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Broadening of the second-harmonic phase-matching bandwidth in a temperature-gradient-controlled periodically poled Ti:LiNbO3 channel waveguide

Yeung Lak Lee, Young-Chul Noh, Changsoo Jung, Tae Jun Yu, Do-Kyeong Ko, and Jongmin Lee

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Abstract

We have demonstrated broadening of the phase-matching bandwidth in a periodically poled Ti:LiNbO3 (Ti:PPLN) channel waveguide (Λ=16.6 µm) by using a temperature-gradient-control technique. With this technique, we have achieved a second-harmonic phase-matching bandwidth of more than 13 nm in a 74-mm-long Ti:PPLN waveguide, which has a 0.21-nm phase-matching bandwidth at a uniform temperature.

©2003 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. SHG curve at room temperature (25 °C) with coupled fundamental power of 1.16 mW. The maximum conversion efficiency is measured to be 890%/W. Scattering and solid curve, experimental and theoretical results, respectively. Inset, theoretical refractive index (n SH-n P) modulation along the Ti waveguides.

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Fig. 2.
Fig. 2. Experimental setup for SHG. ECL and PC denote extended-cavity laser and polarization controller, respectively.

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Fig. 3.
Fig. 3. Circles, temperature at each position of sample holder; triangles, SH phase-matching wavelength for different sample temperatures.

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Fig. 4.
Fig. 4. SH curve for different temperature gradients. (a) Intensity mapping for theoretical simulation; highest intensity (red) to lowest intensity (blue). (b) Theoretical results for SH curves for three different temperature gradients. (c) Experimental results for SH curves for three different temperature gradients.

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Fig. 5.
Fig. 5. SH efficiency and SH bandwidth for different temperature gradients. Triangles and circles, SH efficiency and SH bandwidth, respectively (measured with 1 mW of pump wave). Curves, theoretical results. Solid and dotted curves, SH efficiency and SH bandwidth, respectively.

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Equations (6)

Equations on this page are rendered with MathJax. Learn more.

d A 1 d z = − i κ A 3 A 1 * exp ( − i Δ k z ) ,
d A 3 d z = − i κ A 1 2 exp ( i Δ k z ) ,
T ( z ) = T ( 0 ) + [ T ( L ) − T ( 0 ) ] ( z L ) ,
Δ k ( z ) = 4 π λ P [ n SH ( T ) − n P ( T ) ] − 2 π Λ ′ ( z ) ,
δ ( Δ k Λ ) = δ ( Δ k ) Λ + Δ k δ Λ
= 2 π [ d n SH d T − d n P d T n SH − n P + α ] δ T ,
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