Thulium doped monoclinic KLu(WO4)2 single crystals: growth and spectroscopy

Silvestre, Óscar F.; Pujol, María Cinta; Rico, Mauricio; Güell, Frank; Aguiló, Magdalena; Díaz, Francesc

doi:10.1007/s00340-007-2664-0

Cited by 77 publications

(62 citation statements)

References 38 publications

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“…27. Using the experimentally measured luminescence profiles and the radiative lifetime calculated by the Judd-Ofelt method, the emission cross sections were calculated in [33] also using the Füchtbauer-Ladenburg equation: for E//N p they were similar in magnitude to the results in Fig. 26 but for E//N m -roughly 2 times lower.…”

Section: Spectroscopy Of Yb-and Tm-doped Kluwmentioning

confidence: 92%

“…% Tm doping in the solution but the actual crystal composition, determined from electron microprobe analysis, was used to obtain the evolution of the unit cell parameters in Fig. 2 [30,33]. As could be expected, the monoclinic symmetry is maintained in all cases because KYbW and KTmW have the same structure as KLuW [1].…”

Section: Crystal Structure and Growth Of Bulk And Epitaxial Kluwmentioning

confidence: 99%

“…In particular, the larger splitting of the ground state is favourable because this leads to less thermal population of the lower level in quasi-four-level laser operation. Further spectroscopic information on the other transitions can be found in [33].…”

Section: Spectroscopy Of Yb-and Tm-doped Kluwmentioning

confidence: 99%

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Growth and properties of KLu(WO₄)₂, and novel ytterbium and thulium lasers based on this monoclinic crystalline host

Petrov¹,

Pujol

Mateos

et al. 2007

Laser & Photonics Reviews

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High-quality crystals of monoclinic KLu(WO4)2, shortly KLuW, were grown with sizes sufficient for its characterization and substantial progress was achieved in the field of spectroscopy and laser operation with Yb 3+ -and Tm 3+ -doping. We review the growth methodology for bulk KLuW and epitaxial layers, its structural, thermo-mechanical, and optical properties, the Yb 3+ and Tm 3+ spectroscopy, and present laser results obtained in several operational regimes both with Ti:sapphire and direct diode laser pumping using InGaAs and AlGaAs diodes near 980 and 800 nm, respectively. The slope efficiencies with respect to the absorbed pump power achieved with continuous-wave (CW) bulk and epitaxial Yb:KLuW lasers under Ti:sapphire laser pumping were ≈ 57 and ≈ 66%, respectively. Output powers as high as 3.28 W were obtained with diode pumping in a simple two-mirror cavity where the slope efficiency with respect to the incident pump power reached ≈ 78%. Passively Q-switched laser operation of bulk Yb:KLuW was realized with a Cr:YAG saturable absorber resulting in oscillation at ≈ 1031 nm with a repetition rate of 28 kHz and simultaneous Raman conversion to ≈ 1138 nm with maximum energies of 32.4 and 14.4 µJ, respectively. The corresponding pulse durations were 1.41 and 0.71 ns. Passive mode-locking by a semiconductor saturable absorber mirror (SESAM) produced bandwidth-limited pulses with duration of 81 fs (1046 nm, 95 MHz) and 114 fs (1030 nm, 101 MHz) for bulk and epitaxial Projection of the KLu(WO4)2 structure parallel to the b crystallographic direction [010].Yb:KLuW lasers, respectively. Slope efficiency as high as 69% with respect to the absorbed power and an output power of 4 W at 1950 nm were achieved with a diodepumped Tm:KLuW laser. The slope efficiency reached with an epitaxial Tm:KLuW laser under Ti:sapphire laser pumping was 64 %. The tunability achieved with bulk and epitaxial Tm:KLuW lasers extended from 1800 to 1987 nm and from 1894 to 2039 nm, respectively.

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Section: Spectroscopy Of Yb-and Tm-doped Kluwmentioning

confidence: 92%

Section: Crystal Structure and Growth Of Bulk And Epitaxial Kluwmentioning

confidence: 99%

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Growth and properties of KLu(WO₄)₂, and novel ytterbium and thulium lasers based on this monoclinic crystalline host

Petrov¹,

Pujol

Mateos

et al. 2007

Laser & Photonics Reviews

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246

205

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“…2(a). The emission wavelength corresponds to a local maximum in the gain spectrum of Tm:KLuW for low inversion ratios, β < 0.2 [5]. Q-switching instabilities for P abs >3.3 W are partially attributed to heating of the graphene SA due to residual (non-absorbed) pump.…”

Section: Resultsmentioning

confidence: 97%

“…This means high Tm content and efficient CR maintaining an excellent crystal quality. In addition, Tm:DTs offer intense and wide absorption and stimulatedemission bands with a strong polarization-anisotropy [3][4][5]. Due to the CR processes, the heat loading in Tm:DTs is relatively low [6].…”

Section: Introductionmentioning

confidence: 99%

Tm:KLu(WO_4)_2 microchip laser Q-switched by a graphene-based saturable absorber

et al. 2015

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Abstract:We report on the first Tm-doped double tungstate microchip laser Q-switched with graphene using a Tm:KLu(WO 4 ) 2 crystal cut along the N g dielectric axis. This laser generates a maximum average output power of 310 mW with a slope efficiency of 13%. At a repetition rate of 190 kHz the shortest pulses with 285 ns duration and 1.6 µJ energy are achieved. ©2015 Optical Society of America

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Polarization switching in the 2-µm Tm:KLu(WO4)2 laser

et al. 2011

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We report on polarization switching in the Tm:KLu(WO4)2 laser between the Nm and Np states oscillating at different wavelengths: 1946 nm for N m and 1922 nm for N p . There is a certain power range where the two laser polarizations coexist in this biaxial crystal. The switching strongly depends on the thermal management of the active medium through either the mode matching between the pump and the laser beams or the cooling of the crystal faces. Intensity, arb. units Wavelength, nm P inc = 11.0 W P inc = 12.0 W P inc = 18.0 W

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Thulium doped monoclinic KLu(WO4)2 single crystals: growth and spectroscopy

Cited by 77 publications

References 38 publications

Growth and properties of KLu(WO₄)₂, and novel ytterbium and thulium lasers based on this monoclinic crystalline host

Growth and properties of KLu(WO₄)₂, and novel ytterbium and thulium lasers based on this monoclinic crystalline host

Tm:KLu(WO_4)_2 microchip laser Q-switched by a graphene-based saturable absorber

Polarization switching in the 2-µm Tm:KLu(WO4)2 laser

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Thulium doped monoclinic KLu(WO4)2 single crystals: growth and spectroscopy

Cited by 77 publications

References 38 publications

Growth and properties of KLu(WO4)2, and novel ytterbium and thulium lasers based on this monoclinic crystalline host

Growth and properties of KLu(WO4)2, and novel ytterbium and thulium lasers based on this monoclinic crystalline host

Tm:KLu(WO_4)_2 microchip laser Q-switched by a graphene-based saturable absorber

Polarization switching in the 2-µm Tm:KLu(WO4)2 laser

Contact Info

Product

Resources

About

Growth and properties of KLu(WO₄)₂, and novel ytterbium and thulium lasers based on this monoclinic crystalline host

Growth and properties of KLu(WO₄)₂, and novel ytterbium and thulium lasers based on this monoclinic crystalline host