人工晶体学报2026，Vol.55Issue(7)：1100-1110,11.DOI:10.16553/j.cnki.issn1000-985x.2026.0071
Tm∶CaGdAlO4单晶光纤的生长及激光性能研究
Growth and Laser Performance of Tm∶CaGdAlO4 Single-Crystal Fiber
摘要
Abstract
In this study,a Tm3+-doped CaGdAlO4(Tm∶CALGO)disordered single-crystal fiber with a doping concentration of 4%(molar fraction)was grown by the micro-pulling-down method.The crystal structure,optical properties,continuous-wave laser performance,and passively Q-switched pulsed laser characteristics integrated with BiOX(X=Cl,Br,I)layered crystal saturable absorbers were systematically investigated.The crystal belongs to the tetragonal system with the space group I4/mmm.X-ray diffraction and Raman spectroscopy show that the as-grown crystal exhibits a pure CALGO phase with good crystallinity.The absorption spectrum reveals a main absorption peak at 793 nm with a full width at half maximum of 19.4 nm,which is attributed to the inhomogeneous broadening induced by the disordered structure.The highest phonon energy measured by Raman spectroscopy is 614 cm-1,which is lower than that of YAG crystal and beneficial for suppressing non-radiative relaxation.Fourier-transform infrared transmission spectroscopy shows that the crystal exhibits a transmittance exceeding 80%in the 2～6 µm mid-infrared region,with an infrared cut-off edge extending beyond 10 µm.In a straight cavity configuration,a maximum continuous-wave output power of 3.338 W is achieved from the Tm∶CALGO single-crystal fiber,with a slope efficiency of 27.3%and a central wavelength of 1 982.8 nm.When BiOX crystals were integrated into the laser cavity as saturable absorbers,stable passively Q-switched pulsed laser outputs were obtained under an output coupler transmittance of 5%.With BiOCl,BiOBr,and BiOI as saturable absorbers,the maximum single-pulse energies obtained are 18.564,20.335,and 17.599 µJ,the shortest pulse widths are 420,570,and 506 ns,and the highest peak powers are 44.199,35.675,and 34.781 W,respectively.This work demonstrates the excellent performance of Tm∶CALGO disordered single-crystal fibers as gain media for 2 µm lasers and provides a feasibility validation for the integration of single-crystal fibers with novel saturable absorbers.关键词
Tm∶CALGO单晶光纤/微下拉法/无序结构/2 µm/连续激光/被动调Q/卤氧化铋晶体Key words
Tm∶CALGO single-crystal fiber/micro-pulling-down method/disordered structure/2 µm/continuous-wave laser/passive Q-switching/bismuth oxyhalide crystal分类
数理科学引用本文复制引用
马晓斐,朱祥飞,张明记,高晨心,王涛,张健,贾志泰,王泽锋..Tm∶CaGdAlO4单晶光纤的生长及激光性能研究[J].人工晶体学报,2026,55(7):1100-1110,11.基金项目
国家自然科学基金(62505366) （62505366）
湖南省自然科学基金(2026JJ60212) （2026JJ60212）
新材料重大专项项目(2025ZD0617200) （2025ZD0617200）
湖南省级科技计划项目(2021RC4027) （2021RC4027）
国防科技大学创新研究项目(202402-YJRC-XX-008) （202402-YJRC-XX-008）
