Abstract

We investigate the effect of water impurity in a CsLiB6O10 (CLBO) crystal on the ultraviolet properties of the bulk laser-induced damage threshold (LIDT) and transmittance. The water impurity was eliminated by heating the CLBO sample with dimensions of 5mm×5mm×10mm at 150°C in an ambient atmosphere and subsequently in a dry atmosphere. The bulk LIDT of the sample after heat treatment improved by about 1.6-fold compared with that before heat treatment.

© 2009 Optical Society of America

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  1. Y. Mori, I. Kuroda, S. Nakajima, T. Sasaki, and S. Nakai, “New nonlinear optical crystal: cesium lithium borate,” Appl. Phys. Lett. 67, 1818-1820 (1995).
    [Crossref]
  2. Y. Mori and T. Sasaki, “Development of new NLO borate crystals,” Bull. Mater. Sci. 22, 399-403 (1999).
    [Crossref]
  3. A. Taguchi, A. Miyamoto, Y. Mori, S. Haramura, T. Inoue, K. Nishijima, Y. Kagebayashi, H. Sakai, Y. Yap, and T. Sasaki, “Effects of the moisture on CLBO,” in Advanced Solid State Lasers, C. Pollock and W. Bosenberg, eds., Vol. 10 of OSA Trends in Optics and Photonics Series (Optical Society of America, 1997), paper US6.
  4. Y. K. Yap, T. Inoue, H. Sakai, Y. Kagebayashi, Y. Mori, and T. Sasaki, “Long-term operation of CsLiB6O10 at elevated crystal temperature,” Opt. Lett. 23, 34-36 (1998).
    [Crossref]
  5. F. Pan, X. Wang, G. Shen, and D. Shen, “Cracking mechanism in CLBO crystals at room temperature,” J. Cryst. Growth 241, 129-134 (2002).
    [Crossref]
  6. L. Kovács, K. Lengyel, Á. Péter, K. Polgár, and A. Beran, “IR absorption spectroscopy of water in CsLiB6O10 crystals,” Opt. Mater. 24, 457-463 (2003).
    [Crossref]
  7. L. Isaenko, I. Vasilyeva, A. Merkulov, A. Tomilenko, I. Bogdanova, V. Malakhov, and V. Drebushchak, “CsLiB6O10 crystals with Cs deficit: structure and properties,” J. Cryst. Growth 282, 407-413 (2005).
    [Crossref]
  8. M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, T. Sasaki, T. Katsura, T. Kojima, and J. Nishimae, “Improvement in UV optical properties of CsLiB6O10 by reducing water molecules in the crystal,” Jpn. J. Appl. Phys. 44, L699-L700 (2005).
    [Crossref]
  9. M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, and T. Sasaki, “Growth of CsLiB6O10 crystals with high laser-damage tolerance,” J. Cryst. Growth 279, 76-81 (2005).
    [Crossref]
  10. Y. Morimoto, S. Miyazawa, and Y. Kagebayashi, “Water-associated surface degradation of CsLiB6O10 crystal during harmonic generation in the ultraviolet region,” J. Mater. Res. 16, 2082-2090 (2001).
    [Crossref]
  11. N. Umemura and K. Kato, “Ultraviolet generation tunable to 0.185 mm in CsLiB6O10,” Appl. Opt. 36, 6794-6796(1997).
    [Crossref]

2005 (3)

L. Isaenko, I. Vasilyeva, A. Merkulov, A. Tomilenko, I. Bogdanova, V. Malakhov, and V. Drebushchak, “CsLiB6O10 crystals with Cs deficit: structure and properties,” J. Cryst. Growth 282, 407-413 (2005).
[Crossref]

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, T. Sasaki, T. Katsura, T. Kojima, and J. Nishimae, “Improvement in UV optical properties of CsLiB6O10 by reducing water molecules in the crystal,” Jpn. J. Appl. Phys. 44, L699-L700 (2005).
[Crossref]

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, and T. Sasaki, “Growth of CsLiB6O10 crystals with high laser-damage tolerance,” J. Cryst. Growth 279, 76-81 (2005).
[Crossref]

2003 (1)

