Chapter 877 Key Technology: Ultrashort Laser Processing

Time passes day by day.

After returning to work after 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 group from China published a paper in the journal Nature. Based on the Boltzmann transport equation and lattice dynamics theory, they proposed a transient thermoelastic model of the laser-material interaction mechanism that is different from the traditional two-temperature model, and almost completely fits the processing of thick CFRP plates by continuous laser sources.

What’s even more coincidental is that the corresponding author of this paper is Chang Haonan, who participated in proving the Poincare conjecture last year but almost disappeared since then.

No one has heard of the first author before, but it is thought that he should be a student in Chang Haonan's research group.

Obviously, he was not in seclusion during the past six months.

Instead, he focused his energy on guiding students.

Or cross-border guidance.

He also directed a Nature article...

Chunchun is no longer a human being.

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

In short, the popularity of this article was incredibly high for a while.

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

Especially arXiv.

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

But the amount of content posted on it over a period of time is a window into the big picture.

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

All I can say is, never doubt the nose of materials researchers for hot topics.

And this is exactly what Chang Haonan wants to see.

Amid the high level of enthusiasm, some research groups, even if their own research direction is ultrashort pulse lasers, will most likely allocate some of their efforts to explore the direction of traditional continuous laser processing.

Or at least repeat the experiments in his paper.

And if one Nature article isn’t enough…

He also has a follow-up combination punch.

Therefore, 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 Technology Commission.

The number of participants does not have to be too large, but it must be reliable enough.

In fact, when Ding Gaoheng heard the word "symposium", he basically agreed in his heart -

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

That China Aviation Engine Industry Conference.

As for the result...

Everyone has seen it.

China's aerospace industry was directly introduced into a completely new era.

Although Chang Haonan said that the scale of this symposium would definitely be much smaller than the last time, Ding Gaoheng was not greedy.

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

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

"What is the ultimate purpose of this symposium?"

After all, there is still a difference between consent and assent.

Chang Haonan's answer was straightforward:

"I found that ultrashort pulse lasers can be used to accurately cold process any electronically active material, and this is likely to be the most critical technology in the production and finalization of the WS-10 engine."

"!!!"

Ding Gaoheng tensed up instantly.

Does this mean that Chang Haonan’s research has some inheritance relationship?

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 as he 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 Technology Commission... we will also strive for them with all our strength!"

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:

"First, the Gaojing Institute of Optics and Fine Mechanics. I checked some information and found that they are the only one in the country that can immediately produce a picosecond pulse laser that meets my power requirements."

"There is also the Institute of Applied Optics of the China North Industries Group Corporation, which has a relatively deep accumulation in the 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 a row.

"In addition, if there are other researchers who specialize in these fields, they can also join me as long as their background checks are satisfactory."

Ding Gaoheng looked at the table in front of him and knew that this would be another big project.

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

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

So it is still quite tiring.

However, considering the bright future once success...

Ding Gaoheng nodded without hesitation.

……

After all, the Commission of Science, Technology and Industry for National Defense is a military-industrial unit, so its efficiency is beyond reproach.

Although Ding Gaoheng did not dare to make a guarantee at that time, in fact, before the first month of the lunar year was even over, the units requested by Chang Haonan had already sent people to Beijing one after another.

In particular, the first one he named, which was also the most important one, was the Gaojing Institute of Optics and Fine Mechanics, which directly sent a 10-person team led by Academician Hou Xun.

It was even stated that Academician Hou's research team could pay for the travel allowance on their own.

Although it doesn't cost much, the intention of supporting the work is still there.

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

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

The cards and confidentiality levels are both maximized.

The meeting was hosted by Chang Haonan himself.

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

So, after an extremely brief opening statement, the symposium got down to business.

Although Ding Gaoheng did not publicly disclose the details of the symposium convened by Chang Haonan in his previous report, thanks to the Nature article, everyone basically had a guess.

only……

The direction of the speculation was somewhat misled by Chang Haonan.

For example, Hou Xun.

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

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

There was obvious concern in Hou Xun's voice.

Of course, it is not about Chang Haonan, but about the research on Chang Haonan:

In fact, Academician Hou’s main research direction over the past decade 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 had been dreaming of was the product of this laboratory.

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

This is also a common problem faced by ultra-short 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 the other's name many times.

At the beginning, regarding those miraculous rumors, he generally took the attitude of "hear it is not true" and did not believe them.

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

I have 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.

Still an article from Nature.

The content is completely opposite to what I am currently researching.

And it just so happens that my research has not made any significant breakthroughs for a long time...

Who wouldn’t feel weak?

That is why, when Academician Hou heard that Chang Haonan was going to hold a symposium and might also carry out projects related to laser processing, he said he wanted to go without thinking twice.

I'll go even if I have to pay for it myself.

I have to compete with Chang Haonan to see who is better.

Even if you lose, you have to lose clearly.

To this end, he had prepared sufficient research materials before the meeting, ready to explain to the other party that the potential of pulsed lasers is at least as good as that of continuous lasers.

Moreover, before asking the question just now, he was even mentally prepared 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 on a small scale, but are eventually preparing to achieve industrial production."

"However, we can now make it clear to the participants 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 said what he had prepared long ago:

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

"and many more……"

It wasn't until halfway through the first sentence that the latter realized something was wrong...

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

Chang Haonan nodded:

"Yes."

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

"But the paper you published earlier this month was not about...the mechanism of continuous laser..."

Hearing this, Chang Haonan smiled with a look of success:

"Well... it's used to mislead competitors."

For a moment, the air in the entire venue almost froze.

Everyone's reaction was almost the same -

Just to mislead competitors, you published an article in Nature?

Our main research direction has not been published in Nature?

After a moment of silence, Chang Haonan continued:

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

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

The theme of today’s meeting was then projected onto the screen:

"Research on Ultrashort Pulse Laser Processing Technology for Irregular Shaped Film Holes in Aero-engines".