Chinese Journal of Lasers (ISSN 0258-7025), which is regarded as a flagship journal in China, reports on current and influential research in the field of lasers. Founded in 1974, the journal is administrated by the Chinese Academy of Sciences (CAS), is sponsored by the Shanghai Institute of Optics and Fine Mechanics, CAS, and the Chinese Optical Society, and is published by the Chinese Laser Press. The featured columns of Chinese Journal of Lasers include laser physics, laser manufacturing, materials and thin films, measurement and metrology, beam transmission and control, optical communications, biomedical photonics and laser medicine, nonlinear optics, holography and information processing, remote sensing and sensors, spectroscopy, quantum optics, micro and nano optics, terahertz technology, rapid communications, etc. The special issue is a feature of the Chinese Journal of Lasers. There were two special issues in 2019.