Chapter 205 One month, at most one month (3k)

The only troublesome thing is the ruby ​​laser rod. Although it is called ruby, you can't just buy a natural ruby. Although a natural ruby ​​of this size is extremely expensive and too expensive to buy, it is of no use.

However, Gao Zhendong had already thought about it and decided to start with the single crystal furnace, but he had to think about what excuse to find.

No matter what, in one month, at most one month, I will make the world's first laser born on our land!

After thinking for half the night, Gao Zhendong went to the single crystal furnace laboratory early the next morning.

He invited Yu Yuncheng over and asked, "Engineer Yu, what is the current progress of the single crystal furnace?"

Yu Yuncheng smiled and said, "With the thermal field structure of the single crystal furnace you provided, the materials and empirical formulas for the temperature gradient, as well as the precautions for thermal field preparation and debugging, as well as the process requirements for furnace loading, melting materials, seeding, necking, shoulder release and shoulder rotation, equal diameter growth and finishing, the progress is very smooth. Now we have tried to pull it several times with waste materials and ordinary crystals, and the effect is good. However, we are still debugging and exploring, and we are not willing to use seed crystals to pull it."

Gao Zhendong nodded: "Well, the progress is indeed good. How many materials have you tried now? In addition to pulling silicon crystals."

Yu Yuncheng was stunned: "Apart from silicon, we have only tried silicon dioxide. We don't have other materials yet, and we don't have the money in the budget, so we have to put it aside."

Gao Zhendong smiled and said, "Well, try pulling alumina. It's hard and has some uses. As for the material expenses, I'll pay for it first."

This is the solution Gao Zhendong came up with. In the name of scientific research, he would pay for it himself and 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 how he does it.

As I said, results are the bottom line. If you have the goods in your hands, why bother to worry so much?

Hearing his words, Yu Yuncheng was stunned: "Corundum? This thing."

Corundum is a natural aluminum oxide gemstone. Apart from diamonds, it is the hardest natural material, with a Mohs hardness of 9.

He didn't continue the rest of the conversation. This thing was hard, and it might be very useful in some places that Gao Zhendong couldn't tell. He knew that there were many things Gao Zhendong couldn't tell him.

So he didn't ask what he was going to do with it, but hesitated: "You pay for it yourself?"

Gao Zhendong smiled and said, "It's nothing. The raw materials for this thing don't cost much. Don't worry, I have channels to solve these problems. If the amount is too large, there will naturally be a unit to deal with it."

Alumina cannot be pulled out to a very large size using the direct pulling method. The limit is probably only about ten centimeters, so the raw materials don't cost much. Alumina powder with a purity of 4 cost less than 9 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, there was a tall man like Gao Zhendong to hold it up.

"So how are you going to do it? Do you have a preliminary design for the process?"

Gao Zhendong said: "Use alumina powder with a content of more than 99.99%. Before heating, the vacuum degree in the furnace should be maintained between 0.00133 and 0.04 Pascal, and then fill with argon for protection. The crystal diameter can be more than 5 cm, not more than 12 cm. You can control how thick it is according to the situation. The length of the crystal can be 7-10 cm, and should not exceed 12 cm."

After listening to Gao Zhendong's request, Yu Yuncheng nodded and said, "Well, your request is not high. You can give it a try."

Gao Zhendong added: "You can try the doping process. You haven't tried it before, right?"

Yu Yuncheng smiled and said, "Hey, you're right. I haven't tried it before. What should I add? How should I add it?"

Gao Zhendong smiled: "That's perfect, add chromium oxide, the mass fraction is 0.05%. "

Don't underestimate this little bit of chromium. These trivalent chromium ions are exactly the activation ions needed to generate lasers.

Yu Yuncheng thought for a moment and said, "This is easy to do. Just mix the chromium oxide powder and aluminum oxide powder in a crucible. This is not a volatile material, so there is no need for a doping spoon."

It was an unexpected surprise, and he could also try doping at the same time. Yu Yuncheng became more and more satisfied with this unplanned crystal pulling experiment.

Gao Zhendong handed him another small piece of something: "Use this as a seed crystal."

Yu Yuncheng's face was full of surprise: "Ha, you have even prepared this?" After saying that, he sighed in his heart, people really can't be compared.

This thing was made by Gao Zhendong after he extracted another set of lasers from the system. He then removed the ruby ​​laser rod inside and used it as a seed crystal.

As for whether using this thing as a seed crystal can really produce ruby ​​crystals that meet 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 the real thing, and then send it for processing according to the shape and size of the finished laser. After all, the finished laser extracted from the system was what was really going to be used as a display of results.

