I. Core Technical Principles and Advantages
The core of a disk laser lies in its gain medium-a disk-shaped crystal (such as Yb:YAG) that is typically only about 0.1 millimeters thick. This extremely thin geometric structure allows heat to be rapidly conducted axially to the heat sink on the back, effectively avoiding the "thermal lensing effect" caused by uneven temperature distribution in traditional rod lasers, thereby ensuring excellent beam quality. In ultra-fast laser applications, disk lasers can perform welding, drilling, and cutting with micrometer-level precision. The minimal heat impact during processing achieves what is known as "cold processing."
II. Cutting-Edge Research and Performance Breakthroughs
In scientific research, ultra-fast disk lasers are ideal drivers for generating attosecond pulses and high-flux extreme ultraviolet (XUV) light sources. In recent years, domestic and international research teams have repeatedly set new records in increasing their average power and pulse energy. For example, some teams have achieved over 200 mJ of picosecond laser output at a 1 kHz repetition rate through innovative direct liquid cooling technology and multi-pass pump structures. Other research has set a new oscillator record of 550 watts of average power using special mirror arrays and semiconductor saturable absorber mirrors (SESAM). These high-repetition-rate, high-energy ultra-fast laser systems provide powerful light sources for cutting-edge research in attosecond physics, laser lightning rods, and surface photoelectron dynamics.
III. Core Industrial Application Scenarios
In industrial manufacturing, ultra-fast disk lasers are deeply empowering multiple strategic emerging industries:
New Energy and Automotive Manufacturing: In the electric vehicle (EV) sector, disk lasers are widely used for battery connection welding of highly reflective materials like copper and aluminum. Joint strength can reach 95% of the base material without spatter, perfectly adapting to the precision processing of liquid cooling plates and copper busbars.
Aerospace: They are used to drill cooling holes in nickel-based superalloy turbine blades, significantly improving the efficiency of aero engines and supporting the manufacturing of next-generation airframe structures.
Semiconductors and New Displays: High-power UV nanosecond disk lasers can support critical processes like laser lift-off (LLO) and excimer laser annealing (ELA), aiding the precision processing of OLED panels and semiconductor wafers. Additionally, they serve as a core alternative technology route for next-generation EUV lithography light sources.
Specialty Materials and Medical Devices: They enable highly efficient processing of carbon fiber-reinforced polymers (CFRP) with negligible thermal damage. In the medical field, they are used to manufacture coronary stents with sub-50-micron features, enhancing biocompatibility.
IV. Industrialization Process and Market Landscape
The global ultra-fast disk laser market is experiencing rapid growth and is projected to reach nearly $700 million by 2029. For a long time, core technologies in this field have been monopolized by overseas companies, such as those in Germany. However, in recent years, Chinese enterprises have accelerated their breakthroughs in this sector. Domestic companies like Suzhou Zhonghui Laser have successfully mastered the core disk laser technology and achieved industrialized mass production. They have launched kilowatt-level femtosecond lasers and high-power UV and green laser platforms. These advancements have not only achieved hundreds of millions of RMB in output value in industrial precision processing but also provided independent and controllable light source solutions for major national strategic projects like domestic EUV light sources and controlled nuclear fusion. Looking ahead, with advancements in hybridization and modular design of fiber lasers, the application threshold for disk lasers will be further lowered, ushering in broader development prospects.
