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• W4328007229 abstract "Abstract In a high-power laser system, when the surface pressure of the optical film caused by laser plasma shock wave is greater than the adhesion per unit area of the film layer, the film will produce mechanical damage, and in serious cases, the whole system may not work. Therefore, studying the formation mechanism of optical film surface pressure and impulse caused by laser plasma shock wave is the key to ensure the normal operation of the high-power laser system. In this article, by studying the relaxation process of laser plasma shock wave on the surface pressure of optical film, and using the time accumulation effect of various pressures on the surface of the optical film, the calculation model of impulse on the optical film’s surface formed by laser plasma shock waves was established, and the variation rules of the impulse <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:msub> <m:mrow> <m:mi>I</m:mi> </m:mrow> <m:mrow> <m:mtext>st</m:mtext> </m:mrow> </m:msub> </m:math> {I}_{text{st}} and impulse coefficient <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mi>j</m:mi> </m:math> j on the unit area of single-layer Al 2 O 3 and HfO 2 optical films with different parameters were obtained. When the incident laser wavelength <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mi>λ</m:mi> </m:math> lambda was 1,064 nm, the energy <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mi>E</m:mi> </m:math> E was <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mn>0.1</m:mn> <m:mspace width=.1em /> <m:mtext>J</m:mtext> </m:math> 0.1hspace{.1em}text{J} , the pulse width <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:msub> <m:mrow> <m:mi>t</m:mi> </m:mrow> <m:mrow> <m:mtext>p</m:mtext> </m:mrow> </m:msub> </m:math> {t}_{text{p}} was <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mn>10</m:mn> <m:mspace width=.25em /> <m:mtext>ns</m:mtext> </m:math> 10hspace{.25em}text{ns} , the focal length of the focusing lens <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mi>f</m:mi> </m:math> f was <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mn>350</m:mn> <m:mspace width=.25em /> <m:mtext>mm</m:mtext> </m:math> 350hspace{.25em}text{mm} , the distance between the film surface and the focal plane of the focusing lens <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:msub> <m:mrow> <m:mi>z</m:mi> </m:mrow> <m:mrow> <m:mn>0</m:mn> </m:mrow> </m:msub> </m:math> {z}_{0} was <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mn>5</m:mn> <m:mspace width=.5em /> <m:mtext>mm</m:mtext> </m:math> 5hspace{.5em}text{mm} , and the film radius <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mi>R</m:mi> </m:math> R was <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mn>5</m:mn> <m:mspace width=.5em /> <m:mtext>mm</m:mtext> </m:math> 5hspace{.5em}text{mm} , the calculation and simulation results show that the impulse <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:msub> <m:mrow> <m:mi>I</m:mi> </m:mrow> <m:mrow> <m:mtext>st</m:mtext> </m:mrow> </m:msub> </m:math> {I}_{text{st}} of the two films was <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mn>1</m:mn> <m:msup> <m:mrow> <m:mn>0</m:mn> </m:mrow> <m:mrow> <m:mo>−</m:mo> <m:mn>4</m:mn> </m:mrow> </m:msup> <m:mspace width=.5em /> <m:mtext>N</m:mtext> <m:mspace width=.5em /> <m:mtext>s</m:mtext> </m:math> 1{0}^{-4}hspace{.5em}text{N}hspace{.5em}text{s} order of magnitude, the impulse coefficient j of the two films was <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mn>1</m:mn> <m:msup> <m:mrow> <m:mn>0</m:mn> </m:mrow> <m:mrow> <m:mo>−</m:mo> <m:mn>5</m:mn> </m:mrow> </m:msup> <m:mspace width=.5em /> <m:mtext>N</m:mtext> <m:mspace width=.5em /> <m:mtext>s/J</m:mtext> </m:math> 1{0}^{-5}hspace{.5em}text{N}hspace{.5em}text{s/J} , the Al 2 O 3 film with small atomic number will obtain larger <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:msub> <m:mrow> <m:mi>I</m:mi> </m:mrow> <m:mrow> <m:mtext>st</m:mtext> </m:mrow> </m:msub> </m:math> {I}_{text{st}} and <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mi>j</m:mi> </m:math> j , <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:msub> <m:mrow> <m:mi>I</m:mi> </m:mrow> <m:mrow> <m:mtext>st</m:mtext> </m:mrow> </m:msub> </m:math> {I}_{text{st}} and <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mi>j</m:mi> </m:math> j of the two films increase with the increase of <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mi>E</m:mi> </m:math> E and <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mi>f</m:mi> </m:math> f , and <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:msub> <m:mrow> <m:mi>I</m:mi> </m:mrow> <m:mrow> <m:mtext>st</m:mtext> </m:mrow> </m:msub> </m:math> {I}_{text{st}} and <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mi>j</m:mi> </m:math> j of the two films decrease with the increase of <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:msub> <m:mrow> <m:mi>z</m:mi> </m:mrow> <m:mrow> <m:mn>0</m:mn> </m:mrow> </m:msub> </m:math> {z}_{0} and <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:msub> <m:mrow> <m:mi>t</m:mi> </m:mrow> <m:mrow> <m:mtext>p</m:mtext> </m:mrow> </m:msub> </m:math> {t}_{text{p}} . In the total impulse transfer time ( <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:msub> <m:mrow> <m:mi>t</m:mi> </m:mrow> <m:mrow> <m:mn>0</m:mn> </m:mrow> </m:msub> </m:math> {t}_{0} ), <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:msub> <m:mrow> <m:mi>I</m:mi> </m:mrow> <m:mrow> <m:mtext>st</m:mtext> </m:mrow> </m:msub> </m:math> {I}_{text{st}} and <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mi>j</m:mi> </m:math> j both increase with the increase of <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mi>R</m:mi> </m:math> R ." @default.
• W4328007229 created "2023-03-22" @default.
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• W4328007229 date "2023-01-01" @default.
• W4328007229 modified "2023-10-14" @default.
• W4328007229 title "Study on the impulse mechanism of optical films formed by laser plasma shock waves" @default.
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• W4328007229 doi "https://doi.org/10.1515/phys-2022-0237" @default.
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