Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Estimation of the Ratio of Nonlinear Optical Tensor Components by Measuring Second Harmonic Generation and Parametric Down Conversion Outputs in a Single Periodically Poled LiNbO3 Crystal

  • Kumar, CH. S.S. Pavan (Department of Physics, Pusan National University) ;
  • Kim, Jiung (Department of Physics, Pusan National University) ;
  • Kim, Byoung Joo (Department of Physics, Pusan National University) ;
  • Cha, Myoungsik (Department of Physics, Pusan National University)
  • Received : 2018.09.10
  • Accepted : 2018.11.13
  • Published : 2018.12.25
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Abstract

Measurement of the nonlinear optical coefficients is not an easy task since it requires complicated experimental setup and analysis. We suggest an easy way to estimate the relative nonlinear optical tensor components by direct measurement of the output powers of the second harmonic generation and spontaneous parametric down conversion experiments. The experiments were done in quasi-phase-matched type-0 as well as type-1 interactions at similar pump wavelengths in a 5% MgO-doped periodically poled $LiNbO_3$ crystal to obtain the ratio of the nonlinear optical tensor components $d_{33}/d_{31}$ in each experiment. The obtained ratios were then compared with the previously ascertained values [J. Opt. Soc. Am. B, 14, 2268-2294 (1997)].

Keywords

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FIG. 1. Schematic of the experimental setup (a), and polarization configurations (b): (i) type-0 SHG, (ii) type-1 SHG, (iii) type-0 SPDC and (iv) type-1 SPDC. Gray arrows: propagation direction along x-axis, blue arrows and crossed circles: polarization directions.

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FIG. 2. SHG power versus temperature for type-0 pumped at 990.6 nm (left) and type-1 pumped at 970.8 nm (right). Open triangles: type-0 data, open squares: type-1 data, dots: Type-0 (red), Type-1 (blue) QPM bands calculated based on Sellmeier equations [15] for fifteen different wavelengths within each input fundamental band.

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FIG. 3. Type-0 QPM SPDC spectrum pumped at 495.3 nm, 53℃ (a), and type-1 QPM SPDC spectrum pumped at 485.4 nm, 122℃ (b). Open triangles: data. Dots: QPM bands calculated based on Sellmeier equations [15] for thirty different wavelengths within the input fundamental bands. The cut-off of Si-APD starts from ~1050 nm.

TABLE 2. Parameters used in the estimation of (d33/d31)-ratio from the measured SPDC output

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TABLE 1. Parameters used in the estimation of (d33/d31)-ratio from the measured SHG output

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