L. Kovács, K. Lengyel, Á. Péter, K. Polgár, and A. Beran, “IR absorption spectroscopy of water in CsLiB6O10 crystals,” Opt. Mater. 24, 457-463 (2003).
[Crossref]

2002 (1)

F. Pan, X. Wang, G. Shen, and D. Shen, “Cracking mechanism in CLBO crystals at room temperature,” J. Cryst. Growth 241, 129-134 (2002).
[Crossref]

2001 (1)

Y. Morimoto, S. Miyazawa, and Y. Kagebayashi, “Water-associated surface degradation of CsLiB6O10 crystal during harmonic generation in the ultraviolet region,” J. Mater. Res. 16, 2082-2090 (2001).
[Crossref]

1999 (1)

Y. Mori and T. Sasaki, “Development of new NLO borate crystals,” Bull. Mater. Sci. 22, 399-403 (1999).
[Crossref]

1998 (1)

1997 (1)

1995 (1)

Y. Mori, I. Kuroda, S. Nakajima, T. Sasaki, and S. Nakai, “New nonlinear optical crystal: cesium lithium borate,” Appl. Phys. Lett. 67, 1818-1820 (1995).
[Crossref]

Beran, A.

L. Kovács, K. Lengyel, Á. Péter, K. Polgár, and A. Beran, “IR absorption spectroscopy of water in CsLiB6O10 crystals,” Opt. Mater. 24, 457-463 (2003).
[Crossref]

Bogdanova, I.

L. Isaenko, I. Vasilyeva, A. Merkulov, A. Tomilenko, I. Bogdanova, V. Malakhov, and V. Drebushchak, “CsLiB6O10 crystals with Cs deficit: structure and properties,” J. Cryst. Growth 282, 407-413 (2005).
[Crossref]

Drebushchak, V.

L. Isaenko, I. Vasilyeva, A. Merkulov, A. Tomilenko, I. Bogdanova, V. Malakhov, and V. Drebushchak, “CsLiB6O10 crystals with Cs deficit: structure and properties,” J. Cryst. Growth 282, 407-413 (2005).
[Crossref]

Haramura, S.

A. Taguchi, A. Miyamoto, Y. Mori, S. Haramura, T. Inoue, K. Nishijima, Y. Kagebayashi, H. Sakai, Y. Yap, and T. Sasaki, “Effects of the moisture on CLBO,” in Advanced Solid State Lasers, C. Pollock and W. Bosenberg, eds., Vol. 10 of OSA Trends in Optics and Photonics Series (Optical Society of America, 1997), paper US6.

Inoue, T.

Y. K. Yap, T. Inoue, H. Sakai, Y. Kagebayashi, Y. Mori, and T. Sasaki, “Long-term operation of CsLiB6O10 at elevated crystal temperature,” Opt. Lett. 23, 34-36 (1998).
[Crossref]

A. Taguchi, A. Miyamoto, Y. Mori, S. Haramura, T. Inoue, K. Nishijima, Y. Kagebayashi, H. Sakai, Y. Yap, and T. Sasaki, “Effects of the moisture on CLBO,” in Advanced Solid State Lasers, C. Pollock and W. Bosenberg, eds., Vol. 10 of OSA Trends in Optics and Photonics Series (Optical Society of America, 1997), paper US6.

Isaenko, L.

L. Isaenko, I. Vasilyeva, A. Merkulov, A. Tomilenko, I. Bogdanova, V. Malakhov, and V. Drebushchak, “CsLiB6O10 crystals with Cs deficit: structure and properties,” J. Cryst. Growth 282, 407-413 (2005).
[Crossref]

Kagebayashi, Y.

Y. Morimoto, S. Miyazawa, and Y. Kagebayashi, “Water-associated surface degradation of CsLiB6O10 crystal during harmonic generation in the ultraviolet region,” J. Mater. Res. 16, 2082-2090 (2001).
[Crossref]

Y. K. Yap, T. Inoue, H. Sakai, Y. Kagebayashi, Y. Mori, and T. Sasaki, “Long-term operation of CsLiB6O10 at elevated crystal temperature,” Opt. Lett. 23, 34-36 (1998).
[Crossref]

A. Taguchi, A. Miyamoto, Y. Mori, S. Haramura, T. Inoue, K. Nishijima, Y. Kagebayashi, H. Sakai, Y. Yap, and T. Sasaki, “Effects of the moisture on CLBO,” in Advanced Solid State Lasers, C. Pollock and W. Bosenberg, eds., Vol. 10 of OSA Trends in Optics and Photonics Series (Optical Society of America, 1997), paper US6.

