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Large aperture N31 neodymium phosphate laser glass for use in a high power laser facility

  • Lili Hu, Shubin Chen, Jingping Tang, Biao Wang, Tao Meng, Wei Chen, Lei Wen, Junjiang Hu, Shunguang Li, Yongchun Xu, Yasi Jiang, Junzhou Zhang and Zhonghong Jiang...

Abstract

Large aperture Nd:phosphate laser glass is a key optical element for an inertial confinement fusion (ICF) facility. N31, one type of neodymium doped phosphate glasses, was developed for high peak power laser facility applications in China. The composition and main properties of N31 glass are given, together with those of LHG-8, LG-770, and KGSS-0180 Nd:phosphate laser glasses, from Hoya and Schott, and from Russia. The technologies of pot melting, continuous melting, and edge cladding of large size N31 phosphate laser glass are briefly described. The small signal gain profiles of N31 glass slabs from both pot melting and continuous melting at various values of the pumping energy of the xenon lamp are presented. N31 glass is characterized by a stimulated emission cross section of $3.8 \times 10^{{-20}}\ \text {cm}^{{2}}$ at 1053 nm, an absorption coefficient of 0.10–0.15%  $\text {cm}^{{-1}}$ at laser wavelength, small residual stress around the interface between the cladding glass and the laser glass, optical homogeneity of $\sim $ $\times $   $10^{{-6}}$ in a 400 mm aperture, and laser damage threshold larger than $42\ \text {J/cm}^{{2}}$ for a 3 ns pulse width at 1064 nm wavelength.

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Copyright

The online version of this article is published within an Open Access environment subject to the conditions of the Creative Commons Attribution licence .

Corresponding author

Correspondence to:  Lili Hu, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China. Email: hulili@siom.ac.cn

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