Wu Qian, Gao Zeliang, Wu Zhixin, Li Conggang, Tian Xiangxin, Zhao Peng, Wang Zhengping, Sun Youxuan, Xia Shengqing, Tao Xutang
Opt Lett. 2020 Sep 15;45(18):5061-5064. doi: 10.1364/OL.403417.
A new generation of orthogonally polarized dual-wavelength lasers was demonstrated using a dye mode-locked neodymium-doped yttrium aluminum garnet laser for the first time. With a hexagonal as the Raman medium, efficient dual-wavelength stimulated Raman scattering was obtained at 1175 and 1154 nm with similar output power, corresponding to the stretching vibration of Mo-O and the asymmetric stretching vibrations of Mo-O and Te-O groups, respectively. The power ratio of two Raman components can be flexibly adjusted by tuning the polarization of the incident laser, which can be tuned from 0% to 100%. Laser sources with such a small wavelength separation could prove interesting for the difference-frequency generation of terahertz waves in the 4.6 THz range. Our study provides a simple and flexible method to achieve a promising dual-wavelength laser source in orthogonal polarization by Raman-based nonlinear frequency conversions.
首次使用染料锁模掺钕钇铝石榴石激光器展示了新一代正交偏振双波长激光器。以六方晶 作为拉曼介质，在1175和1154 nm处获得了具有相似输出功率的高效双波长受激拉曼散射，分别对应于Mo-O的拉伸振动以及Mo-O和Te-O基团的不对称拉伸振动。通过调整入射激光的偏振，可以灵活调节两个拉曼分量的功率比，其可在0%至100%之间调节。如此小波长间隔的激光源对于产生4.6太赫兹范围内的太赫兹波的差频产生可能很有意义。我们的研究提供了一种简单灵活的方法，通过基于拉曼的非线性频率转换来实现具有正交偏振的有前景的双波长激光源。