Kanoh, A.

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, and T. Sasaki, “Growth of CsLiB6O10 crystals with high laser-damage tolerance,” J. Cryst. Growth 279, 76-81 (2005).
[Crossref]

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, T. Sasaki, T. Katsura, T. Kojima, and J. Nishimae, “Improvement in UV optical properties of CsLiB6O10 by reducing water molecules in the crystal,” Jpn. J. Appl. Phys. 44, L699-L700 (2005).
[Crossref]

Kato, K.

Katsura, T.

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, T. Sasaki, T. Katsura, T. Kojima, and J. Nishimae, “Improvement in UV optical properties of CsLiB6O10 by reducing water molecules in the crystal,” Jpn. J. Appl. Phys. 44, L699-L700 (2005).
[Crossref]

Kojima, T.

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, T. Sasaki, T. Katsura, T. Kojima, and J. Nishimae, “Improvement in UV optical properties of CsLiB6O10 by reducing water molecules in the crystal,” Jpn. J. Appl. Phys. 44, L699-L700 (2005).
[Crossref]

Kovács, L.

L. Kovács, K. Lengyel, Á. Péter, K. Polgár, and A. Beran, “IR absorption spectroscopy of water in CsLiB6O10 crystals,” Opt. Mater. 24, 457-463 (2003).
[Crossref]

Kuroda, I.

Y. Mori, I. Kuroda, S. Nakajima, T. Sasaki, and S. Nakai, “New nonlinear optical crystal: cesium lithium borate,” Appl. Phys. Lett. 67, 1818-1820 (1995).
[Crossref]

Lengyel, K.

L. Kovács, K. Lengyel, Á. Péter, K. Polgár, and A. Beran, “IR absorption spectroscopy of water in CsLiB6O10 crystals,” Opt. Mater. 24, 457-463 (2003).
[Crossref]

Malakhov, V.

L. Isaenko, I. Vasilyeva, A. Merkulov, A. Tomilenko, I. Bogdanova, V. Malakhov, and V. Drebushchak, “CsLiB6O10 crystals with Cs deficit: structure and properties,” J. Cryst. Growth 282, 407-413 (2005).
[Crossref]

Merkulov, A.

L. Isaenko, I. Vasilyeva, A. Merkulov, A. Tomilenko, I. Bogdanova, V. Malakhov, and V. Drebushchak, “CsLiB6O10 crystals with Cs deficit: structure and properties,” J. Cryst. Growth 282, 407-413 (2005).
[Crossref]

Miyamoto, A.

A. Taguchi, A. Miyamoto, Y. Mori, S. Haramura, T. Inoue, K. Nishijima, Y. Kagebayashi, H. Sakai, Y. Yap, and T. Sasaki, “Effects of the moisture on CLBO,” in Advanced Solid State Lasers, C. Pollock and W. Bosenberg, eds., Vol. 10 of OSA Trends in Optics and Photonics Series (Optical Society of America, 1997), paper US6.

Miyazawa, S.

Y. Morimoto, S. Miyazawa, and Y. Kagebayashi, “Water-associated surface degradation of CsLiB6O10 crystal during harmonic generation in the ultraviolet region,” J. Mater. Res. 16, 2082-2090 (2001).
[Crossref]

Mori, Y.

