Brighter, bolder, world-record-breaking laser signals a paradigm shift

Oct. 19, 2023
A new green laser based on coherent beam combining brings more to the table than its traditional counterparts.

A team from Civan Lasers (Jerusalem, Israel)—in conjunction with the Fraunhofer Institute for Material and Beam Technology (Fraunhofer IWS; Dresden, Germany), Siemens (Munich, Germany), and ThyssenKrupp (Essen, Germany)—has developed a 500 W, single-mode, continuous-wave (CW) 532 nm green laser that represents a significant advancement in the field. Its beam quality and power just broke the world record for this type of laser (see figure and video).

“This isn’t just an advancement, it’s a paradigm shift,” says Yaniv Vidne, vice president of R&D at Civan Lasers.

The laser relies on coherent beam combining, which involves several high-power laser beams essentially funneled into a single coherent beam that puts out correspondingly higher power and preserves spectral bandwidth. Beam brightness is significantly increased in the process. A distinguishing feature in Civan’s laser, according to Vidne, is its “exceptional beam quality.”

“Coherent beam combining is to laser technology what the microprocessor was to computing,” Vidne says. “It’s not just about increasing power; it’s about refining how we approach laser design.”

The laser eliminates any risk to the integrity of a single crystal—a common component. Conventional lasers are known to compromise their systems’ longevity by sometimes pushing too much power through a single crystal channel.

EUREKA, CBC-GREEN, and the future

The record-breaking green laser was developed as part of the EUREKA project—a collaborative group that funds research and development ventures for companies, research organizations, and universities—specifically, its CBC-GREEN initiative. Beyond developing the 532 nm CW laser, the initiative’s goal includes integrating more flexible and efficient processing of copper materials.

Because of their strong electrical and thermal properties, copper materials are crucial to fabricating energy storage systems, power electronics, control systems, and cooling structures. However, processing copper using existing laser methods is limited because those techniques produce a high degree of reflection.

The green laser presents a better approach because it simultaneously allows high power and high beam quality. “This laser holds immense potential,” Vidne says. “The horizon for this technology is vast.”

Along with metal additive manufacturing of copper, the laser shows promise for applications including welding reflective materials such as copper and semiconductor welding—notably, chip-to-wafer welding as an alternative to traditional wire-bonding processes.

As part of the project, the researchers are now investigating the systems engineering development approach of coupling frequency-doubled, single-mode-infrared laser modules with coherent beam combining. This method would enable high CW power in laser machining processes for the first time.

“By combining power and modulation capabilities,” Vidne says, “we’re envisioning a future where this laser replaces traditional non-laser joining methods.”

About the Author

Justine Murphy | Multimedia Director, Laser & Military

Justine Murphy is the multimedia director for the Laser & Military Group at Endeavor Business Media. In addition to Laser Focus World, the group includes Military & Aerospace Electronics and Vision Systems Design. She is a multiple award-winning writer and editor with more 20 years of experience in newspaper publishing as well as public relations, marketing, and communications. For nearly 10 years, she has covered all facets of the optics and photonics industry as an editor, writer, web news anchor, and podcast host for an internationally reaching magazine publishing company. Her work has earned accolades from the New England Press Association as well as the SIIA/Jesse H. Neal Awards. She received a B.A. from the Massachusetts College of Liberal Arts.

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