Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Investigation of Stimulated Polariton Scattering from the B1-symmetry Modes of the KNbO3 Crystal

  • Li, Zhongyang (College of Electric Power, North China University of Water Resources and Electric Power) ;
  • Wang, Mengtao (College of Electric Power, North China University of Water Resources and Electric Power) ;
  • Wang, Silei (College of Electric Power, North China University of Water Resources and Electric Power) ;
  • Yuan, Bin (College of Electric Power, North China University of Water Resources and Electric Power) ;
  • Bing, Pibin (College of Electric Power, North China University of Water Resources and Electric Power) ;
  • Xu, Degang (College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics, Tianjin University) ;
  • Yao, Jianquan (College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics, Tianjin University)
  • Received : 2017.06.12
  • Accepted : 2017.12.12
  • Published : 2018.02.25
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Abstract

Stimulated polariton scattering from the $B_1$-symmetry modes of a $KNbO_3$ crystal to generate a terahertz wave (THz-wave) with a noncollinear phase-matching scheme is investigated. The frequency-tuning characteristics of the THz-wave by varying the phase-matching angle and pump wavelength are analyzed. The expression for the effective parametric gain length under the noncollinear phase-matching condition is deduced. Parametric gain and absorption characteristics of the THz-wave in $KNbO_3$ are theoretically simulated. The characteristics of $KNbO_3$ for a terahertz parametric oscillator (TPO) are compared to those of $MgO:LiNbO_3$. The analysis indicates that $KNbO_3$ is an excellent optical crystal for a TPO, to enhance the THz-wave output.

Keywords

KGHHD@_2018_v2n1_90_f0001.png 이미지

FIG. 1. Schematic diagram of a surface-emitting TPO using KNbO3 with a noncollinear phase-matching scheme.

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FIG. 2. Dispersion curve for the B1-symmetry polariton modes in KNbO3 and the phase-matching curves for the 1064-nm pump laser.

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FIG. 3. Dispersion curve for the B1-symmetry polariton modes in KNbO3 and the phase-matching curves, at room temperature and a fixed phase-matching angle θ of 1°.

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FIG. 4. Effective parametric gain length versus pump wavelength, assuming the physical length of the resonant cavity is 80 mm, l is 60 mm, and wp is 1 mm.

KGHHD@_2018_v2n1_90_f0005.png 이미지

FIG. 5. Effective parametric gain length versus the radius of the pump wave, assuming the physical length of the resonant cavity is 80 mm, l is 60 mm, and p λ is 1064 nm.

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FIG. 6. Effective parametric gain length versus crystal length, assuming the physical length of the resonant cavity is 80 mm, wp is 1 mm, and p λ is 1064 nm.

KGHHD@_2018_v2n1_90_f0007.png 이미지

FIG. 7. THz-wave parametric gain coefficient gT and absorption coefficient T α for KNbO3 and MgO:LiNbO3 at room temperature( p λ = 633 nm, Ip = 100 MW/cm2): (a) gain coefficient gT, (b) absorption coefficient Tα .

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