One-order-higher Cr4+ conversion efficiency in Cr4+:YAG transparent ceramics for a high-frequency passively Q-switched laser

Yingshuang Shan; Le Zhang; Tianyuan Zhou; Cen Shao; Lei Zhang; Yuelong Ma; Qing Yao; Zhigang Jiang; Farida A. Selim; Hao Chen

doi:doi:10.1364/PRJ.7.000933

Photonics Research, 2019, 7 (8): 08000933, Published Online: Jul. 29, 2019

One-order-higher Cr⁴⁺ conversion efficiency in Cr⁴⁺:YAG transparent ceramics for a high-frequency passively Q-switched laser Download： 638次

Yingshuang Shan ¹Le Zhang ^1,2,3,6,*Tianyuan Zhou ^1,2Cen Shao ¹Lei Zhang ⁴Yuelong Ma ^1,5Qing Yao ^1,5Zhigang Jiang ^1,5Farida A. Selim ²Hao Chen ^1,7,*

Author Affiliations

¹ Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China

² Department of Physics and Astronomy, Bowling Green State University, Bowling Green, Kentucky 43403, USA

³ School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA

⁴ SUSTech Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China

⁵ School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China

⁶ e-mail: njutzl@163.com

⁷ e-mail: chenhao@jsnu.edu.cn

Abstract

The

{Cr}^{4 +}

-doped yttrium aluminum garnet (

{Cr}^{4 +} : YAG

) saturable absorber, a new generation of passively

Q

-switched solid-state laser material, faces a significant obstacle of low conversion rate of chromium from trivalent to tetravalent, degrading efficiency in a passively

Q

-switched laser. In this paper, highly transparent

{Cr}^{4 +} : YAG

ceramics were fabricated and committed to compare the laser performance with

{Cr}^{4 +} : YAG

crystals on a 1 μm passively

Q

-switched laser. Thanks to the grain boundary effect, the

{Cr}^{4 +}

conversion efficiency of 0.05 at.%

{Cr}^{4 +} : YAG

transparent ceramics coated with high transparency (HT) films (

T = 86.46 %

at 1064 nm) was nine times higher than that of 0.1 at.%

{Cr}^{4 +} : YAG

single crystals coated with HT films (

T = 84.00 %

at 1064 nm). Differing from the counterpart

{Cr}^{4 +} : YAG

crystals, no absorption saturation tendency was observed for the 0.05 at.% Cr:YAG ceramics when the pump power exceeded

～ 1900 mW

. Furthermore, the repetition frequency reached 217 kHz for 0.05 at.% Cr:YAG ceramics, which was a three-fold factor increase from that of the corresponding single crystal. The advantages of transparent ceramics over single crystals were proved through laser performance for the first time, to the best of our knowledge. This study also provided compelling evidence for replacing single crystals with ceramics for u

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Yingshuang Shan, Le Zhang, Tianyuan Zhou, Cen Shao, Lei Zhang, Yuelong Ma, Qing Yao, Zhigang Jiang, Farida A. Selim, Hao Chen. One-order-higher Cr⁴⁺ conversion efficiency in Cr⁴⁺:YAG transparent ceramics for a high-frequency passively Q-switched laser[J]. Photonics Research, 2019, 7(8): 08000933.

One-order-higher Cr⁴⁺ conversion efficiency in Cr⁴⁺:YAG transparent ceramics for a high-frequency passively Q-switched laser Download： 638次

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