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Nd doped CaYAl3O7: exploration and laser performance of a novel disordered laser crystal

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Abstract

A novel disordered structure crystal has drawn intense interest as a promising ultrafast laser crystal host for its broad absorption and emission bands. Herein, a novel disordered crystal of Nd3+-doped CaYAl3O7 (CYAM) was successfully grown using the Czochralski method for the first time. The effective segregation coefficient of Nd3+ ions in CaYAl3O7 was calculated to be 0.76. To better understand the intrinsic optical properties, the transmission spectra and refractive index of pure CaYAl3O7 were measured. A systematic investigation of the crystal structure characteristics, fluorescence lifetime, and polarized absorption and emission cross-sections of the Nd:CYAM crystal at RT was reported. The maximal absorption cross-sections are 3.51 and 5.34 × 10−20 cm2 for π-polarization and σ-polarization, with a FWHM of 18 nm. The emission cross-sections of π- and σ-polarization are 5.97 and 4.55 × 10−20 cm2 with FWHM values of 14 and 14.4 nm, respectively. The results show that the Nd:CYAM crystal has broad, strong absorption and emission cross-sections. In particular, effective continuous-wave laser operation was realized with this crystal in the a-cut sample for the first time. A maximum output power of 714 mW was achieved, corresponding to an optical-to-optical conversion efficiency of 7.14% and a slope efficiency of 8.6%. Collectively, these results show that the Nd:CaYAl3O7 crystal is a promising disordered laser host.

Graphical abstract: Nd doped CaYAl3O7: exploration and laser performance of a novel disordered laser crystal

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Article information


Submitted
18 May 2020
Accepted
11 Jun 2020
First published
15 Jun 2020

CrystEngComm, 2020, Advance Article
Article type
Paper

Nd doped CaYAl3O7: exploration and laser performance of a novel disordered laser crystal

Y. Li, Z. Jia, H. Nie, Y. Yin, X. Fu, W. Mu, J. Zhang, B. Zhang, S. Li and X. Tao, CrystEngComm, 2020, Advance Article , DOI: 10.1039/D0CE00730G

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