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- W3047383131 abstract "Abstract We present data and analysis of the laser-induced ablation of pure tantalum (Ta, $$Z=73$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>Z</mml:mi> <mml:mo>=</mml:mo> <mml:mn>73</mml:mn> </mml:mrow> </mml:math> ). We have identified different physical regimes using a wide range of laser pulse durations. A comparison of the influence of strongly varying laser pulse parameters on high-Z materials is presented. The crater depth caused by three different laser systems of pulse duration $${varDelta }tau _1=5,mathrm {ns}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>Δ</mml:mi> <mml:msub> <mml:mi>τ</mml:mi> <mml:mn>1</mml:mn> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>5</mml:mn> <mml:mspace /> <mml:mi>ns</mml:mi> </mml:mrow> </mml:math> and wavelength $$lambda _1=1064,mathrm {nm}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msub> <mml:mi>λ</mml:mi> <mml:mn>1</mml:mn> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>1064</mml:mn> <mml:mspace /> <mml:mi>nm</mml:mi> </mml:mrow> </mml:math> , $${varDelta }tau _2=35,mathrm {ps}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>Δ</mml:mi> <mml:msub> <mml:mi>τ</mml:mi> <mml:mn>2</mml:mn> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>35</mml:mn> <mml:mspace /> <mml:mi>ps</mml:mi> </mml:mrow> </mml:math> , $$lambda _2=355,mathrm {nm}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msub> <mml:mi>λ</mml:mi> <mml:mn>2</mml:mn> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>355</mml:mn> <mml:mspace /> <mml:mi>nm</mml:mi> </mml:mrow> </mml:math> and $${varDelta }tau _3=8.5,mathrm {fs}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>Δ</mml:mi> <mml:msub> <mml:mi>τ</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>8.5</mml:mn> <mml:mspace /> <mml:mi>fs</mml:mi> </mml:mrow> </mml:math> , $$lambda _3=790,mathrm {nm}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msub> <mml:mi>λ</mml:mi> <mml:mn>3</mml:mn> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>790</mml:mn> <mml:mspace /> <mml:mi>nm</mml:mi> </mml:mrow> </mml:math> are analyzed via confocal microscopy as a function of laser fluence and intensity. The minimum laser fluence needed for ablation, called threshold fluence, decreases with shorter pulse duration from $$1.10,mathrm {J/cm}^2$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>1.10</mml:mn> <mml:mspace /> <mml:msup> <mml:mrow> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>cm</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msup> </mml:mrow> </mml:math> for the nanosecond laser to $$0.17,mathrm {J/cm}^2$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>0.17</mml:mn> <mml:mspace /> <mml:msup> <mml:mrow> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>cm</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msup> </mml:mrow> </mml:math> for the femtosecond laser." @default.
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- W3047383131 date "2020-08-05" @default.
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- W3047383131 title "Laser-induced ablation of tantalum in a wide range of pulse durations" @default.
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