GZTECH's "Photocathode-Driven Laser for High-Energy Industrial CT" Passes Scientific and Technological Achievement Evaluation

On March 26th, the Chinese Optical Society organized experts to conduct a scientific and technological achievement evaluation of the "Photocathode-Driven Laser for High-Energy Industrial CT" project of Wuhan Guangzhi Technology Co., Ltd. (hereinafter referred to as GZTECH).

The expert committee for this achievement evaluation consisted of seven experts: Academician Gu Bo of the Canadian Academy of Engineering; Professor Xiong Zhengjun of South-Central University for Nationalities; Researcher Yang Shanglu of the Shanghai Institute of Precision Optics and Mechanics, Chinese Academy of Sciences; Professor Zhao Quanzhong of Jiangnan University; Professor Liu Dun of Hubei University of Technology; Researcher Tan Yannan of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences; and Researcher Ye Mao of the Wuhan Documentation and Information Research Center, Chinese Academy of Sciences. Dr. Huang Zhihua, Chairman of GZTECH, Vice General Manager Li Chao, Dr. Tan Tianyi, R&D Manager, and other senior executives of the company attended the meeting, which was chaired by staff of the Chinese Optical Society.

After the meeting, Dr. Huang Zhihua delivered a speech, warmly welcoming the expert group and introducing the company's development history and strategic layout and progress in the field of complex laser source systems for scientific facilities, which received high recognition from the expert group. Following this, Dr. Huang Zhihua elaborated on the project background and R&D process, and invited experts to inspect the physical product of the photocathode-driven laser.

During the results presentation session, Dr. Tan Tianyi delivered a technical report to the expert panel entitled "Photocathode-Driven Laser for High-Energy Industrial CT." This project addresses the needs of national strategic sectors such as aerospace, nuclear energy, and marine engineering for high-energy industrial non-destructive testing equipment. It successfully developed a photocathode-driven picosecond deep ultraviolet laser for high-energy CT systems, addressing the technical bottleneck of traditional high-energy computed tomography (CT) resolution limited by the focal size of the thermionic electron gun. This laser has already been applied in engineering scenarios such as superconducting coil inspection in tokamak nuclear fusion devices.

Photocathode-Driven Laser

Three Core Innovations

• Three-Level Repetition Rate Adjustment Technology: Achieves wide-range, high-precision controllable adjustment of the repetition rate of high-repetition-rate mode-locked laser;

• Hybrid Active-Passive Stable Control Scheme: Achieves large bandwidth, high precision, and long-term stable control of the driven laser in the time-frequency domain;

• Novel Continuously Adjustable Fourth Harmonic Shaping Scheme: Solves the spot degradation problem caused by fourth harmonic walk-off, achieving high beam quality, high roundness, and deep ultraviolet laser shaping and transmission.

The expert group strictly followed the standards and procedures for evaluating scientific and technological achievements, completing the stages of parameter testing and review, project presentation, material review, questioning and defense, and comprehensive evaluation. The group conducted an objective and fair review from the dimensions of scientific merit, innovation, advancement, application prospects, and market value.

The evaluation committee unanimously concluded that:

The project's achievements address major national needs. The developed photocathode-driven laser is a core component of domestically produced high-energy industrial CT systems, enabling it to exceed the detection accuracy of similar American systems. It is highly innovative, independently controllable, fills a domestic gap, and its overall performance reaches international advanced levels, leading internationally in key indicators such as repetition rate and continuous operation stability.

Following the meeting, Dr. Huang Zhihua expressed his sincere gratitude to the expert group and the Chinese Optical Society for their professional guidance. GZTECH will continue to leverage its industrial laser industrialization system, focusing on national strategic fields such as aerospace, fusion energy, and quantum technology, and accelerating the research, development, and application of complex laser source systems for scientific facilities.