Chapter 877 Key Technology: Ultra-Short 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 A paper was published in the journal Nature. Based on the Boltzmann transport equation and lattice dynamics theory, a transient thermoelastic model of the laser-material interaction mechanism that is different from the traditional two-temperature model is proposed, and it is almost It completely fits the processing situation of large-thickness CFRP plates with continuous laser source.
What is even more coincidental is that 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.
It is also 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 website, most of the papers that appear on it are actually of little value in themselves.
But the amount of content published on it within a period of time is a small window that can make a big difference.
In the next week, the number of new entries related to composite materials processing surged by nearly 15%...
It can only be said that materials researchers should never doubt that they are chasing hot topics. sense of smell.
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 has a follow-up combo punch.
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 in About three years ago.
The China Aerospace Engine Industry Conference.
As for the result...
Everyone has seen it.
China's aerospace 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 can achieve one-tenth of the effect, he will be very satisfied.
However, before finally nodding, Ding Gaoheng confirmed it specifically:
"This symposium... what are you ultimately planning to achieve?"
After all, there is still a difference between consent and agreement.
Chang Haonan’s answer was straightforward:
“I have discovered that any electronically active material can be accurately cold processed using ultra-short pulse lasers, and this is likely to be the case with vortex vortices. The most critical technology in the fan 10 engine production and shaping process! ”
Ding Gaoheng's whole body tensed up in an instant——
Is there any inheritance relationship between these studies that he co-authored with Chang Haonan?
Then there is nothing to say.
Of course 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 Technology 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:
"First of all, it is the Haojing Institute of Optics and Mechanics. I checked some information. , they are the only ones in the country who can immediately come up with picosecond-level pulse lasers that meet my power requirements.”
“There is also the Ordnance Industry Group’s Applied Optics Research Institute, which has a relatively deep accumulation in the overall research and development of optoelectronic systems.”
"There is an Atomic Energy Science 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 in succession The names of nearly ten units were announced.
"In addition, if there are other researchers who specialize in these fields, they can join me if they are sure that the background check is OK."
Ding Gaoheng Looking at the table that had been laid out in front of me, I knew in my 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 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 good.
Although Ding Gaoheng did not dare to confirm the receipt at the time, in fact, before the first month of the year was even out, the units requested by Chang Haonan were sending people to the capital one after another. In particular, the Haojing Institute of Optics and Mechanics, the first one he named and the most important among them, directly dispatched a team of 10 people led by Academician Hou Xun.
It even stated that Academician Hou’s research team can pay the travel subsidy by itself.
Although it doesn’t cost much, the intention of supporting the work is still in place.
Considering that the scale of this symposium is not large, it will not be held outside the capital like the previous aviation industry conference.
Instead, the meeting location was directly arranged in the large conference room on the top floor of the Aerospace Power Group.
Both the cards and the level of confidentiality are full.
The meeting was chaired by Chang Haonan himself.
Now he no longer needs to introduce himself in detail.
So, after a very brief opening remarks, the symposium got down to business.
Although Ding Gaoheng did not publicly explain the details of the symposium convened by Chang Haonan in his previous report, everyone basically had a guess thanks to the Nature article.
It’s just that...
The direction of the speculation was somewhat misled by Chang Haonan.
For example, Hou Xun.
After the symposium officially started, as the only academician among the crowd, he naturally got the first one to speak.
"Professor Chang, are you gathering comrades together this time to initiate a project on continuous laser processing in the name of the Aerospace Power Group?"
Hou Xun's voice had an obvious tone. Concern——
Of course it is not about Chang Haonan, but the research on Chang Haonan:
In fact, in the past ten years or so, Academician Hou's main research direction 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, there is still a long way to go before commercialization.
This is also a common problem faced by ultra-short laser processing around the world.
So, when he saw the paper Chang Haonan published 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 his name many times.
In the beginning, regarding those mythical rumors, he generally followed the attitude of not believing them.
But the time when Poincaré’s conjecture was proved last year was really too influential.
I have no choice but to believe it.
After that, Academician Hou gradually accepted the many deeds of Chang Haonan.
And such a magical person suddenly published a paper one day.
It’s still Nature.
The content is completely opposite to the direction I am studying.
And it just so happens that there has been no obvious breakthrough in my research for a long time...
Who is it that is not in vain?
It is precisely for this reason that when he heard that Chang Haonan was going to hold a symposium and possibly engage in laser processing-related projects, Academician Hou said he wanted to go without even thinking about it.
You have to go even if you pay for it yourself.
I have to argue with Chang Haonan.
Even if you lose, you have to lose clearly.
To this end, he had prepared sufficient research materials before the meeting, and was ready to explain to the other party that the potential of pulse lasers was at least not weaker than continuous lasers.
Moreover, before asking the question just now, he was even mentally prepared for all the information to be turned into waste paper.
But...
Chang Haonan’s answer was completely beyond his expectation:
“Academician Hou, we are indeed preparing to study laser hole making and laser cutting. Related topics, and it is not a trivial matter, but a final preparation for industrialized production.”
“However, it is now clear to the comrades participating in the meeting that the specific technical solution is not a continuous laser source. , but a picosecond or even femtosecond pulse laser source.”
As soon as Chang Haonan finished speaking, Academician Hou already said what he had prepared:
"Professor Chang, according to my research, pulse laser..."
"Wait a minute ..."
It wasn't until halfway through the first sentence that the latter realized that something seemed wrong...
"Professor Chang, you just said...you are also going to do pulse surgery. The route of the laser source?”
Chang Haonan nodded:
"That's right."
Academician Hou, who had been mentally prepared, only felt his scalp numb:
"But the article you posted at the beginning of the month The paper is not...the mechanism of continuous laser..."
Hearing this, Chang Haonan showed a scheming smile:
"That...is used to mislead competitors."
For a moment, the air in the entire venue almost froze.
Everyone’s reaction was almost the same—
In order to mislead competitors, they published a Nature article?
Our main research direction has not been sent to Nature?
After a moment of silence, Chang Haonan continued to speak:
"Judging from your reaction just now, Academician Hou, the effect of this misdirection... seems to be pretty good."
After speaking, He raised his arm and lightly tapped the space bar of the laptop in front of him.
The theme of today's meeting was then projected on the curtain -
"Research on Ultra-Short Pulse Laser Processing Technology for Special-shaped Air Film Holes in Aeroengines".
(End of this chapter)