Chapter 205 One month, one month at most (3k)
The only troublesome thing is the ruby laser rod. This thing is called ruby, but it is not just a matter of buying a natural ruby. Although it is big Such a large natural ruby is super expensive, too expensive to afford, but it is of no use.
However, Gao Zhendong had already thought about it and would just start with the single crystal furnace. However, he had to think carefully about any excuses he could find.
No matter what, in one month, at most one month, I will let the world's first laser be born on our land!
After thinking about it for half a night, Gao Zhendong came to the single crystal furnace laboratory early the next morning.
He invited Yu Yuncheng over and asked: "Gong Yu, what is the progress of the single crystal furnace now?"
Yu Yuncheng smiled and said: "With the thermal field structure and temperature of the single crystal furnace you gave me, Gradient materials and empirical formulas, as well as thermal field preparation and debugging precautions, as well as process requirements such as furnace loading, melting, seeding, necking, shoulder turning, equal diameter growth and finishing, are progressing smoothly and are now complete. I tried pulling it with scraps and ordinary crystals several times, and the effect was good, but I am still debugging and exploring, and I am not willing to use seed crystals yet."
Gao Zhendong nodded: "Well, the progress is indeed good, now. How many materials have you tried? In addition to silicon crystals, Yu Yuncheng was stunned: "Apart from silicon, I have only tried other materials, and I don't have this in my budget." The money has to be put behind."
Gao Zhendong smiled and said: "Well, you try to pull the alumina. This thing is hard and has some use. As for the material funds, I will pay for it first."
This is the method Gao Zhendong came up with. In the name of scientific research, he would first spend his own money to do it directly. As long as there are results and they are the best in the world, then there will be no big problems no matter what he does.
As I said before, results are the last word. If you have the goods in hand, why do you need to look forward and backward so much?
Hearing his words, Yu Yuncheng was stunned: "Corundum? This thing."
Corundum is a natural alumina gemstone. This thing is the most natural material besides diamonds. The hard one, with a Mohs hardness of 9.
He did not continue what he said next. This thing is hard, and it might be useful in some places that Gao Zhendong couldn't explain clearly. He knew that there were many things Gao Zhendong was doing that he could not tell him.
So he didn't say anything more about what he brought this thing for, but he just hesitated: "You pay for it yourself?"
Gao Zhendong smiled and said: "Nothing, the raw materials for this thing don't cost much. You don't have to Worry, I have channels to solve these problems. If the number is too large, there will be a unit that will handle it.”
Alumina cannot be pulled out too big by the Czochralski method, and the limit is only about ten centimeters. , so the raw materials don’t cost much. Four pieces of 9-purity alumina powder cost less than 100 yuan per kilogram in Gao Zhendong’s previous life.
Seeing that Gao Zhendong was confident, Yu Yuncheng did not hesitate. Someone paid to help him test the material adaptability of the single crystal furnace. This was a good thing. If the sky fell, Gao Zhendong, a tall man, would be able to hold it up.
"Then what are you going to do? Do you have a preliminary design of the process."
Gao Zhendong said: "Use more than 99.99% alumina powder. Before heating, the vacuum in the furnace should be kept between 0.00133 and 0.04 Pascal, and then filled with argon for protection. The crystal diameter should be more than 5cm, and should not exceed 12cm. Specifically You can control how thick it is according to the situation. The length of the crystal should be 7-10cm, and it should not exceed 12cm."
Yu Yuncheng nodded after hearing Gao Zhendong's request: "Well, that's not your request. Gao, you can give it a try."
Gao Zhendong added: "It just so happens that you can try the doping process. You haven't tried it before, right?"
Yu Yuncheng said with a smile: "Hey. , You are right, I have never tried it before. What should be mixed? How to mix it? "
Gao Zhendong smiled: "That's right, the mass fraction of chromium oxide is 50000." br>
Don't look at this little bit of chromium. These trivalent chromium ions are exactly the activation ions needed to generate lasers.
Yu Yuncheng thought for a while and said: "This is easy to handle. Just use chromium oxide powder and alumina powder and mix them thoroughly in the crucible. This is not a volatile material, so there is no need for a doping spoon."
Unexpectedly, I could try doping by the way. Yu Yuncheng became more and more satisfied with this extra-staff crystal pulling test.
Gao Zhendong handed him another small piece of something: "Let's use this as a seed crystal."
Yu Yuncheng looked surprised: "Ha, have you even prepared this?" After saying that, I felt a little sigh in my heart, there is really no comparison between people.
For this thing, Gao Zhendong extracted another set of lasers from the system, and then took out the ruby laser rod inside and used it as a seed crystal.
As for whether using this thing as a seed crystal can really pull out a ruby crystal that meets the requirements, Gao Zhendong doesn't care, he just uses this as an excuse.
He only asked that the crystal pulled out by Yu Yuncheng look like this, and then sent to be processed according to the shape and size of the finished laser. After all, what is really used to display the results is the system. The extracted finished laser.