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, and T. Sasaki, “Growth of CsLiB6O10 crystals with high laser-damage tolerance,” J. Cryst. Growth 279, 76-81 (2005).
[Crossref]

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, T. Sasaki, T. Katsura, T. Kojima, and J. Nishimae, “Improvement in UV optical properties of CsLiB6O10 by reducing water molecules in the crystal,” Jpn. J. Appl. Phys. 44, L699-L700 (2005).
[Crossref]

Y. Mori and T. Sasaki, “Development of new NLO borate crystals,” Bull. Mater. Sci. 22, 399-403 (1999).
[Crossref]

Y. K. Yap, T. Inoue, H. Sakai, Y. Kagebayashi, Y. Mori, and T. Sasaki, “Long-term operation of CsLiB6O10 at elevated crystal temperature,” Opt. Lett. 23, 34-36 (1998).
[Crossref]

Y. Mori, I. Kuroda, S. Nakajima, T. Sasaki, and S. Nakai, “New nonlinear optical crystal: cesium lithium borate,” Appl. Phys. Lett. 67, 1818-1820 (1995).
[Crossref]

A. Taguchi, A. Miyamoto, Y. Mori, S. Haramura, T. Inoue, K. Nishijima, Y. Kagebayashi, H. Sakai, Y. Yap, and T. Sasaki, “Effects of the moisture on CLBO,” in Advanced Solid State Lasers, C. Pollock and W. Bosenberg, eds., Vol. 10 of OSA Trends in Optics and Photonics Series (Optical Society of America, 1997), paper US6.

Morimoto, Y.

Y. Morimoto, S. Miyazawa, and Y. Kagebayashi, “Water-associated surface degradation of CsLiB6O10 crystal during harmonic generation in the ultraviolet region,” J. Mater. Res. 16, 2082-2090 (2001).
[Crossref]

Nakai, S.

Y. Mori, I. Kuroda, S. Nakajima, T. Sasaki, and S. Nakai, “New nonlinear optical crystal: cesium lithium borate,” Appl. Phys. Lett. 67, 1818-1820 (1995).
[Crossref]

Nakajima, S.

Y. Mori, I. Kuroda, S. Nakajima, T. Sasaki, and S. Nakai, “New nonlinear optical crystal: cesium lithium borate,” Appl. Phys. Lett. 67, 1818-1820 (1995).
[Crossref]

Nishijima, K.

A. Taguchi, A. Miyamoto, Y. Mori, S. Haramura, T. Inoue, K. Nishijima, Y. Kagebayashi, H. Sakai, Y. Yap, and T. Sasaki, “Effects of the moisture on CLBO,” in Advanced Solid State Lasers, C. Pollock and W. Bosenberg, eds., Vol. 10 of OSA Trends in Optics and Photonics Series (Optical Society of America, 1997), paper US6.

Nishimae, J.

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, T. Sasaki, T. Katsura, T. Kojima, and J. Nishimae, “Improvement in UV optical properties of CsLiB6O10 by reducing water molecules in the crystal,” Jpn. J. Appl. Phys. 44, L699-L700 (2005).
[Crossref]

Nishioka, M.

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, and T. Sasaki, “Growth of CsLiB6O10 crystals with high laser-damage tolerance,” J. Cryst. Growth 279, 76-81 (2005).
[Crossref]

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, T. Sasaki, T. Katsura, T. Kojima, and J. Nishimae, “Improvement in UV optical properties of CsLiB6O10 by reducing water molecules in the crystal,” Jpn. J. Appl. Phys. 44, L699-L700 (2005).
[Crossref]

Pan, F.

F. Pan, X. Wang, G. Shen, and D. Shen, “Cracking mechanism in CLBO crystals at room temperature,” J. Cryst. Growth 241, 129-134 (2002).
[Crossref]

Péter, Á.

L. Kovács, K. Lengyel, Á. Péter, K. Polgár, and A. Beran, “IR absorption spectroscopy of water in CsLiB6O10 crystals,” Opt. Mater. 24, 457-463 (2003).
[Crossref]

Polgár, K.

L. Kovács, K. Lengyel, Á. Péter, K. Polgár, and A. Beran, “IR absorption spectroscopy of water in CsLiB6O10 crystals,” Opt. Mater. 24, 457-463 (2003).
[Crossref]

Sakai, H.

Y. K. Yap, T. Inoue, H. Sakai, Y. Kagebayashi, Y. Mori, and T. Sasaki, “Long-term operation of CsLiB6O10 at elevated crystal temperature,” Opt. Lett. 23, 34-36 (1998).
[Crossref]

A. Taguchi, A. Miyamoto, Y. Mori, S. Haramura, T. Inoue, K. Nishijima, Y. Kagebayashi, H. Sakai, Y. Yap, and T. Sasaki, “Effects of the moisture on CLBO,” in Advanced Solid State Lasers, C. Pollock and W. Bosenberg, eds., Vol. 10 of OSA Trends in Optics and Photonics Series (Optical Society of America, 1997), paper US6.

