Photorefractive Properties of Molybdenum and Hafnium Co-Doped LiNbO3 Crystals

Crystals

Yongfa Kong¹  Hongde Liu¹  Ling Zhu¹  Jingjun Xu¹  Shiguo Liu¹  Shahzad Saeed¹  Shuolin Wang¹  Ling Zhang²  Dahuai Zheng²  Shaolin Chen² 

[1] School of Physics, Nankai University, Tianjin 300071, China;The MOE Key Laboratory of Weak-Light Nonlinear Photonics and TEDA Institute of Applied Physics, Nankai University, Tianjin 300457, China;

关键词: LiNbO3 crystal;    molybdenum and hafnium co-doping;    photorefractive properties;   

DOI  :  10.3390/cryst8080322

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown