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- W3190723504 abstract "The closed aperture continuous wave Z-scan of L-tryptophan at 661 nm was performed to investigate the variation of on-axis nonlinear phase shift <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mo stretchy=false>(</mml:mo> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mi mathvariant=normal>Δ<!-- Δ --></mml:mi> <mml:mrow class=MJX-TeXAtom-ORD> <mml:msub> <mml:mi mathvariant=normal>Φ<!-- Φ --></mml:mi> <mml:mn>0</mml:mn> </mml:msub> </mml:mrow> </mml:mrow> <mml:mo stretchy=false>)</mml:mo> </mml:math> with the change of optical field strength. <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mi mathvariant=normal>Δ<!-- Δ --></mml:mi> <mml:mrow class=MJX-TeXAtom-ORD> <mml:msub> <mml:mi mathvariant=normal>Φ<!-- Φ --></mml:mi> <mml:mn>0</mml:mn> </mml:msub> </mml:mrow> </mml:math> was found to vary nonlinearly with irradiance ( <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mrow class=MJX-TeXAtom-ORD> <mml:msub> <mml:mi>I</mml:mi> <mml:mn>0</mml:mn> </mml:msub> </mml:mrow> <mml:mo stretchy=false>)</mml:mo> </mml:math> in the range from 150 to <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mn>290</mml:mn> </mml:mrow> </mml:mrow> <mml:mspace width=thickmathspace /> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mspace width=thickmathspace /> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mi mathvariant=normal>M</mml:mi> <mml:mi mathvariant=normal>W</mml:mi> </mml:mrow> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mo>/</mml:mo> </mml:mrow> </mml:mrow> </mml:mrow> <mml:mrow class=MJX-TeXAtom-ORD> <mml:msup> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mi mathvariant=normal>m</mml:mi> </mml:mrow> </mml:mrow> <mml:mn>2</mml:mn> </mml:msup> </mml:mrow> </mml:math> . This nonlinear variation is explained by considering the effect of linear and nonlinear absorption of radiation on the thermo-optical refractive index. Using the quadratic fitting of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mi mathvariant=normal>Δ<!-- Δ --></mml:mi> <mml:mrow class=MJX-TeXAtom-ORD> <mml:msub> <mml:mi mathvariant=normal>Φ<!-- Φ --></mml:mi> <mml:mn>0</mml:mn> </mml:msub> </mml:mrow> </mml:math> with <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mrow class=MJX-TeXAtom-ORD> <mml:msub> <mml:mi>I</mml:mi> <mml:mn>0</mml:mn> </mml:msub> </mml:mrow> </mml:math> , we have found the thermo-optic coefficient of refractive index <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mi>d</mml:mi> <mml:mi>n</mml:mi> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mo>/</mml:mo> </mml:mrow> <mml:mi>d</mml:mi> <mml:mi>T</mml:mi> </mml:math> , thermal coefficient of nonlinear refractive index <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:msubsup> <mml:mi>n</mml:mi> <mml:mn>2</mml:mn> <mml:mi>T</mml:mi> </mml:msubsup> </mml:math> , and the nonlinear absorption coefficient <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline> <mml:mi>β<!-- β --></mml:mi> </mml:math> in the observed power regime." @default.
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- W3190723504 date "2021-09-07" @default.
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- W3190723504 title "Closed aperture CW Z-scan of L-tryptophan for determination of optical nonlinearity in the thermal regime" @default.
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