Resonantly pumped tunable Ho:YAG laser

Kwiatkowski, Jacek; Jabczyński, Jan Karol; Gorajek, Lukasz; Żendzian, Waldemar; Jelı́nková, Helena; Šulc, Jan; Němec, Michal; Koranda, Petr

doi:10.1002/lapl.200910031

Cited by 45 publications

(16 citation statements)

References 20 publications

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“…It is well known that bulk Ho:YAG has a relative broad emission band from 2050 -2150 nm, and previous papers confirm the wavelength tuning capability of Ho:YAG solid state lasers [23]. Ho:YAG SCF shows the same broadband emission in this wavelength region, therefore it would be valuable to measure the gain at different wavelengths across this spectral band.…”

Section: Small Signal Gain Measurement and Discussionmentioning

confidence: 76%

Ho:YAG single crystal fiber: fabrication and optical characterization

Li¹,

Johnson²,

Nie³

et al. 2014

Opt. Express

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0.5% Holmium (Ho) doped YAG single crystal fiber (SCF) was fabricated using Laser Heated Pedestal Growth (LHPG) method and characterized for its optical absorption and emission properties involving transitions between the 5I8 and 5I7 energy levels. The results verified the absorption peaks suitable for in-band direct pumping at 1908 nm and 1932 nm with the emission occurring between 2050 and 2150 nm. Small signal gain measurements were also performed for demonstrating the fiber like characteristics of the SCF.

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Section: Small Signal Gain Measurement and Discussionmentioning

confidence: 76%

Ho:YAG single crystal fiber: fabrication and optical characterization

Li¹,

Johnson²,

Nie³

et al. 2014

Opt. Express

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“…Direct excitation using resonant or in-band pumping of the 5 I 7 excited level of Ho at $1:9 m offers the advantages of high quantum efficiency for the $2:1 m laser transition and minimal heat load to the active element, both important prerequisites for power scaling in this spectral range. The resonant pumping of Ho lasers by separate Tm lasers in continuous-wave (CW) or Q-switched regimes has been extensively studied, including several Tm crystal [2][3][4][5][6] and fiber [7][8][9][10] lasers. However, these Tm lasers, being diodepumped near 800 nm, lead to a low overall efficiency of such cascaded pump schemes.…”

mentioning

confidence: 99%

Diode-Pumped Ho-Doped KLu(WO₄)₂Laser at 2.08 µm

Jambunathan

Mateos

Pujol

et al. 2011

Appl. Phys. Express

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We report on the efficient continuous-wave diode-pumped laser operation of Ho in the monoclinic KLu(WO 4 ) 2 crystal at 2080 nm, resonantly pumped at a wavelength of 1941 nm by a fiber-coupled GaSb diode stack. A maximum output power of 408 mW and a slope efficiency of 54.5% with respect to the absorbed pump power were achieved. A comparison of the laser performance within the Ho-doped KRE(WO 4 ) 2 (Ho:KRE(WO 4 ) 2 ) family of monoclinic crystals showed a slightly superior performance of Ho:KY(WO 4 ) 2 , achieving a maximum output power of 438 mW and a slope efficiency of 58.8% under identical conditions. #

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“…9 ) operating at 1.6 μm wavelength pumped at ~ 1.5 μm and Ho lasers resonantly pumped at 1.9 μm (see e.g. [9][10][11][12]. In a case of indirect excitation, the absorption / pumping band is significantly shifted to shorter wavelengths and several processes of energy transfer (crossrelaxation, migration) have to be exploited to efficiently populate the upper laser level.…”

Section: Introductionmentioning

confidence: 99%

The new optimization method of Q-switched quasi-three-level lasers

et al. 2011

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The aim of work is to develop efficient theoretical model enabling analysis and optimization of Q-switched quasi-threelevel lasers. The model consists of two parts: pumping part and Q-switched part, which can be separated in a case of active Q-switching regime. For the pumping of quasi-three-level gain medium the semi-analytical model was developed, enabling the calculations for average occupation of upper laser level for given pump power and pump duration, spatial pump beam profile, length and dopant level of gain medium. Moreover, ground-state-depletion, up-conversion parasitic relaxation and temperature effects were considered in the model. The new approach for optimization of CW regime of quasi-three-level lasers was developed for Q-switched lasers operating with high repetition rates. Moreover, for long pump durations comparable to laser upper level lifetimes, the optimization procedure based on Lagrange multiplier technique was developed. The simple analytical formulae for effective pump duration needed to achieve the quasistationary inversion for given pump power density and up-conversion parameter were derived. The model enables the optimization of gain medium length and absorbance, average pump area and out-coupling losses for wide class of quasithree-level lasers.

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Resonantly pumped tunable Ho:YAG laser

Cited by 45 publications

References 20 publications

Ho:YAG single crystal fiber: fabrication and optical characterization

Ho:YAG single crystal fiber: fabrication and optical characterization

Diode-Pumped Ho-Doped KLu(WO₄)₂Laser at 2.08 µm

The new optimization method of Q-switched quasi-three-level lasers

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Resonantly pumped tunable Ho:YAG laser

Cited by 45 publications

References 20 publications

Ho:YAG single crystal fiber: fabrication and optical characterization

Ho:YAG single crystal fiber: fabrication and optical characterization

Diode-Pumped Ho-Doped KLu(WO4)2Laser at 2.08 µm

The new optimization method of Q-switched quasi-three-level lasers

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Diode-Pumped Ho-Doped KLu(WO₄)₂Laser at 2.08 µm