• Medientyp: E-Artikel
  • Titel: Femtosecond laser-induced damage threshold of nematic liquid crystals at 1030  nm
  • Beteiligte: Ramousse, Loic; Chériaux, Gilles; Claudet, Cyrille; Jullien, Aurélie
  • Erschienen: Optica Publishing Group, 2021
  • Erschienen in: Applied Optics
  • Umfang: 8050
  • Sprache: Englisch
  • DOI: 10.1364/ao.436236
  • ISSN: 1559-128X; 2155-3165
  • Schlagwörter: Atomic and Molecular Physics, and Optics ; Engineering (miscellaneous) ; Electrical and Electronic Engineering
  • Zusammenfassung: <jats:p>The laser-induced damage threshold (LIDT) of nematic liquid crystals is investigated in the femtosecond regime at <jats:inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mo>≃<!-- ≃ --></mml:mo> <mml:mn>1030</mml:mn> <mml:mspace width="thickmathspace" /> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mi mathvariant="normal">n</mml:mi> <mml:mi mathvariant="normal">m</mml:mi> </mml:mrow> </mml:math> </jats:inline-formula>. The thickness and breakdown of freely suspended thin films (<jats:inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mo>≃<!-- ≃ --></mml:mo> <mml:mn>100</mml:mn> <mml:mspace width="thickmathspace" /> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mi mathvariant="normal">n</mml:mi> <mml:mi mathvariant="normal">m</mml:mi> </mml:mrow> </mml:math> </jats:inline-formula>) of different mixtures (MLC2073, MLC2132, and E7) is monitored in real time by spectral-domain interferometry. The duration of laser pulses was varied from 180 fs to 1.8 ps for repetition rates ranging from single shot to 1 MHz. The dependence of the LIDT with pulse duration suggests a damage mechanism dominated by ionization mechanisms at low repetition rate and by linear absorption at high repetition rate. In the single-shot regime, LIDTs exceeding <jats:inline-formula> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mn>1</mml:mn> <mml:mspace width="thickmathspace" /> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mi mathvariant="normal">J</mml:mi> </mml:mrow> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>/</mml:mo> </mml:mrow> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msup> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mi mathvariant="normal">c</mml:mi> <mml:mi mathvariant="normal">m</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msup> </mml:mrow> </mml:math> </jats:inline-formula> are found for the three investigated mixtures. The LIDT of polyvinyl alcohol is also investigated by the same method.</jats:p>
  • Beschreibung: <jats:p>The laser-induced damage threshold (LIDT) of nematic liquid crystals is
    investigated in the femtosecond regime at <jats:inline-formula>
    <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline">
    <mml:mo>≃<!-- ≃ --></mml:mo>
    <mml:mn>1030</mml:mn>
    <mml:mspace width="thickmathspace" />
    <mml:mrow class="MJX-TeXAtom-ORD">
    <mml:mi mathvariant="normal">n</mml:mi>
    <mml:mi mathvariant="normal">m</mml:mi>
    </mml:mrow>
    </mml:math>
    </jats:inline-formula>. The thickness and breakdown of
    freely suspended thin films (<jats:inline-formula>
    <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline">
    <mml:mo>≃<!-- ≃ --></mml:mo>
    <mml:mn>100</mml:mn>
    <mml:mspace width="thickmathspace" />
    <mml:mrow class="MJX-TeXAtom-ORD">
    <mml:mi mathvariant="normal">n</mml:mi>
    <mml:mi mathvariant="normal">m</mml:mi>
    </mml:mrow>
    </mml:math>
    </jats:inline-formula>) of different mixtures (MLC2073,
    MLC2132, and E7) is monitored in real time by spectral-domain
    interferometry. The duration of laser pulses was varied from 180 fs to
    1.8 ps for repetition rates ranging from single shot to 1 MHz. The
    dependence of the LIDT with pulse duration suggests a damage mechanism
    dominated by ionization mechanisms at low repetition rate and by
    linear absorption at high repetition rate. In the single-shot regime,
    LIDTs exceeding <jats:inline-formula>
    <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline">
    <mml:mn>1</mml:mn>
    <mml:mspace width="thickmathspace" />
    <mml:mrow class="MJX-TeXAtom-ORD">
    <mml:mi mathvariant="normal">J</mml:mi>
    </mml:mrow>
    <mml:mrow class="MJX-TeXAtom-ORD">
    <mml:mo>/</mml:mo>
    </mml:mrow>
    <mml:mrow class="MJX-TeXAtom-ORD">
    <mml:msup>
    <mml:mrow class="MJX-TeXAtom-ORD">
    <mml:mi mathvariant="normal">c</mml:mi>
    <mml:mi mathvariant="normal">m</mml:mi>
    </mml:mrow>
    <mml:mn>2</mml:mn>
    </mml:msup>
    </mml:mrow>
    </mml:math>
    </jats:inline-formula> are found for the three investigated
    mixtures. The LIDT of polyvinyl alcohol is also investigated by the
    same method.</jats:p>
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