Yu Yuncheng took this "seed crystal" and went to make preparations happily. Although it sounds simple, it is estimated that the finished product will not be available within a few days. Yu Yuncheng will definitely try pulling it with ordinary alumina crystals a few times before using seed crystals.
Seed crystals are precious. Unexpectedly, now, when the specific process parameters of silicon single crystal are not completely determined, he has not been willing to use real silicon seed crystals. That seed crystal was obtained from the General Research Institute of Science and Technology. The ones I bought were only a few millimeters square.
But in terms of time, it is still plenty.
After solving the problem of chromium-doped ruby crystal, Gao Zhendong turned to Lao Chen from the technical department.
Seeing him coming in with a smile, Lao Chen said with a smile: "Zhendong, what good thing can you do if you smile so happily?"
Gao Zhendong poured himself a glass of water: "Master, good things are good, I have been I was inspired to do some research in other majors. I felt that it was interesting, and it was something that could fill an international gap. Master, let’s do it together, master and disciple.”
Lao Chen did not agree immediately and said with a smile: "What major?"
Gao Zhendong took a sip of water: "High-energy physics."
Lao Chen waved his hand: "Guanggun, I know something." Damn high-energy physics, if you put my name on it, I won’t be ashamed to death. I’m afraid my old classmates will laugh to death.”
Gao Zhendong said: “I won’t be happy with you here. The old man is like a new bud, entering a new research field?"
Old Chen looked at him sideways: "Without you, I can produce results in any new field. With you as my apprentice, I can do it. As long as I enter a field that is not my specialty, a discerning person will know at a glance, oh, Lao Chen is taking advantage of his apprentice again! Don't, I can't afford to lose face."
Knowing Lao Chen's temper, Gao Zhendong couldn't persuade him, so he had to give up.
However, although Lao Chen did not agree, he was very happy in his heart and added: "I won't take advantage of you anymore. You do your thing. Come back and make up a plan so that the factory can take advantage of it. ”
Knowing that Gao Zhendong’s habit is not to let go of eagles when he sees rabbits, and not to worry about Japanese enemies when he sees them, he must be quite confident when he proposes a plan.
And he didn’t mention the plan to the factory at the beginning, presumably because he couldn’t spend a lot of money, so Lao Chen simply proposed this win-win suggestion. The factory would spend a little money to get some benefits, and he can guarantee that this will When the matter was brought up to Deputy Director Li, who was in charge of finance, there was absolutely no problem at all.
That guy is still promoting matching funds for Gao Zhendong’s research laboratory, just to support the ministry funding projects that the research laboratory has received.
For Lao Chen, this is like taking advantage of his apprentice. He is the leader of the factory. If there are bright spots in the factory, especially technical ones, then his share will not be lost.
So Gao Zhendong, through Lao Chen, first placed a few orders and went to the relevant departments in the factory to solve the sources of spare parts such as silver-plated light condensing cavities, gas light-emitting tubes (light pumps), casings, brackets, etc. question.
The main reason is that this laser is a prototype, which is really simple. If it is a practical finished laser, it will be more troublesome. At this time, there are no semiconductor laser components.
Gao Zhendong himself is ready to solve the remaining problems.
Controlling the power supply of optical pump flash, thoroughly understanding the principles of ruby lasers, and writing a thesis on lasers.
Needless to say about the power supply, the optical pump of the pulse laser does not emit light continuously and requires flash control. Fortunately, you can just follow the circuit diagram on the instruction material and there is no difficulty, especially if it is just a show.
As for the second one, it is a bit more troublesome, starting from Einstein’s principle theory of light stimulated emission in 1917 to Brossell’s “optical pump” that won the Nobel Prize in Physics in 1950. "Stimulation" technology, and then the theory of "Microwave Amplification of Stimulated Radiation" in 1958, all of which require him to understand and digest, otherwise it will be easy to make a joke.
At the same time, there are many kinds of lasers. Why chromium-doped ruby can emit red laser also requires theoretical explanation. As the inventor, these questions must be answered by him.
Because there is a very interesting episode here, that is, in the mainstream view of researchers, ruby is not a good material for making lasers. This even includes the theory of "microwave amplification of stimulated emission of radiation" The proposer himself.
So if ruby is used to make a laser, it can indeed be installed in a big wave. But if Gao Zhendong himself cannot explain the reason, then this wave of big ones will become a big joke.
Fortunately, the explanatory materials in his hand are very thorough in these analyses. It is not too difficult to learn the relevant knowledge with the answers instead of entering this branch of physics comprehensively.
The third one is very straightforward. Gao Zhendong plans to write the paper based on the theory he has learned while waiting for the device to be processed. This is a basis for his work. After all, the core and main body of the paper are in the explanatory materials he has.
In this way, he can find channels to send out this paper as quickly as possible while successfully demonstrating the laser.
Soldiers are valuable and quick. If you want to rob, do it completely.
(End of this chapter)