Chapter 877 Key Technology: Ultrashort Laser Processing

Time passes day by day.

After returning to work during the Spring Festival, before most people’s holiday syndrome was completely eliminated, a shocking news suddenly came out in the field of composite materials——

A research team from China published a paper in the Nature journal. Based on the Boltzmann transport equation and lattice dynamics theory, they proposed an instantaneous laser-material interaction mechanism that is different from the traditional two-temperature model. The state thermoelastic model almost completely fits the processing of large-thickness CFRP plates by continuous laser sources.

Even more coincidentally, the corresponding author of this paper is Chang Haonan, who participated in proving the Poincaré conjecture last year, but then almost disappeared.

No one has heard of the first author in the past, but I think he should be a student in Chang Haonan’s research group.

Obviously, he has not been living in seclusion for more than half a year.

Instead, he focused his energy on guiding students.

Or cross-border guidance.

He also directed a Nature article...

Chun Chun is no longer a human being.

Therefore, whether it is for research purposes, out of curiosity, or simply to join in the fun of "a Chinese scholar published Nature".

In short, the popularity of this article was frighteningly high.

After the paper was officially accepted, Chang Haonan has been paying attention to research in related fields.

Especially arXiv.

As a preprint site, most of the papers that appear on it are actually of little value in themselves.

However, the amount of content published on it within a period of time is a small window to see the big.

In the next week, the number of new entries related to composite materials processing surged by nearly 15%...

It can only be said that never doubt the sense of smell of materials researchers chasing hot spots.

And this is exactly what Chang Haonan wants to see.

Amidst the high degree of enthusiasm, some research groups, even if their own research direction is ultra-short pulse laser, will most likely allocate some efforts to explore the direction of traditional continuous laser processing.

Or at least repeat the experiments in his paper.

And if a Nature article is not enough...

He also followed up with a combination of punches.

So, as soon as the Lantern Festival was over, Chang Haonan went directly to Ding Gaoheng and applied to organize a symposium in the field of optoelectronics and materials physics in the name of the Science and Industry Committee.

The number of participants doesn’t have to be too large, but it does have to be reliable enough.

In fact, when Ding Gaoheng heard the three words "symposium", he basically agreed in his heart——

The last time Chang Haonan made a similar request was about three years ago.

That China Aerospace Engine Industry Conference.

As for the result...

Everyone has seen it.

China's aviation industry has been directly introduced into a new era.

Although Chang Haonan said that the scale of this discussion will definitely be much smaller than the last time, Ding Gaoheng is not greedy.

Even if he could achieve one-tenth of the effect, he would be very satisfied.

However, before finally nodding, Ding Gaoheng confirmed it in detail:

"This symposium... what are you ultimately planning to achieve?"

After all, there is a difference between consent and agreement.

Chang Haonan’s answer was straightforward:

“I discovered that ultra-short pulse lasers can be used to perform precise cold processing on any electronically active material, and this is probably the most critical technology in the production and finalization process of the turbofan 10 engine.”

"!!!"

Ding Gaoheng's whole body tensed up instantly——

Are there any inheritance relationships among these studies co-authored by Chang Haonan?

Then there is nothing more to say.

Naturally, I fully support it.

"Just tell me directly, which units are you going to include?"

Ding Gaoheng said and pulled out a note from the side:

"We can give you 100% support for resources within the Science and Technology Commission system. As for resources outside the Science and Industry Commission... we will also try our best to fight for them!"

Since the other party asked this, Chang Haonan was not polite and immediately took out the information he had prepared and handed it to the other party:

"The first is the Haojing Institute of Optics and Mechanics. I checked some information and found that they are the only one in the country that can immediately come up with a picosecond-level pulse laser that meets my power requirements."

"There is also the Institute of Applied Optics of Ordnance Industry Group, which has a relatively deep accumulation in the field of overall research and development of optoelectronic systems."

"There is an Atomic Energy Research Institute under the Nuclear Industry Group. The isotope research and isotope product production capabilities there should be the highest level in the country..."

"..."

Chang Haonan listed the names of nearly ten units in succession.

"In addition, if there are other researchers who specialize in these fields, they can join me as long as the background check is OK."

Ding Gaoheng looked at the table that had been laid out in front of him, knowing in his heart that this should be another big project.

The number of people is not large, but the number of institutions involved is no less than last time.

And a small half of them are in the Academy of Sciences system.

So it’s quite tiring.

However, considering the bright future once successful...

Ding Gaoheng still nodded without hesitation.

…

After all, the Commission of Science, Technology and Industry for National Defense is a military-industrial unit, and its efficiency is still not high.

