High-efficiency, high-power and low threshold Yb^3+:YAG ceramic laser

Pirri, Angela; Alderighi, Daniele; Toci, Guido; Vannini, Matteo

doi:10.1364/oe.17.023344

Cited by 50 publications

(18 citation statements)

References 16 publications

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“…This is a reasonable approximation when in lasing condition, because it results both from rate equation models and from experimental measurements on several Yb-doped materials [28][29][30] that the fast deexcitation of the upper level due to the laser beam counteracts the saturation of the absorption at the pump wavelength. The resulting expression is…”

Section: Thermal Simulationsmentioning

confidence: 95%

“…Since their appearance on the scene, polycrystalline transparent materials of cubic structure doped [1][2][3][4] with rare earths as Nd 3+ [5][6][7] and Yb 3+ [8][9][10], are found to be appealing as laser gain materials showing all their potentiality in term of shortness of the pulse [11][12][13], average power level and beam quality. In consequence of that, in the past years many efforts have been made to improve and refine the techniques of fabrication paving the way to a new class of diode-pumped solid-state lasers.…”

Section: Introductionmentioning

confidence: 99%

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Laser Performance of 1% at. Yb : Lu2O3 Ceramic

Pirri

Toci

Vannini

2012

Advances in Optical Technologies

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We present the performance of a laser prototype based on 1% at. Yb : Lu 2 O 3 ceramic, longitudinally pumped in quasi-CW regime at 968 nm. A slope efficiency of 49% with respect to the absorbed pump power was obtained for laser operation at 1032.5 nm. We studied the effects on the laser oscillation due to the reinjection of the residual pump. The thermal behavior of the sample was investigated by means of numerical simulations, accounting for the different thermal load resulting from spontaneous and laser emission. Finally, we report the measured level of the Amplified Spontaneous Emission, which is found to be less than 0.1 mW.

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Section: Thermal Simulationsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Laser Performance of 1% at. Yb : Lu2O3 Ceramic

Pirri

Toci

Vannini

2012

Advances in Optical Technologies

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“…-doped optical quality YAG ceramics at ~1 μm are now routinely available with essentially the same laser efficiency as single crystals [3,4]. ~1.6 μm eye-safe wavelength regime lasers based on Er 3+ -doped gain media have many important applications in remote sensing, free space communications and as the pump source for generating 3-5 μm mid-infrared radiations via nonlinear frequency conversion.…”

Section: +mentioning

confidence: 99%

High Power Continuous-Wave and Graphene Q-switched Operation of Er:YAG Ceramic Lasers at ~1.6 ㎛

Wang

Chen

Shen

et al. 2013

Journal of the Optical Society of Korea

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We report on high-power continuous-wave operations of an Er:YAG ceramic laser in-band pumped by a cladding-pumped Er,Yb fiber laser at 1532 nm. With an output coupler of 10% transmission, the ceramic laser yielded 16.7 W of continuous-wave output at 1645 nm for 28.8 W of incident pump power, corresponding to a slope efficiency of 61.0% with respect to the incident pump power. The lasing wavelength switched to 1617 nm when output couplers of > 20% transmission were used. Up to 16.2 W of 1617 nm output was generated for 33.0 W of incident pump power, corresponding to a slope efficiency of 51.8%. Graphene Q-switched operation of Er:YAG cermic laser at 1645 nm was also demonstrated with stable pulses of 30-74 kHz repetition rates and 1.5-6.4 μs pulse widths.

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“…This approach allows the implementation of technical solutions which are unfeasible or very difficult to implement with the current crystal growth and fabrication technologies. The current level of development of transparent YAG ceramics gives them a laser performance fully comparable with their crystalline counterpart 2,3 . Ceramics also have specific advantages over single crystals that can be useful in developing certain applications.…”

Section: Introductionmentioning

confidence: 99%

Graded Yb:YAG ceramic structures: design, fabrication and characterization of the laser performances

et al. 2015

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Significant improvements in efficiency in high power, high repetition rate laser systems should come from the use of ceramic laser active elements suitably designed to mitigate the thermal and thermo-mechanical effects (TEs and TMEs) deriving from the laser pumping process. Laser active media exhibiting a controlled and gradual distribution of the active element(s) could therefore find useful applications in the laser-driven inertial confinement fusion systems, which are considered among the most promising energy source of the future (ultraintense laser pulses), and in medical applications (ultrashort laser pulses) The present work explores the flexibility of the ceramic process for the construction of YAG (Y 3 Al 5 O 12 ) ceramic laser elements with a controlled distribution of the Yb doping, in view of the realization of structures modelled to respond to specific application. Two processing techniques are presented to prepare layered structures with a tailored modulation of the doping level, with the goal of reducing the peak temperature, the temperature gradients and also the thermallyinduced deformation of the laser material, thus mitigating the overall thermal effects. Tape casting in combination with thermal compression of ceramic tapes with a varying doping level is one of the presented techniques. To make this process as more adaptable as possible, commercial micrometric ceramic powders have been used. The results are compared with those obtained using nanometric powders and a shaping process based on the subsequent pressing of spray dried powders with a different doping level. Laser performance has been characterized in a longitudinally diode pumped laser cavity. The laser efficiency under high thermal load conditions has been compared to those obtained from samples with uniform doping, and for samples obtained with press shaping and tape casting, under the same conditions.

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High-efficiency, high-power and low threshold Yb^3+:YAG ceramic laser

Cited by 50 publications

References 16 publications

Laser Performance of 1% at. Yb : Lu2O3 Ceramic

Laser Performance of 1% at. Yb : Lu2O3 Ceramic

High Power Continuous-Wave and Graphene Q-switched Operation of Er:YAG Ceramic Lasers at ~1.6 ㎛

Graded Yb:YAG ceramic structures: design, fabrication and characterization of the laser performances

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