Wavelength-tunable Hermite-Gaussian modes and an orbital-angular-momentum-tunable vortex beam in a dual-off-axis pumped Yb:CALGO laser

被引：91
|
作者：
Shen, Yijie [1 ]
Meng, Yuan [1 ]
Fu, Xing [1 ]
Gong, Mali [1 ]
机构：
[1] Tsinghua Univ, Dept Precis Instruments, State Key Lab Precis Measurement Technol & Instru, Beijing 100084, Peoples R China
来源：
OPTICS LETTERS | 2018年 / 43卷 / 02期
关键词：
BROAD-BAND; GENERATION; CRYSTALS; DIODE; LIGHT;
D O I：
10.1364/OL.43.000291
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A dual-off-axis pumping scheme is presented to generate wavelength-tunable high-order Hermite-Gaussian (HG) modes in Yb:CaGdAlO4 lasers. The mode and wavelength can be actively controlled by the off-axis displacements and pump power. The purities of the output HG modes are quantified by intensity distributions and the measured M-2 values. The highest order reaches m = 15 for stable HG(m,0) mode, and wavelength-tunable width is about 10 nm. Moreover, through externally converting the HG(m,0) modes, the vortex beams carrying orbital angular momentum (OAM) with a large OAM-tunable range from +/- 1h to +/- 15h are produced. This work is effective for largely scaling the spectral and OAM tunable ranges of optical vortex beams. (c) 2018 Optical Society of America
引用
收藏
页码：291 / 294
页数：4
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