Yu Yuncheng took this "seed crystal" and happily went to do the preparation work. Although it sounds simple, it is estimated that the finished product will not be available within a few days. Yu Yuncheng will definitely try to pull it a few times with ordinary alumina crystals before using seed crystals.

Seed crystals are very valuable. Until now, when the specific process parameters of silicon single crystals have not been completely determined, he has not been willing to use real silicon seed crystals. The seed crystal was bought from the General Research Institute and is only a few millimeters square in size.

But in terms of time, it's still plenty.

After solving the problem of chromium-doped ruby ​​crystal, Gao Zhendong turned to visit Lao Chen in the technical department.

Seeing him come in with a smile on his face, Lao Chen said with a smile: "Zhendong, you are smiling so happily, what's the good news?"

Gao Zhendong poured himself a glass of water and said, "Master, good news, good news. I recently got an inspiration and did some research in other fields. I think it has potential and can fill an international gap. Master, let's do it together."

Lao Chen didn't agree immediately, and smiled and said, "What major?"

Gao Zhendong took a sip of water: "High-energy physics."

Old Chen waved his hand and said, "Get lost. I know nothing about high-energy physics. If you put my name on it, I won't be embarrassed to death, but I'm afraid my old classmates will laugh at me to death."

Gao Zhendong said, "That's not right. Why can't you, an old horse in the stable, make new buds on the old tree and enter a new research field?"

Old Chen squinted at him and said, "If it weren't for you, I could come up with any new achievements. With you as my apprentice, as long as I enter a field that I'm not good at, anyone with a discerning eye will know that Old Chen is taking advantage of his apprentice again! No, I can't afford to lose face like that."

Knowing Lao Chen's temper, Gao Zhendong saw that he could not persuade him and had to give up.

Although Lao Chen did not agree, he was very happy in his heart and added: "I will not take advantage of you. You do your own thing and come up with a plan later so that the factory can benefit from it."

Knowing that Gao Zhendong's habit is not to release the eagle until he sees the rabbit, and not to pull the string until he sees the enemy, he must have been very confident when he put forward the plan.

Moreover, he didn't propose the plan to the factory at the beginning, probably because it wouldn't cost much money, so Lao Chen simply made this win-win suggestion. The factory would spend a little money and get some benefits. He dared to guarantee that there would be absolutely no problem if this matter was mentioned to Deputy Director Li who was in charge of finance.

That guy is still pushing for matching funds for Gao Zhendong's research lab in order to support the funding projects the lab has obtained from the ministry.

For Lao Chen, this can be considered as benefiting from his apprenticeship. He is the factory leader. If there are any highlights in the factory, especially those in the technical field, then he will have a share of the credit.

So Gao Zhendong placed several orders with the relevant departments of the factory through Lao Chen to solve the problem of the source of spare parts such as silver-plated focusing cavity, gas light-emitting tube (light pump), casing, bracket, etc.

The main reason is that this laser is a prototype and is very simple. If it were a practical finished laser, it would be more troublesome, and there were no semiconductor laser components at that time.

Gao Zhendong himself was preparing to solve the remaining problems.

Control the power supply of the optical pump flash, understand the principles of ruby ​​laser, and write a paper on lasers.

There is no need to say much about the power supply. The optical pump of the pulse laser does not emit light continuously and requires flash control. Fortunately, this thing can be made according to the circuit diagram in the instruction material. There is no difficulty at all, especially if you just want to make it look good.

As for the second one, it was a bit more troublesome. From Einstein's theory of the principle of stimulated radiation of light in 1917, to Brossel's "optical pumping" technology that won the Nobel Prize in Physics in 1950, to the theory of "microwave amplification of stimulated radiation" in 1958, he needed to understand and digest all of these, otherwise it would be easy to make a fool of himself.

At the same time, there are many types 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 opinion of researchers, ruby ​​is not a good material for making lasers, which even includes the originator of the theory of "microwave amplification of stimulated radiation" himself.

So if you use ruby ​​to make a laser, it can indeed make a big splash, but if Gao Zhendong himself cannot explain the reason, then this big splash will become a big joke.

Fortunately, the explanatory materials in his hands provided a very thorough analysis of these issues. It was not too difficult for him to use the answers to learn related knowledge instead of entering this branch of physics in full.

The third one is very straightforward. Gao Zhendong plans to write a paper based on the theoretical knowledge he has learned while waiting for the device processing. This will provide him with a working basis. After all, the core and main body of the paper are in the explanatory materials he has.

In this way, he could find a channel to publish the paper as quickly as possible while the laser was successfully demonstrated.

Speed ​​is of the essence in war. If you want to rob, rob thoroughly.

(End of this chapter)