Heat Generation and Removal in Solid State Lasers

Ashoori, Vahid; Shayganmanesh, Mahdi; Radmard, Saeid

doi:10.5772/52381

Cited by 10 publications

(9 citation statements)

References 65 publications

(90 reference statements)

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“…27 Furthermore, depending on the configuration of the gain medium and the cooling geometry, the heat deposited can flow in most of the desired direction within the gain medium, causing a thermal gradient. 28 For example, in traditional water-cooled thermo-optic, most heat removal occurs in the radius direction, leading to significant radial thermal gradients in the thermo-optical material. A schematic configuration of the end pumping process for solid-state lasers is shown in Fig.…”

Section: Heat Generation and Distributionmentioning

confidence: 99%

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Active control of focus position of laser beams using thermally induced lensing

Bell

Mabena

Naidoo

2023

Laser Resonators, Microresonators, and Beam Control XXV

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In this paper, we present a method for active control of thermally induced lensing in high-power lasers. We used thermal lensing to study the advantages of high-power lasers. Many delivery optics are sensitive to the thermally induced lens, which can change the focus position of the transmitted beam. To compensate for this, we used thermal lensing by pumping a crystal that had no absorption or amplification at the seed beam wavelength. By controlling the strength of the heat source, we demonstrate acute control of the focus position. Our modelling work is based on the finite-volume method (FVM) to analyse thermal effects in end-pumped solid-state crystals. This work has the potential to pave the way for active control of a thermally induced lens in high-powered laser-based applications.

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Section: Heat Generation and Distributionmentioning

confidence: 99%

“…We also assume that the thermal conductivity of the materials does not change more than 10%. 28 The stable state is discussed with the assumption that the thermal conductivity (k) is constant. Hence Eqn .…”

Section: Heat Generation and Distributionmentioning

confidence: 99%

Active control of focus position of laser beams using thermally induced lensing

Bell

Mabena

Naidoo

2023

Laser Resonators, Microresonators, and Beam Control XXV

View full text Add to dashboard Cite

show abstract

“…It is to be noted that the azimuthal variation of the temperature is ignored due to the cylindrical symmetry of the fiber [24]. T 1(r, z) and T 2(r, z) are the temperatures in the core and cladding regions, respectively.…”

Section: Theoretical Analysis Of the Heat Dissipation Mechanismmentioning

confidence: 99%

“…The quantities a and b are core cladding radii, respectively [30]. The steady-state heat equations for both core and cladding regions are given as follows [24,36,37]:…”

Section: Theoretical Analysis Of the Heat Dissipation Mechanismmentioning

confidence: 99%

“…Actually, from a historical point of view, breaking the 1 kW barrier in 2002 has been one of the most important milestones in the evolution of fiber lasers [4]. Since then, astonishingly rapid progress in pumping configurations [20][21][22], cooling techniques and technologies [23,24], fiber design, an fabrication as well as the fundamental fiber geometry itself [25], has led to an unprecedented increase in the average power. Hence, heating and its beam-distorting effects have become again a current issue as the powers continue to increase for very short high-power lasers due to heavy thermal load that can give rise to permanent defects on the clad and coating materials [26,27].…”

Section: Introductionmentioning

confidence: 99%

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Theoretical analysis of doping management and its effects on power scaling

Gursel¹,

Elahi²,

Ilday³

et al. 2016

Turk J Elec Eng & Comp Sci

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Thermal load and nonlinear effects are two contrary phenomena that make up important drawbacks in rapid progress of high-power fiber lasers. To minimize the thermal load, which limits the average power, doping concentration should be decreased, which brings about increasing length of the fiber. In contrast, the presence of nonlinear effects and their management demand the use of high-doped, shorter fibers in order to maximize the peak power. Management on doping of gain fiber and obtaining a specific doping profile function along the short gain fiber is a proposed solution for prevention of the exchange between thermal load and nonlinear effects. The study shows two different approaches for keeping the temperature levels down in addition to obtaining power scaling profiles.

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Analytical thermal modeling of graphene-clad microfiber as a saturable absorber in ultrafast fiber lasers

Ashoori

Shayganmanesh

2019

Appl. Phys. B

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Heat Generation and Removal in Solid State Lasers

Cited by 10 publications

References 65 publications

Active control of focus position of laser beams using thermally induced lensing

Active control of focus position of laser beams using thermally induced lensing

Theoretical analysis of doping management and its effects on power scaling

Analytical thermal modeling of graphene-clad microfiber as a saturable absorber in ultrafast fiber lasers

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