Chapter 1472

"0.125 mm3?"

After listening to Zhuang Jianye's words, the tone of several experts present has changed. There is no way. The parameter given by Zhuang Jianye is really shocking.

The reason for this is very simple, that is, the core of the chip level atomic clock is not as simple as several integrated circuits. Because the atomic clock uses the atomic oscillation frequency to determine the accuracy of time, under the constraints of this physical law, regardless of the shape of the atomic clock, there must be at least two cavity structures inside, One is a vertical cavity in which atoms vibrate when irradiated by a microwave light source; The other is the spacer cavity with strong and weak separation of atoms.

If we want to miniaturize or even chip the atomic clock, we must solve these two cavity problems, especially the interval cavity with the separation of atomic strength behind it, because it involves whether strong atoms can hit the bull's eye and make the components vibrate according to the normal cycle, so as to determine the time accuracy.

It can be said that without this cavity, the atomic clock has no heart, and the best atomic clock can only be a decoration.

The problem is that this kind of cavity structure is not difficult to do when it is large, but it is very difficult to do when it is small. Take the free beauty room, which is leading the world in this field.

As early as the early 1980s, the alkali metal vapor bubble structure was proposed as the spacer cavity for atomic strength separation of atomic clock. Due to process reasons, the glass bubble manufacturing process was not completed until the late 1980s, reducing the spacer cavity system for atomic strength separation from the original 27 square decimeters to 3.6 square centimeters, so as to realize the chipization of atomic clock.

By the end of the 1990s, based on the glass bubble manufacturing process, free beauty developed the carbon dioxide laser induction technology of hollow glass fiber, which further reduced the spacer cavity with atomic strength separation of more than 1 square centimeter to 5 square millimeters.

The volume of the atomic clock is further reduced, which greatly improves the GPS technology level of freedom and beauty.

In this regard, the free and beautiful room has made no secret of it. The generous publication of its achievements to the world naturally attracts the praise and envy of the whole world, but only praise and envy, because the free United States has brought these two technologies to the prohibited export list.

In other words, other countries in the world can look at it, but they don't want to get it.

As for whether someone can get pregnant with a few eyes, freedom and beauty do not worry, because this involves manufacturing and technology, the process itself is very complex, and all are concentrated in the semiconductor field.

In addition to the free and beautiful room of semiconductor manufacturing in today's world, how many can play?

Japan?

Long been repaired, kneel down and call Dad!

the republic of korea?

That is the senior worker in the free and beautiful room!

Russia?

The wrong technology tree was clicked. The weight of the Russian atomic clock has been hovering around 50kg. If it were not for the high thrust rockets left over from the Soviet era, the Russian navigation satellites would have been on the street.

As for Europe

It took 15 years. As a result, the volume of the spacer cavity with the separation of atomic strength can only be 1.5 square centimeters, which is only the level in the early 1990s.

That's it... Europeans have not forgotten to put gold on their face and say that the atomic clock technology level of Galileo navigation satellite is the world's leading. In fact, Europeans have just started in chip level atomic clock.

Not to mention that the comprehensive technical level in China is not as good as that in Russia, which is why many people in China hope to obtain advanced manufacturing technology of atomic clock through cooperation with Europe.

The reason is very simple. Even if it can't reach the level of directly falling to square millimeters between freedom and beauty, it's a good progress to reach square centimeters.

But unexpectedly, China's take-off has not only reached the cubic millimeter level, but also further reduced to 1 square millimeter, reaching an amazing 0.125 square millimeter

You should know that this degree is almost the same as the bubble cavity volume in the atomic clock used by the GPS III navigation satellite just released by free beauty.

Under such circumstances, how can we not let the people present like a dream? The domestic technical level in this regard is really higher than that in Europe, and is at the same level with freedom and beauty?

"Please look, this is the finished product of rubidium atomic bubble we just produced..."

Just when everyone present was shocked by 0.125 mm2, Zhuang Jianye had taken a prototype silicon wafer from the assistant's hand, pointed to the squares on it that were less than the size of the nail cap and said, "our bubble cavity uses high-purity silicon wafer with a thickness of 523 microns. Up and down, this is 7740 glass with a thickness of one micron..."

With that, Zhuang Jianye pointed to several running equipment not far away and said: "The processing technology we use is the same as that of the chip, which is to clean the silicon wafer, and then carry out dry oxygen and wet oxygen; then use the 193 nm lithography machine to process the circuit and cavity, further finish machining in the special etching machine, then lay the circuit, inject rubidium atoms, flush nitrogen and argon, and finally package and test.

The whole process is the processing process of a set of semiconductor chips. Thanks to our continuous investment in the semiconductor industry chain over the years, now such bubble cavities can be fully localized. Of course, additional investment is required for mass production. Compared with our test workshop, many equipment and processes are not perfect, We need professional plants and equipment to optimize efficiency and cost... "

What Zhuang Jianye said earlier is quite good, which fully reflects the professional quality of a person in charge of a super large central enterprise. It can be said that the taste is wrong. What specialty and quality are not as important as money.

Fortunately, it's not surprising that the head of the headquarters has been talking about Zhuang Jianye's feelings about money. In particular, the head of the headquarters has not seen Zhuang Jianye talk about money in front of him for so many years. His ears automatically ignore the money behind Zhuang Jianye, but after a few heads down discussions with several headquarters leaders and experts, He reached out and took the silicon wafer in Zhuang Jianye's hand. Under the guidance of several professionals, he looked carefully with a special sight glass and nodded: "yes, it seems that you Chinese take-off have indeed made great efforts in this regard..."

Then he looked up at Zhuang Jianye, pointed to the silicon chip in his hand and asked, "by the way, this processing technology is also used in the other cavity of your chip level rubidium atomic clock?"

Zhuang Jianye nodded: "the general process follows the bubble cavity, but compared with the high power of the traditional inert gas light source and carbon dioxide laser light source, we use a new cavity laser as the light source for rubidium atom oscillation separation..."

"What's your power?" the head of the headquarters asked.

Zhuang Jianye narrowed his eyes and smiled: "not many, but only 17 micro watts!"

The head of the headquarters immediately changed his tone: "17 microwatts... Just?"