Li Jianfeng, Luo Hongyu, Wang Lele, Liu Yong, Yan Zhijun, Zhou Kaiming, Zhang Lin, Turistsyn Sergei K
1] State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China [2] Institute of Photonic and Technology (AIPT), Aston University, Birmingham, UK [3] Jiangsu Key Laboratory of Medical Optics, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China.
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China.
Sci Rep. 2015 Jun 4;5:10770. doi: 10.1038/srep10770.
Cascade transitions of rare earth ions involved in infrared host fiber provide the potential to generate dual or multiple wavelength lasing at mid-infrared region. In addition, the fast development of saturable absorber (SA) towards the long wavelengths motivates the realization of passively switched mid-infrared pulsed lasers. In this work, by combing the above two techniques, a new phenomenon of passively Q-switched ~3 μm and gain-switched ~2 μm pulses in a shared cavity was demonstrated with a Ho(3+)-doped fluoride fiber and a specifically designed semiconductor saturable absorber (SESAM) as the SA. The repetition rate of ~2 μm pulses can be tuned between half and same as that of ~3 μm pulses by changing the pump power. The proposed method here will add new capabilities and more flexibility for generating mid-infrared multiple wavelength pulses simultaneously that has important potential applications for laser surgery, material processing, laser radar, and free-space communications, and other areas.
红外基质光纤中稀土离子的级联跃迁为在中红外区域产生双波长或多波长激光提供了潜力。此外，可饱和吸收体（SA）在长波长方向的快速发展推动了被动调Q中红外脉冲激光器的实现。在这项工作中，通过结合上述两种技术，利用掺Ho(3+)氟化物光纤和专门设计的半导体可饱和吸收镜（SESAM）作为SA，在共享腔内展示了被动调Q的3μm脉冲和增益开关的2μm脉冲这一新现象。通过改变泵浦功率，2μm脉冲的重复频率可以在3μm脉冲重复频率的一半到相同之间进行调谐。本文提出的方法将为同时产生中红外多波长脉冲增加新的能力和更大的灵活性，这在激光手术、材料加工、激光雷达和自由空间通信等领域具有重要的潜在应用。
