Absorption coefficient and phase matching angle of KTiOAsO4 at low temperatures in terahertz range for high efficiency terahertz generation

Li, Gaofang; Ye, Hanjing; Huang, Jingguo; Cui, Haoyang; Xia, Nenghong; Gao, Yanqing; Huang, Zhiming; Chu, Junhao; Andreev, Yury

doi:10.1016/j.infrared.2024.105238

Infrared Physics & Technology

2024

DOI: 10.1016/j.infrared.2024.105238

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Absorption coefficient and phase matching angle of KTiOAsO4 at low temperatures in terahertz range for high efficiency terahertz generation

Gaofang Li,

Hanjing Ye,

Jingguo Huang

et al.

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Cited by 2 publications

References 26 publications

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Neutral donors confined in semiconductor coupled quantum dot-rings: Position-dependent properties and optical transparency phenomenon

Hernández,

López-Doria,

Suaza

et al. 2025

Physica E: Low-dimensional Systems and Nanostructures

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Neutral donors confined in semiconductor coupled quantum dot-rings: Position-dependent properties and optical transparency phenomenon

Hernández,

López-Doria,

Suaza

et al. 2025

Physica E: Low-dimensional Systems and Nanostructures

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Optical properties and phase matching conditions of KTiOPO₄ crystals at terahertz frequencies in the temperature range of 5.8 to 300 K

Li,

Liu,

et al. 2024

Appl. Opt.

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In this paper, the optical properties and phase matching (PM) conditions of KTiOPO4 (KTP) crystals in the temperature range of 5.8–300 K are studied by terahertz (THz) time-domain spectroscopy. It is found that the absorption coefficient of KTP decreases with the decrease of temperature, and that of the Z axis at 1.2 THz decreases from 19.56cm−1 at 300 K to 7.83cm−1 at 5.8 K. Along the Z axis, the refractive index decreases with the decrease of temperature and changes the most, while along the X and Y axes the refractive index is relatively stable with temperature. The optical properties along the Z axis are sensitive to temperature, mainly because the movement of K+ is located in the Z axis and slows down with the decrease of temperature. KTP crystals are found to have obvious birefringence characteristics in the frequency range of 0.3–1.6 THz, with the birefringence of approximately 0.67 at 300 K and 0.58 at 5.8 K. The PM angle is calculated using the refractive index dispersion equation to satisfy the PM condition of frequency transformation. When the temperature is lowered from 300 K to 5.8 K, the maximum change in PM angle is 1.08°, while the minimum change is 0.10° at the same output wavelength. Due to the small absorption coefficient and the birefringence characteristics at low temperatures, and the relatively stable change of PM angle with temperature, the potential of KTP crystals to efficiently generate THz radiation at low temperatures can be fully realized.

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Absorption coefficient and phase matching angle of KTiOAsO4 at low temperatures in terahertz range for high efficiency terahertz generation

Cited by 2 publications

References 26 publications

Neutral donors confined in semiconductor coupled quantum dot-rings: Position-dependent properties and optical transparency phenomenon

Neutral donors confined in semiconductor coupled quantum dot-rings: Position-dependent properties and optical transparency phenomenon

Optical properties and phase matching conditions of KTiOPO₄ crystals at terahertz frequencies in the temperature range of 5.8 to 300 K

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Absorption coefficient and phase matching angle of KTiOAsO4 at low temperatures in terahertz range for high efficiency terahertz generation

Cited by 2 publications

References 26 publications

Neutral donors confined in semiconductor coupled quantum dot-rings: Position-dependent properties and optical transparency phenomenon

Neutral donors confined in semiconductor coupled quantum dot-rings: Position-dependent properties and optical transparency phenomenon

Optical properties and phase matching conditions of KTiOPO4 crystals at terahertz frequencies in the temperature range of 5.8 to 300 K

Contact Info

Product

Resources

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Optical properties and phase matching conditions of KTiOPO₄ crystals at terahertz frequencies in the temperature range of 5.8 to 300 K