Although Ding Gaoheng did not dare to confirm the receipt at that time, in fact, before the first month of the year was even out, the units requested by Chang Haonan sent people to the capital one after another.

Especially the first one he named, the most important one among them, the Institute of Optics and Fine Mechanics of Gaojing, directly sent a 10-member team led by Academician Hou Xun.

It even said that Academician Hou's research group could pay for the travel allowance.

Although it didn't cost much money, the intention of supporting the work was still in place.

Considering the small scale of this symposium, it was not held outside the capital like the previous aviation engine industry conference.

Instead, the meeting was directly arranged in the large conference room on the top floor of the Aviation Power Group.

The card and confidentiality were both maximized.

The host of the meeting was Chang Haonan himself.

Now he no longer needs to make a detailed self-introduction.

So, after an extremely brief opening speech, the symposium entered the main topic.

Although Ding Gaoheng did not publicly explain the details of Chang Haonan's convening of this symposium when he reported it before, thanks to the Nature article, everyone basically had a guess.

But...

The direction of the guess was more or less misled by Chang Haonan.

For example, Hou Xun.

After the symposium officially began, as the only academician among the crowd, he naturally got to speak first.

"Professor Chang, you gathered the comrades this time, are you going to set up a project on continuous laser processing in the name of the Aviation Power Group?"

Hou Xun's voice was full of obvious concern -

Of course, not for Chang Haonan, but for Chang Haonan's research:

In fact, Academician Hou's main research direction in the past ten years has been ultrashort lasers, and he even advocated the establishment of a "National Key Laboratory of Transient Optics and Photonic Technology".

The femtosecond laser that Chang Haonan has been thinking about is the product of this laboratory.

However, at the specific process level, it is still a long way from commercialization.

This is also a common problem faced by ultrashort laser processing around the world.

Therefore, when he saw the paper published by Chang Haonan in Nature half a month ago, his first reaction was... panic.

Although he had never met or worked with Chang Haonan in the past, Hou Xun had heard of his name many times.

At first, he generally believed in those miraculous rumors and didn't believe them.

But the proof of the Poincare conjecture last year had a huge impact.

He had to believe it.

After that, Academician Hou gradually accepted many of Chang Haonan's deeds.

And such a magical person suddenly published a paper one day.

It was a Nature paper.

The content was completely opposite to the direction of his research.

And it happened that his research had not made any obvious breakthroughs for a long time...

Who wouldn't be disappointed?

That's why Academician Hou said he wanted to go without thinking when he heard that Chang Haonan was going to hold a symposium and might also do projects related to laser processing.

Even if he had to pay for it himself, he had to go.

He had to argue with Chang Haonan.

Even if he lost, he had to lose clearly.

For this reason, he had prepared sufficient research materials before the meeting, ready to explain to the other party that the potential of pulsed lasers was at least not weaker than that of continuous lasers.

Moreover, before asking the question just now, he had even prepared himself mentally for all these materials to become waste paper.

But...

Chang Haonan's answer was completely beyond his expectations:

"Academician Hou, we are indeed preparing to study the related topics of laser hole making and laser cutting, and we are not just doing it for a small scale, but are finally preparing to achieve industrial production."

"However, now we can make it clear to the comrades attending the meeting that the specific technical solution is not a continuous laser source, but a picosecond or even femtosecond pulsed laser source."

As soon as Chang Haonan finished speaking, Academician Hou had already said what he had prepared long ago:

"Professor Chang, according to my research, pulsed laser..."

"Wait..."

It was not until the first sentence was halfway through that the latter realized that something seemed wrong...

"Professor Chang, you just said...you are also going to take the route of pulsed laser source?"

Chang Haonan nodded:

"That's right."

Academician Hou, who had already made sufficient psychological preparations, only felt his scalp tingling:

"But the paper you published at the beginning of the month was not...the mechanism of continuous laser..."

Hearing this, Chang Haonan smiled with a successful trick:

"That...is used to mislead competitors."

In an instant, the air in the entire venue almost froze.

Everyone's reaction was almost the same -

Published a paper in Nature just to mislead competitors?

We haven't even published our main research direction in Nature?

After a moment of silence, Chang Haonan continued:

"From your reaction just now, Academician Hou, the effect of this misleading...seems to be quite good."

After speaking, he raised his arm and tapped the space bar of the laptop in front of him.

The theme of today's meeting was projected on the screen -

"Research on Ultrashort Pulse Laser Processing Technology of Special-shaped Air Film Holes in Aircraft Engines".