Continuous wave laser operation of Yb3+:YVO4

Kränkel, Christian; Fagundes-Peters, D.; Fredrich, S.T.; Johannsen, J.; Mond, M.; Huber, G.; Bernhagen, M.; Uecker, R.

doi:10.1007/s00340-004-1635-y

Cited by 118 publications

(49 citation statements)

References 11 publications

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“…Some of these materials such as Yb:LuVO and Yb:YVO have been used in a CW thin disk laser but the output power has not exceeded 15 W [55]. Despite their comparably high thermal conductivity [78] both materials suffer from a very small splitting of the lower Stark level, which makes the laser performance very sensitive to thermal issues. Therefore, these crystals appear not well-suited for the generation of femtosecond pulses in high-power thin disk lasers.…”

Section: Yb:vanadatesmentioning

confidence: 99%

High-power ultrafast thin disk laser oscillators and their potential for sub-100-femtosecond pulse generation

et al. 2009

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Ultrafast thin disk laser oscillators achieve the highest average output powers and pulse energies of any mode-locked laser oscillator technology. The thin disk concept avoids thermal problems occurring in conventional high-power rod or slab lasers and enables high-power TEM 00 operation with broadband gain materials. Stable and self-starting passive pulse formation is achieved with semiconductor saturable absorber mirrors (SESAMs). The key components of ultrafast thin disk lasers, such as gain material, SESAM, and dispersive cavity mirrors, are all used in reflection. This is an advantage for the generation of ultrashort pulses with excellent temporal, spectral, and spatial properties because the pulses are not affected by large nonlinearities in the oscillator. Output powers close to 100 W and pulse energies above 10 µJ are directly obtained without any additional amplification, which makes these lasers interesting for a growing number of industrial and scientific applications such as material processing or driving experiments in high-field science. Ultrafast thin disk lasers are based on a power-scalable concept, and substantially higher power levels appear feasible. However, both the highest power levels and pulse energies are currently only achieved with Yb:YAG as the gain material, which limits the gain bandwidth and therefore the achievable pulse duration to 700 to 800 fs in It is important to evaluate their suitability for power scaling in the thin disk laser geometry. In this paper, we review the development of ultrafast thin disk lasers with shorter pulse durations. We discuss the requirements on the gain materials and compare different Yb-doped host materials. The recently developed sesquioxide materials are particularly promising as they enabled the highest optical-tooptical efficiency (43%) and shortest pulse duration (227 fs) ever achieved with a mode-locked thin disk laser.

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Section: Yb:vanadatesmentioning

confidence: 99%

High-power ultrafast thin disk laser oscillators and their potential for sub-100-femtosecond pulse generation

et al. 2009

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“…A second issue that 3 deserves to be addressed is the influence of deviatoric stresses on the HP structural sequence; these stresses have been shown to considerably influence the HP structural behavior of the isomorphic HoVO 4 and CeVO 4 [14,28]. Other facts that should be explored in detail are the possible decomposition or amorphization of EuVO 4 .…”

Section: Introductionmentioning

confidence: 99%

High-pressure powder x-ray diffraction study of EuVO4

Garg

Errandonea

2015

Journal of Solid State Chemistry

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Abstract:The high-pressure structural behavior of europium orthovanadate has been studied using in-situ, synchrotron based, high-pressure x-ray powder diffraction technique. Angle-dispersive x-ray diffraction measurements were carried out at room temperature up to 34.7 GPa using a diamond-anvil cell, extending the pressure range reported in previous experiments. We confirmed the occurrence of zircon-scheelite phase transition at 6.8 GPa and the coexistence of low-and high-pressure phases up to 10.1GPa. In addition, clear evidence of a scheelite-fregusonite transition is found at 23.4 GPa.

