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Crystals 2018, 8(8), 322; https://doi.org/10.3390/cryst8080322

Photorefractive Properties of Molybdenum and Hafnium Co-Doped LiNbO3 Crystals

1
School of Physics, Nankai University, Tianjin 300071, China
2
The MOE Key Laboratory of Weak-Light Nonlinear Photonics and TEDA Institute of Applied Physics, Nankai University, Tianjin 300457, China
*
Authors to whom correspondence should be addressed.
Received: 10 July 2018 / Revised: 8 August 2018 / Accepted: 10 August 2018 / Published: 13 August 2018
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Abstract

A series of LiNbO3: Mo, Hf crystals with 0.5 mol % fixed MoO3 and various HfO2 concentrations (0.0, 2.0, and 3.5 mol %) were grown by the Czochralski technique. The photorefractive properties of the LiNbO3: Mo, Hf crystals were investigated by two-wave coupling measurements and the beam distortion method was employed to obtain the optical damage resistance ability. The UV-visible and OH absorption spectra were also studied. The experimental results imply that the photorefractive properties of LiNbO3: Mo crystals at laser wavelengths of 532, 488, and 442 nm can be greatly enhanced by doping HfO2 over the threshold concentration. At 442 nm especially, the response time of LN: Mo, Hf3.5 can be shortened to 0.9 s with a diffraction efficiency of 46.07% and a photorefractive sensitivity reaching 6.28 cm/J. Besides this, the optical damage resistance at 532 nm is 3 orders of magnitude higher than that of the mono-doped LiNbO3: Mo crystal, which is beneficial for applying it in the field of high-intensity lasers. View Full-Text
Keywords: LiNbO3 crystal; molybdenum and hafnium co-doping; photorefractive properties LiNbO3 crystal; molybdenum and hafnium co-doping; photorefractive properties
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Zhu, L.; Zheng, D.; Saeed, S.; Wang, S.; Liu, H.; Kong, Y.; Liu, S.; Chen, S.; Zhang, L.; Xu, J. Photorefractive Properties of Molybdenum and Hafnium Co-Doped LiNbO3 Crystals. Crystals 2018, 8, 322.

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