Pump-probe method for investigating laser ablation and optical damage threshold mechanisms in optical materials

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The method developed for investigating laser-surface interactions by measuring the ratio of ablation threshold fluence for a pair of picosecond or subpicosecond laser pulses to the single-pulse ablation threshold, was applied to ZnS (wurtzite)and to the borosilicate glass BK-7. Each sample was exposed to 1000 pulse pairs of 580-nm dye laser radiation. For ZnS, linear absorption was found to be the cause of the cumulative optical damage mechanism; the linear absorption is probably caused by defects states (such as color centers) near the surface. The nonlinear behavior of BK-7 suggests that avalanche ionization could be the damage mechanism. Results for ... continued below

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14 p.

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Chase, L.L. September 1, 1993.

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Description

The method developed for investigating laser-surface interactions by measuring the ratio of ablation threshold fluence for a pair of picosecond or subpicosecond laser pulses to the single-pulse ablation threshold, was applied to ZnS (wurtzite)and to the borosilicate glass BK-7. Each sample was exposed to 1000 pulse pairs of 580-nm dye laser radiation. For ZnS, linear absorption was found to be the cause of the cumulative optical damage mechanism; the linear absorption is probably caused by defects states (such as color centers) near the surface. The nonlinear behavior of BK-7 suggests that avalanche ionization could be the damage mechanism. Results for both materials show that intrinsic multiphoton absorption mechanisms may not be significant indicators of optical damage mechanisms even when they lead to very high free-carrier densities and energy absorption.

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14 p.

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OSTI as DE94008291

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  • Nuclear instruments and methods in physics research on radiation effects in insulators, Nagoya (Japan), 5-10 Sep 1993

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  • Other: DE94008291
  • Report No.: UCRL-JC--114770
  • Report No.: CONF-9309259--5
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 144790
  • Archival Resource Key: ark:/67531/metadc618494

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Office of Scientific & Technical Information Technical Reports

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  • September 1, 1993

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 23, 2016, 11:52 a.m.

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Chase, L.L. Pump-probe method for investigating laser ablation and optical damage threshold mechanisms in optical materials, article, September 1, 1993; California. (digital.library.unt.edu/ark:/67531/metadc618494/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.