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Applied Optics

Applied Optics


  • Vol. 35, Iss. 9 — Mar. 20, 1996
  • pp: 1489–1491

Effect of water vapor in a y-cut lithium niobate waveguide

M. Ahmad, K. Chelapathi, and Y. G. K. Patro  »View Author Affiliations

Applied Optics, Vol. 35, Issue 9, pp. 1489-1491 (1996)

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In z-cut lithium niobate (LiNbO3) samples, surface damage has been observed after diffusion in a wet atmosphere, but recent reports show that with controlled flow of water vapor waveguides with good surface morphology and low loss can be obtained. Y-cut waveguides do not show any surface damage. Fabrication of y-cut waveguides diffused with controlled variation of water vapor in the ambient has not been reported to the best of our knowledge. We show that a minimum loss in y-cut waveguides is obtained at a particular water vapor content in the ambient, which is lower than the loss obtained for waveguides diffused in dry ambient. We have found a decrease in the waveguide loss to 0.3 dB/cm from 0.6 dB/cm for 1 mL of water vapor passed per hour as compared with a dry atmosphere.

© 1996 Optical Society of America

Original Manuscript: January 6, 1995
Revised Manuscript: June 9, 1995
Published: March 20, 1996

M. Ahmad, K. Chelapathi, and Y. G. K. Patro, "Effect of water vapor in a y-cut lithium niobate waveguide," Appl. Opt. 35, 1489-1491 (1996)

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