Direct generation of an ultrafast vortex beam in a CVD-graphene-based passively mode-locked Pr:LiYFvisible laser

被引：0

作者：

NAN LI ^{[1
]}

JUNJIE HUANG ^{[2
]}

BIN XU ^{[1
,3
]}

YAQI CAI ^{[1
]}

JIE LU ^{[2
]}

LINJIE ZHAN ^{[2
]}

ZHENGQIAN LUO ^{[1
]}

HUIYING XU ^{[1
]}

ZHIPING CAI ^{[1
]}

WEIWEI CAI ^{[2
]}

机构：

[1] Department of Electronic Engineering, Xiamen University

[2] Department of Physics, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University

[3] Shenzhen Research Institute of Xiamen

来源：

Photonics Research | 2019年 / 11期

关键词：

D O I：

暂无

中图分类号：

TQ127.11 []; TN24 [激光技术、微波激射技术];

学科分类号：

摘要：

We report on the direct generation of passively mode-locked vortex lasers in the visible spectral region, for the first time to the best of our knowledge, using a Pr :Li YF4(Pr:YLF) crystal as the gain medium. A stable mode-locked TEM00 mode has been achieved with a maximum average output power of 75 m W using a graphene saturable absorber mirror. The mode-locked pulse width is measured to be as short as about 73.4 ps at a repetition rate of about 140 MHz, and the laser wavelength is at about 721 nm with spectral width of about 0.5 nm. By slightly misaligning the laser resonator, a first-order Laguerre-Gaussian mode(LG0,1) has also been obtained with output power reduced to about 22 m W. The achieved LG0,1 mode has been verified via a home made improved Fizeau interferometer. This work provides a simple and universal method for direct generation of an ultrafast vortex laser,which can be readily extended to other spectral regions by using different laser gain mediums.

引用

页码：1209 / 1213

页数：5

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