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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 7 — Apr. 7, 2014
  • pp: 7783–7789

Trapped charge density analysis of KTN crystal by beam path measurement

Chenhui Huang, Yuzo Sasaki, Jun Miyazu, Seiji Toyoda, Tadayuki Imai, and Junya Kobayashi  »View Author Affiliations

Optics Express, Vol. 22, Issue 7, pp. 7783-7789 (2014)

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Because the function of a single crystal of potassium tantalate niobate (KTa1-xNbxO3, KTN) is largely decided by the trapped charge density inside it, it is essential to determine its value. We quantitatively estimate the charge density using two optical analysis methods, namely by investigating KTN’s deflection angle when it is used as a deflector and by investigating KTN’s focal length when it is used as a graded-index (GRIN) lens. A strobe technique is introduced with which to perform the measurement. The charge density values under different temperature conditions are shown. These results suggest that the charge density can be determined with both methods, and is constant in a specific temperature range. The charge density value is around 80 C/m3 in our setup.

© 2014 Optical Society of America

OCIS Codes
(230.2090) Optical devices : Electro-optical devices
(260.1180) Physical optics : Crystal optics

ToC Category:

Original Manuscript: December 26, 2013
Revised Manuscript: January 30, 2014
Manuscript Accepted: January 30, 2014
Published: March 27, 2014

Chenhui Huang, Yuzo Sasaki, Jun Miyazu, Seiji Toyoda, Tadayuki Imai, and Junya Kobayashi, "Trapped charge density analysis of KTN crystal by beam path measurement," Opt. Express 22, 7783-7789 (2014)

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