we have achieved slope efficiencies exceeding 55% at room temperature, which is far above the stokes limited slope efficiency (34%), indicating presence of strong two-for-one cross-relaxation process. Pumping with high-brightness tapered diode lasers further facilitated usage of smaller pump spots (enabling quite low lasing thresholds) and generation of near-diffraction limited output beam profiles from standard z-type cavities. To the best of our knowledge, this is the first report of diode pumping of Tm-doped solid-state lasers around 680 nm, as well as the first usage of TDLs as pump sources in Tm-doped laser systems.

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"Investigação de Lasers de fluoreto dopados com Túlio e bombeados por diodo-Laser"

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High power 2.3 μm Yb:Tm:YLF laser, simultaneously diode-pumped at 685 nm and 960 nm

Cited by 3 publications

References 7 publications

Temperature and doping dependence of fluorescence lifetime in Yb:YLF (role of impurities)

Temperature and doping dependence of fluorescence lifetime in Yb:YLF (role of impurities)

Efficient Tm:YAG and Tm:LuAG lasers pumped by 681 nm tapered diodes

"Investigação de Lasers de fluoreto dopados com Túlio e bombeados por diodo-Laser"

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