Sasaki, T.

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, T. Sasaki, T. Katsura, T. Kojima, and J. Nishimae, “Improvement in UV optical properties of CsLiB6O10 by reducing water molecules in the crystal,” Jpn. J. Appl. Phys. 44, L699-L700 (2005).
[Crossref]

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, and T. Sasaki, “Growth of CsLiB6O10 crystals with high laser-damage tolerance,” J. Cryst. Growth 279, 76-81 (2005).
[Crossref]

Y. Mori and T. Sasaki, “Development of new NLO borate crystals,” Bull. Mater. Sci. 22, 399-403 (1999).
[Crossref]

Y. K. Yap, T. Inoue, H. Sakai, Y. Kagebayashi, Y. Mori, and T. Sasaki, “Long-term operation of CsLiB6O10 at elevated crystal temperature,” Opt. Lett. 23, 34-36 (1998).
[Crossref]

Y. Mori, I. Kuroda, S. Nakajima, T. Sasaki, and S. Nakai, “New nonlinear optical crystal: cesium lithium borate,” Appl. Phys. Lett. 67, 1818-1820 (1995).
[Crossref]

A. Taguchi, A. Miyamoto, Y. Mori, S. Haramura, T. Inoue, K. Nishijima, Y. Kagebayashi, H. Sakai, Y. Yap, and T. Sasaki, “Effects of the moisture on CLBO,” in Advanced Solid State Lasers, C. Pollock and W. Bosenberg, eds., Vol. 10 of OSA Trends in Optics and Photonics Series (Optical Society of America, 1997), paper US6.

Shen, D.

F. Pan, X. Wang, G. Shen, and D. Shen, “Cracking mechanism in CLBO crystals at room temperature,” J. Cryst. Growth 241, 129-134 (2002).
[Crossref]

Shen, G.

F. Pan, X. Wang, G. Shen, and D. Shen, “Cracking mechanism in CLBO crystals at room temperature,” J. Cryst. Growth 241, 129-134 (2002).
[Crossref]

Taguchi, A.

A. Taguchi, A. Miyamoto, Y. Mori, S. Haramura, T. Inoue, K. Nishijima, Y. Kagebayashi, H. Sakai, Y. Yap, and T. Sasaki, “Effects of the moisture on CLBO,” in Advanced Solid State Lasers, C. Pollock and W. Bosenberg, eds., Vol. 10 of OSA Trends in Optics and Photonics Series (Optical Society of America, 1997), paper US6.

Tomilenko, A.

L. Isaenko, I. Vasilyeva, A. Merkulov, A. Tomilenko, I. Bogdanova, V. Malakhov, and V. Drebushchak, “CsLiB6O10 crystals with Cs deficit: structure and properties,” J. Cryst. Growth 282, 407-413 (2005).
[Crossref]

Umemura, N.

Vasilyeva, I.

L. Isaenko, I. Vasilyeva, A. Merkulov, A. Tomilenko, I. Bogdanova, V. Malakhov, and V. Drebushchak, “CsLiB6O10 crystals with Cs deficit: structure and properties,” J. Cryst. Growth 282, 407-413 (2005).
[Crossref]

Wang, X.

F. Pan, X. Wang, G. Shen, and D. Shen, “Cracking mechanism in CLBO crystals at room temperature,” J. Cryst. Growth 241, 129-134 (2002).
[Crossref]

Yap, Y.

A. Taguchi, A. Miyamoto, Y. Mori, S. Haramura, T. Inoue, K. Nishijima, Y. Kagebayashi, H. Sakai, Y. Yap, and T. Sasaki, “Effects of the moisture on CLBO,” in Advanced Solid State Lasers, C. Pollock and W. Bosenberg, eds., Vol. 10 of OSA Trends in Optics and Photonics Series (Optical Society of America, 1997), paper US6.

Yap, Y. K.

Yoshimura, M.

