Recently,the Institute of Physical and Chemical Technology,Chinese Academy of Sciences (hereinafter referred to as “Institute of Physical and Chemical Technology”) in Optics Letters (volume 49,No.16,p.4669) and IEEE Photonics Technology Letters (2025,early access) was published on “Harmonic Coaxial Collimator” ( harmonic beam coaxial combination,HBCC) Breakthrough research results in technology.The Anhui Huachuang Hongdu Photoelectric Technology Co., Ltd. (hereinafter referred to as ” Huachuang Hongdu “),as a cooperation uni,provided the core light source and technical support for this research,and jointly verified the feasibility and superiority of this new method of laser beam combining.
The related outcome paper is addressed below and can be copied and linked to a browser to read.
https://doi.org/10.1364/OL.531047
https://doi.org/10.1109/LPT.2025.3620031
This technology has successfully solved the long-standing problem in the field of high-power laser” Power enhancement” and to “beam quality maintenance” difficult to balance the bottleneck problem ,opens up a new path for industrial lasers to higher power.
In this study,Huachuang Hongdu provided two independently developed high-performance 1064nm picosecond lasers as the core light source.
Each laser has excellent performance parameters:pulse width of 10ps,repetition rate of 400kHz,beam quality M²<1.2,average power of about 112W,and a high-precision LBO nonlinear crystal.
△High-power Piesecond Laser Harmonic Coaxial Beam Experimental Device
These devices provide an important guarantee for the smooth progress of the experiment,ensuring the efficient and stable process of beam combination.In addition,Huahua Hongdu’s technical team actively cooperated,participated in the design of the optical path and system optimization,and provided strong support for the key indicators of the experiment.
The power increase of industrial lasers has long been limited by the thermal effect of the gain medium, and traditional beams technologies have obvious limitations:coherent beams require precision phase control,and the system is complex.Spectroscopic beam requires different wavelengths for each of the sublaser beams;Polarized beams usually only combine two beams of lasers and are insufficiently extensible.
In response to these challenges,physics and chemistry proposes a new technique for harmonic coaxial convergence based on the non-reversal principle of the multifrequency process:when a base-frequency laser produces multifrequency light through a nonlinear crystal at a specific power density,the multifrequency light can be reversely passed through the same crystal nearly without loss.
Using this property,multi-beam fundamental frequency laser can be added step by step coaxially to achieve power synthesis and keep the beam quality unchanged.Compared with the traditional wavelength coupling method,this new wavelength conversion technology It shows a significant advantage:not only does it not need to be equipped with different wavelength lasers,but also significantly reduces the precision requirements for optical components such as mirrors,effectively simplifying the system structure.In addition,in the experiment,the precise adjustment of the pulse sequence was used to The design idea of avoiding interference also provides important reference value for similar research.
△ Demonstration of the Principle of Laser Harmonic Coaxial Befitting
The solution boosts average power while ensuring excellent beam quality for higher efficiency and precision machining in industrial applications,which is the core value.
Based on the laser exciter provided by Huachuang Hongdu and the combined optical path designed by Li Chem,two 1064nm picosecond laser beams were successfully synthesized into a 532nm laser after frequency doubling.
△ Demonstration of a High-power Piesecond Harmonic Coaxial Beam Light Path
Measured data show that:After the beam combination,the power reaches 132W,the efficiency is as high as 99.9%,and the laser still maintains the high beam quality of M2 ≈ 1.25,and the linear polarization degree is kept at more than 140:1.
This result fully validates the significant advantages of the harmonic coaxial binding method in terms of ease of operation,efficiency and scalability.The quality of the laser beams after the carriage is maintained to be excellent,providing a reliable guarantee for industrial applications.
△ The Laser Beam Maintains Good Beam Quality After Harmonic Coaxial Combining
The beam method significantly reduces the complexity of system thermal management by transferring the high thermal load generated by laser gain media to nonlinear crystals with very low absorption rates (e.g. LBO crystals with an absorption rate of only tens of ppm).It is not only suitable for multi-frequency laser power synthesis,but also for three-frequency and harmonic laser power synthesis.No matter what technical solution is used to obtain high-performance sub- laser beams,this method can be used to achieve an increase in the order of power of harmonic laser output.
Thanks to this,industrial-grade ultrafast green/UV lasers are expected to achieve a breakthrough in output power while maintaining excellent beam quality.Based on this technology breakthrough,the laser has shown a broad application prospect in many fields such as semiconductor and photovoltaic manufacturing,and will play an irreplaceable role with its significant output power advantage.
We believe this technological breakthrough is just the beginning.harmonic coaxial befitting technology goes beyond the thinking limits of traditional befitting methods-although pulse stacking is not yet possible,by using nonlinear crystals as befitting devices at the same time,it has opened up a whole new technological path for high-power ultrafast lasers.
This joint experiment not only verified the feasibility of the new technology,but also confirmed the leading strength of Huahua Hongdu in the field of high-end core light source.As a national-level “Specialized,Refined,Unique and Innovative” (SRUI) “Little Giant” and high-tech enterprise,the company has established a closed-loop system of “scientific research breakthroughs-technology transfer”.It has successively undertaken multiple major scientific research tasks such as the “National Key Research and Development Program” and the “Anhui Province Science and Technology Innovation Breakthrough Project”, and has been officially certified as the “Anhui Provincial Enterprise Research and Development Center”.Recently,it has been further recognized for its innovative vitality and growth potential as the “Golden Phoenix” enterprise for the transformation of scientific and technological achievements in Hefei.
In the future,we will continue to deepen the two-wheel drive of “research and industry,”relying on deep patent accumulation and research and development.We will strive to create a virtuous circle of “breakthrough,upgrade and empowerment,” accelerate the independent iteration of industrial-grade lasers,continue to inject innovation kinetic energy into the application industry of high-end laser technology,and promote the high-quality development of China from a “laser major” to a “laser power.”
