Pyroelectricity and its role in optical damage of potassium titanyl phosphate crystals

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The origin of optical damage in potassium titanyl phosphate (KTP) crystals has been vigorously investigated since its introduction as a nonlinear optical material in 1976. It is well known that this material exhibits a laser damage threshold that limits its use in many high average-power applications, especially frequency doubling of Nd-doped lasers. Both photochromic and electrochromic damage can be induced in KTP. Until recently, it was thought that these two types of damage were distinctly different, possibly involving different mechanisms; however, new data show that electrochromic-like damage can be induced in KT? by laser irradiation only, implying the existence of ... continued below

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8 p.

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Cooke, D.W.; Bennett, B.L.; Thomas, J.C. & Petrin, R.R. December 1, 1996.

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The origin of optical damage in potassium titanyl phosphate (KTP) crystals has been vigorously investigated since its introduction as a nonlinear optical material in 1976. It is well known that this material exhibits a laser damage threshold that limits its use in many high average-power applications, especially frequency doubling of Nd-doped lasers. Both photochromic and electrochromic damage can be induced in KTP. Until recently, it was thought that these two types of damage were distinctly different, possibly involving different mechanisms; however, new data show that electrochromic-like damage can be induced in KT? by laser irradiation only, implying the existence of an internal electric field. We have recently observed bursts of light (optical scintillations) when heating KTP crystals at 0.1 - 1.0 K/s in the temperature range 8 - 675 K. The scintillations correspond to molecular nitrogen emission occurring during the electrical breakdown of air near the crystal surface, and imply the existence of pyroelectric fields in KTP exceeding 30 kV/cm. These fields (and concomitant currents) were induced by 10.6 {mu}m laser irradiation. The observation of pyroelectric effects, heretofore not considered in KTP damage models, provides an important new insight into the possible cause of the recently observed {open_quotes}electrochromic-like{close_quotes} photochromic damage in KTP.

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8 p.

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OSTI as DE97001719

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  • 28. annual symposium on optical materials for high power lasers - Boulder damage symposium, Boulder, CO (United States), 7-9 Oct 1996

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  • Other: DE97001719
  • Report No.: LA-UR--96-3605
  • Report No.: CONF-961070--2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 414634
  • Archival Resource Key: ark:/67531/metadc687022

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  • December 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • May 23, 2016, 1:37 p.m.

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Cooke, D.W.; Bennett, B.L.; Thomas, J.C. & Petrin, R.R. Pyroelectricity and its role in optical damage of potassium titanyl phosphate crystals, article, December 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc687022/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.