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“…Such laser materials are characterized by relatively good thermomechanical properties in combination with large absorption and stimulated emission cross sections for the optical transitions in the rare-earth ions. Recently, efficient continuous-wave (cw) laser operation has been demonstrated in a new Yb-doped crystal: Yb 3+ : YVO 4 ͑Yb: YVO 4 ͒ when pumped with either a Ti:sapphire laser 2 or a diode laser. 3 From the point of view of the development of new Yb-doped crystals for reliable and efficient femtosecond lasers, materials are preferred that possess high cross sections (in particular, the emission cross section) 4 together with broad gain spectra [5][6][7] and good physical and mechanical properties.…”

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Yb^3+-doped YVO_4 crystal for efficient Kerr-lens mode locking in solid-state lasers

et al. 2005

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We report the first demonstration, to our knowledge, of soft-aperture Kerr-lens mode locking in a diodepumped femtosecond Yb 3+ : YVO 4 laser. Near-transform-limited pulses as short as 61 fs are generated around a center wavelength of 1050 nm with an output power of 54 mW and a pulse repetition frequency of 104.5 MHz. This is, to our knowledge, the shortest pulse generated directly from an Yb laser having a crystalline host material. The femtosecond operation has a mode-locking threshold at an absorbed pump power of 190 mW. 3 From the point of view of the development of new Yb-doped crystals for reliable and efficient femtosecond lasers, materials are preferred that possess high cross sections (in particular, the emission cross section) 4 together with broad gain spectra 5-7 and good physical and mechanical properties. 8 In this context, given the strong and broad absorption peak (FWHM of ϳ8 nm) at around 985 nm, which is compatible with optical pumping by well-developed InGaAs laser diodes, the extremely low quantum defect ͑ϳ3.5% ͒, and a relatively broad and smooth 5 (glasslike) emission spectrum, the Yb: YVO 4 crystal is a good candidate gain medium for incorporation into diode-pumped femtosecond lasers for the 1-m spectral region. Indeed, 120-fs pulses with an average power of 300 mW were generated from a diode-pumped Yb: YVO 4 laser that was passively mode locked by using a semiconductor saturable absorber mirror (SESAM). 9In fact, most of the work in the field of ultrashort Yb lasers has concentrated on the employment of SESAMs 10 for passive mode locking. Kerr-lens mode locking 11 (KLM) is another well-developed technique for the generation of ultrashort pulses from lasers that are efficient, compact, and have reduced cavity component counts. 12 Reducing the intracavity losses by excluding a SESAM (nonsaturable losses) can lead to a substantial enhancement in the optical efficiency of such a femtosecond laser. In addition, the shortest pulse generated directly from a laser was produced using the KLM technique. 13 One of the critical parameters for reliable Kerr-lens mode locking is a high value of the nonlinear refractive index n 2 of a laser medium. Although, Major et al. have shown that a number of Yb-doped crystals are characterized by relatively high n 2 and are promising for KLM operation, 14,15 only the Yb:KYW laser has been mode locked successfully by using the optical Kerr effect under the conditions of direct diode pumping. 16,17 In this Letter we describe the parameters of a new Yb-doped YVO 4 crystal, which was selected for possible exploitation in KLM solid-state lasers. Impressively, our KLM Yb: YVO 4 laser produced pulses as short as 61 fs at a center wavelength of 1050 nm with an average output power of 54 mW for an absorbed pump power of just 400 mW. The nonlinear refractive indices were measured for the Yb: YVO 4 crystal by using the z-scan technique and were found to be 19 ϫ 10 −16 cm 2 / W and 15ϫ 10 −16 cm 2 / W for and polarizations, respectively, at 1080 nm.A schematic of the laser c...

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Continuous wave laser operation of Yb3+:YVO4

Cited by 118 publications

References 11 publications

High-power ultrafast thin disk laser oscillators and their potential for sub-100-femtosecond pulse generation

High-power ultrafast thin disk laser oscillators and their potential for sub-100-femtosecond pulse generation

High-pressure powder x-ray diffraction study of EuVO4

Yb^3+-doped YVO_4 crystal for efficient Kerr-lens mode locking in solid-state lasers

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