Growth, structural, spectral and high-power continuous-wave laser operation of Yb0.11Gd0.89COB crystal

A Yb_（0.11）Gd_（0.89）Ca_4O（BO_3）_3 crystal with new composition was grown by the Czochralski method. The crystal structure was measured and analyzed. The unit-cell parameters of the Yb_（0.11）Gd_（0.89）COB were calculated to be a=0.8089（7） nm, b=1.5987（6） nm, c=0.3545（8） nm, β=101.22o. The absorption a...

Full description

Saved in:
Bibliographic Details
Published inJournal of rare earths Vol. 35; no. 7; pp. 637 - 644
Main Author 钟德高 滕冰 孔伟金 薛冬峰 孙丛婷 李建宏 景贺琳 贺杰 徐雅琳 杨亮 唐捷
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.2017
Subjects
crystal structure
defects
optical materials
optical properties
rare earths
大功率
提拉法生长
晶体结构
晶体缺陷
最大输出功率
激光手术
荧光光谱
连续波
crystal structure
optical properties
optical materials
defects
rare earths
Online AccessGet full text
ISSN1002-0721
2509-4963
DOI10.1016/S1002-0721(17)60957-8

Cover

More Information
Summary:A Yb_（0.11）Gd_（0.89）Ca_4O（BO_3）_3 crystal with new composition was grown by the Czochralski method. The crystal structure was measured and analyzed. The unit-cell parameters of the Yb_（0.11）Gd_（0.89）COB were calculated to be a=0.8089（7） nm, b=1.5987（6） nm, c=0.3545（8） nm, β=101.22o. The absorption and fluorescence spectra were measured. The maximum absorption cross-section of Yb_（0.11）Gd_（0.89） COB crystal was 0.79×10~（–20）cm~2, which occurred at 976 nm with Y polarization. The emission cross-section at 1027 nm was calculated to be 0.33×10~（–20） cm~2. The radiative lifetime trad was calculated to be 2.74 ms. The Stark energy-level diagram of Yb~（3＋）in the Yb_（0.11）Gd_（0.89）COB crystal field at room temperature was determined. The ground-state energy level ~2F_（7/2） splitting was calculated to be as large as 1004 cm~（–1） and the zero-line energy was 10246 cm~（–1）. A maximum output power of 9.35 W was achieved in continuous-wave（CW） mode, with the slope efficiency being 42.1%. Chemical etching experiment revealed that the dominating imperfections in the studied Yb_（0.11）Gd_（0.89） COB crystal were dislocations and sub-grain boundaries. The existence of crystal defects could cause light scattering, and degrade laser output efficiency. The influence of crystal defects on laser properties was discussed.
Bibliography:11-2788/TF
optical materials rare earths optical properties crystal structure defects
A Yb_（0.11）Gd_（0.89）Ca_4O（BO_3）_3 crystal with new composition was grown by the Czochralski method. The crystal structure was measured and analyzed. The unit-cell parameters of the Yb_（0.11）Gd_（0.89）COB were calculated to be a=0.8089（7） nm, b=1.5987（6） nm, c=0.3545（8） nm, β=101.22o. The absorption and fluorescence spectra were measured. The maximum absorption cross-section of Yb_（0.11）Gd_（0.89） COB crystal was 0.79×10~（–20）cm~2, which occurred at 976 nm with Y polarization. The emission cross-section at 1027 nm was calculated to be 0.33×10~（–20） cm~2. The radiative lifetime trad was calculated to be 2.74 ms. The Stark energy-level diagram of Yb~（3＋）in the Yb_（0.11）Gd_（0.89）COB crystal field at room temperature was determined. The ground-state energy level ~2F_（7/2） splitting was calculated to be as large as 1004 cm~（–1） and the zero-line energy was 10246 cm~（–1）. A maximum output power of 9.35 W was achieved in continuous-wave（CW） mode, with the slope efficiency being 42.1%. Chemical etching experiment revealed that the dominating imperfections in the studied Yb_（0.11）Gd_（0.89） COB crystal were dislocations and sub-grain boundaries. The existence of crystal defects could cause light scattering, and degrade laser output efficiency. The influence of crystal defects on laser properties was discussed.
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(17)60957-8