山西大学物理电子工程学院，山西 太原 030006
基于包含势垒的变系数分数薛定谔方程，采用数值模拟和解析相结合的方法研究了啁啾参量和势垒函数对高斯光束传输动力学的影响。结果表明：线性啁啾会削弱分裂后其中一束子光束的强度，而二次啁啾会改变光束的呼吸幅度和宽度，使得光束不再严格按照正弦规律振荡，最终形成了一大一小的呼吸轨迹；引入势垒作用后，势垒位置处的光束由于反射与透射现象而发生变形；反射与透射的光束仍然会受到变系数的调制，并在势垒位置处叠加后再次传输。在势垒深度合适的情况下，光束遇到势垒后会被全部反射，光束的全部能量被束缚在两势垒之间，从而可在分数系统中通过势垒和啁啾参数实现对光束传输的调控与管理。
非线性光学 分数薛定谔方程 啁啾 势垒 高斯光束 光学学报
2022, 42(13): 1319001
1 宁波大学 光电子功能材料重点实验室, 宁波 315211
2 大连海事大学 物理系, 大连 116026
采用改进的坩埚下降法成功生长了Ce 3+/Yb 3+离子双掺杂LiLuF4单晶, Ce 3+的初始离子掺杂浓度为0.1mol%, Yb 3+离子浓度从0变化到2.0mol%。在波长291 nm激发时观察到Yb 3+在1020 nm( 2F5/2→ 2F7/2)附近的强近红外发射以及Ce 3+在300~350 nm(5d→4f)的紫外发射。通过吸收光谱、荧光光谱研究了Yb 3+离子掺杂浓度对Ce 3+/Yb 3+共掺杂LiLuF4单晶光谱性质的影响及Ce 3+到Yb 3+离子的能量转移机理。通过变温光谱的研究发现, 当环境温度从298 K增加到443 K时, 其荧光发射强度不断降低。Ce 3+/Yb 3+共掺杂LiLuF4单晶发光波长主要位于紫外和近红外, 这种独特的发光属性可望用于防伪技术和公共安全事务中。
Ce
3+/Yb
3+ 紫外和近红外发射 LiLuF4单晶 能量转移 Ce
3+ and Yb
3+ ultraviolet and infrared emissions LiLuF4 single crystal energy transfer
Author Affiliations
Abstract
1 Key Laboratory of Photo-Electronic Materials, Ningbo University, Ningbo 315211, China
2 College of Physics and Electronic Engineering, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China
3 Department of Physics, Dalian Maritime University, Dalian 116026, China
A 0.1 mol.% CoF2-doped Na5Lu9F32 single crystal with high quality in the size of ～ 10 mm×100 mm was grown by the Bridgman method. Three peaks located at 504, 544, and 688 nm and a broad band in the range of 1200–1600 nm centered at 1472 nm were observed in the absorption spectra. The absorption peak position suggests cobalt ions in the divalent state in the grown crystal. Moreover, the cobalt ions are confirmed to locate in the distorted cubic crystal structure. Upon excitation of 500 nm light, a sharp emission peak at 747 nm ascribed to the T22(H1)→4A2(F) transition was observed for the crystal. The Co2+-doped Na5Lu9F32 crystal shows a potentially promising material for the application of a passively Q-switched laser operating in the near-infrared range.
160.4670 Optical materials 140.3380 Laser materials Chinese Optics Letters
2018, 16(6): 061601
