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.
Funding Information
  • National Basic Research Program of China (2016YFB1102201, 2018YFB0406502)
  • Key Technology Research and Development Program of Shandong Province (2018CXGC0410, 2017GGX20116, 2018JMRH0207)
  • Shandong University (2015WLJH36)
  • Natural Science Foundation of Shandong Province (ZR2018PEM007)
  • Higher Education Discipline Innovation Project (BP2018013)

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