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, and T. Sasaki, “Growth of CsLiB6O10 crystals with high laser-damage tolerance,” J. Cryst. Growth 279, 76-81 (2005).
[Crossref]

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, T. Sasaki, T. Katsura, T. Kojima, and J. Nishimae, “Improvement in UV optical properties of CsLiB6O10 by reducing water molecules in the crystal,” Jpn. J. Appl. Phys. 44, L699-L700 (2005).
[Crossref]

Appl. Opt. (1)

Appl. Phys. Lett. (1)

Y. Mori, I. Kuroda, S. Nakajima, T. Sasaki, and S. Nakai, “New nonlinear optical crystal: cesium lithium borate,” Appl. Phys. Lett. 67, 1818-1820 (1995).
[Crossref]

Bull. Mater. Sci. (1)

Y. Mori and T. Sasaki, “Development of new NLO borate crystals,” Bull. Mater. Sci. 22, 399-403 (1999).
[Crossref]

J. Cryst. Growth (3)

F. Pan, X. Wang, G. Shen, and D. Shen, “Cracking mechanism in CLBO crystals at room temperature,” J. Cryst. Growth 241, 129-134 (2002).
[Crossref]

L. Isaenko, I. Vasilyeva, A. Merkulov, A. Tomilenko, I. Bogdanova, V. Malakhov, and V. Drebushchak, “CsLiB6O10 crystals with Cs deficit: structure and properties,” J. Cryst. Growth 282, 407-413 (2005).
[Crossref]

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, and T. Sasaki, “Growth of CsLiB6O10 crystals with high laser-damage tolerance,” J. Cryst. Growth 279, 76-81 (2005).
[Crossref]

J. Mater. Res. (1)

Y. Morimoto, S. Miyazawa, and Y. Kagebayashi, “Water-associated surface degradation of CsLiB6O10 crystal during harmonic generation in the ultraviolet region,” J. Mater. Res. 16, 2082-2090 (2001).
[Crossref]

Jpn. J. Appl. Phys. (1)

M. Nishioka, A. Kanoh, M. Yoshimura, Y. Mori, T. Sasaki, T. Katsura, T. Kojima, and J. Nishimae, “Improvement in UV optical properties of CsLiB6O10 by reducing water molecules in the crystal,” Jpn. J. Appl. Phys. 44, L699-L700 (2005).
[Crossref]

Opt. Lett. (1)

Opt. Mater. (1)

L. Kovács, K. Lengyel, Á. Péter, K. Polgár, and A. Beran, “IR absorption spectroscopy of water in CsLiB6O10 crystals,” Opt. Mater. 24, 457-463 (2003).
[Crossref]

Other (1)

A. Taguchi, A. Miyamoto, Y. Mori, S. Haramura, T. Inoue, K. Nishijima, Y. Kagebayashi, H. Sakai, Y. Yap, and T. Sasaki, “Effects of the moisture on CLBO,” in Advanced Solid State Lasers, C. Pollock and W. Bosenberg, eds., Vol. 10 of OSA Trends in Optics and Photonics Series (Optical Society of America, 1997), paper US6.

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Figures (6)

Fig. 1
Fig. 1

Schematic of the experimental setup of bulk LIDT measurement using high repetition rate UV pulse light.

Fig. 2
Fig. 2

Typical result of bulk LIDT measurement.

Fig. 3
Fig. 3

Change of IR transmittance spectrum with heat duration at 150 ° C .

Fig. 4
Fig. 4

Dependence of IR transmittance around (a)  3400 cm 1 and (b)  3600 cm 1 on heat duration at 150 ° C in ambient atmosphere (days 0–5, □) and in a dry (with Ar gas flow) atmosphere (days 5–13, ▪). The insets in each figure show the dependence of IR transmittance of a 2 mm thick sample on heat duration at 150 ° C in ambient atmosphere for 24 h .

Fig. 5
Fig. 5

Dependence on heat duration of input power needed for bulk damage to occur at 150 ° C in ambient atmosphere (days 0–5, ) and in a dry (with Ar gas flow) atmosphere (days 5–8, ▪).

Fig. 6
Fig. 6

Dependence of UV transmittance on heat duration at 150 ° C in ambient atmosphere (days 0–5, ) and in a dry (with Ar gas flow) atmosphere (days 5–8, ▪).

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