Thermal lensing in diode-pumped ytterbium Lasers-Part I: theoretical analysis and wavefront measurements

Chénais, Sébastien; Balembois, François; Druon, Frédéric; Lucas-Leclin, Gaëlle; Georges, Patrick

doi:10.1109/jqe.2004.833198

Cited by 116 publications

(81 citation statements)

References 54 publications

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“…Our group reported recently [73] a derivation of Armstrong's work to measure thermal lensing in various diode-pumped Yb:doped crystals, under lasing or nonlasing conditions. The setup appears in figure 30.…”

Section: Iv43 Methods Based On Shack-hartmann Wavefront Sensingmentioning

confidence: 99%

“…For a qualitative discussion of fracture issues in Yb-doped materials, the reader is invited to refer to a previous publication [73].…”

Section: Iii2 Stress and Strain Calculationsmentioning

confidence: 99%

“…Most of the examples are taken from our previous publications [73,121]: the reader interested in the technical details of the experiments, as well as by the theoretical considerations underneath, is invited to refer to these works.…”

Section: Thermal Lensing Measurements In Ytterbium-doped Materialsmentioning

confidence: 99%

See 2 more Smart Citations

On thermal effects in solid-state lasers: The case of ytterbium-doped materials

Chénais

Druon²,

Forget³

et al. 2006

Progress in Quantum Electronics

328

271

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A review of theoretical and experimental studies of thermal effects in solid-state lasers is presented, with a special focus on diode-pumped ytterbium-doped materials. A large part of this review provides however general information applicable to any kind of solid-state laser. Our aim here is not to make a list of the techniques that have been used to minimize thermal effects, but instead to give an overview of the theoretical aspects underneath, and give a state-of-the-art of the tools at the disposal of the laser scientist to measure thermal effects. After a presentation of some general properties of Yb-doped materials, we address the issue of evaluating the temperature map in Yb-doped laser crystals, both theoretically and experimentally. This is the first step before studying the complex problem of thermal lensing (part III). We will focus on some newly discussed aspects, like the definition of the thermo-optic coefficient: we will highlight some misleading interpretations of thermal lensing experiments due to the use of the dn/dT parameter in a context where it is not relevant. Part IV will be devoted to a state-of-the-art of experimental techniques used to measure thermal lensing. Eventually, in part V, we will give some concrete examples in Yb-doped materials, where their peculiarities will be pointed out.

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Section: Iv43 Methods Based On Shack-hartmann Wavefront Sensingmentioning

confidence: 99%

“…For a qualitative discussion of fracture issues in Yb-doped materials, the reader is invited to refer to a previous publication [73].…”

Section: Iii2 Stress and Strain Calculationsmentioning

confidence: 99%

See 1 more Smart Citation

On thermal effects in solid-state lasers: The case of ytterbium-doped materials

Chénais

Druon²,

Forget³

et al. 2006

Progress in Quantum Electronics

328

271

View full text Add to dashboard Cite

show abstract

“…Therefore, these effects attract much attention and the results of previous investigation of this problem for lasers with the edge lamp pumping are described in many monographs and textbooks [1][2][3][4][5][6][7]. A new stage of the investigations of the thermal effects started with the development of solid-state lasers with longitudinal pumping by laser diodes [6][7][8][9][10][11][12]. Laser-diode pumped solid-state lasers are nowadays covering a wide range of applications.…”

Section: Introductionmentioning

confidence: 99%

Numerical treatment of the temperature distribution in end-pumped composite laser rods

Dement'ev¹

2007

Lithuanian J. Phys.

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Analytical and numerical studies of the thermal characteristics of conventional and composite laser rods in laser-diode endpumped geometry are reported in detail using Nd : YAG rods as an example. It has been shown that taking into account the temperature dependence of the heat conductivity, the change of the temperature in the active element can be significantly higher compared to the data for the temperature-independent heat conductivity coefficient. It has been found that the dependence of heat conductivity on temperature causes the non-parabolic heat distribution even in the region inside the pump beam with the top hat intensity distribution. It has also been shown by direct numerical simulations that the undoped entrance section of the composite rod significantly reduces the peak temperature rise inside the crystal.

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“…The value of heat transfer coefficient hT is highly dependent on the thermal interfaces of the sample during the experiment and it is typically regarded as adjustable parameter for thermal calculations. Typical hT value accounting for the surface radiation and convection between the air/sample interfaces is ~10 Wm -2 K -1 for each of the two cases [158,159], whereas hT value for a sample in bare contact with water-cooled copper holder can be as high as 2500 Wm -2 K -1 [160]. Since only a small part of the KGd0.43Yb0.57(WO4)2 sample was clamped by two small copper plates during the measurements (see Figure 5.5) and no special effort was applied to improve the thermal contact between the sample and holder, a rather conservative hT value of 20 Wm -2 K -1 is employed for all surfaces of the sample in the numerical calculation.…”

Section: +mentioning

confidence: 99%

Potassium double tungstate waveguides with high ytterbium concentration for optical amplification

Yong

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Cover design: Three dimensional visualization of optical amplification in potassium double tungstate waveguide layer as a signal beam propagates from the top surface to the bottom surface. The model has a radius equivalent to about twenty times the optical beam's radius and only a quarter of the body is shown. The intensity of the signal beam is represented by the color spectrum (red being lowest and blue being highest). The wire frame is generated based on finite element mesh grids.

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Thermal lensing in diode-pumped ytterbium Lasers-Part I: theoretical analysis and wavefront measurements

Cited by 116 publications

References 54 publications

On thermal effects in solid-state lasers: The case of ytterbium-doped materials

On thermal effects in solid-state lasers: The case of ytterbium-doped materials

Numerical treatment of the temperature distribution in end-pumped composite laser rods

Potassium double tungstate waveguides with high ytterbium concentration for optical amplification

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