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Ramousse, Loic;
Chériaux, Gilles;
Claudet, Cyrille;
Jullien, Aurélie
Femtosecond laser-induced damage threshold of nematic liquid crystals at 1030 nm
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- 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> - Anmerkungen: