Military Industry of Great Powers: Build the Strongest Flanker

For He Zhenhua, solving the demand for a one-micron process is far more urgent than copper wires. In the car, He Zhenhua couldn't wait to raise the confusion they faced.

Principal Xu and Director Gao are unable to participate in the discussion on these professional issues.

"The ultraviolet rays emitted by high-pressure mercury lamps include g-line at 436 nanometers and i-line at 365 nanometers. The most ideal state is to filter out the g-line and only retain the i-line. In fact, the i-line accounts for too small a proportion and we cannot obtain sufficient power. i-ray light source..."

Anyone who studies lithography machines knows that the shorter the wavelength of light, the higher the resolution, which is related to a characteristic of light.

That is double-slit interference. The longer the wavelength, the larger the interference slit spacing.

The 365nm i-line obviously has greater advantages than the 436nm g-line.

But if we can’t achieve it technically, we can only stare blankly.

“Try using water!”

"water?"

what's the situation? He Zhenhua was confused.

Zhao Guoqing said: "When 436 nanometer light enters water, its speed is reduced by about 33%. When the frequency remains unchanged..."

"The wavelength will become shorter!" He Zhenhua's voice became high-pitched due to excitement, attracting everyone's attention.

"National Day, you are such a genius. Why didn't I expect that according to this calculation, the wavelength of 436 nanometers in water is equivalent to 326 nanometers of light, which is better than the 365 nanometers of i-line!"

Zhao Guoqing nodded, okay, let me get you excited first. This is a technology that will be developed twenty years later. It requires the entire workbench to be immersed in water, and the photolithography process is also carried out in water.

High-purity water is needed, and the pollution problem must be solved. The corresponding photoresist must be stable, and the medium must also be solved. What about bubbles? There is also waterproof treatment of the entire workbench.

These problems are not easy to solve.

But it’s not a bad thing to be able to conduct research on immersion lithography machines twenty years in advance.

I hope Tsinghua University can start and end in this area.

Immersion lithography will also explode at 193nm deep ultraviolet light, because the refractive index of 193nm deep ultraviolet light is as high as 1.44, and the wavelength after entering water is only 134nm, which is better than the 157nm deep violet light source.

After the excitement, He Zhenhua looked at Director Zhang Chaoxin and nodded slightly.

The look in his eyes said: "You see, this simple sentence has solved a big problem for us."

Zhang Chaoxin also has a technical background and has a deep understanding of the difficulty of the light source of lithography machines.

The difficulty of the light source of the lithography machine lies in the light source generator. It must be a high-power light source. The energy is not enough. The second is the prism. It is necessary to use the refraction of the prism to filter out the light of other wavelengths. Not only in high-precision processing, but also in the material. The level of difficulty is top-notch and requires massive amounts of basic physics research and experiments.

But now, the young man in front of him opened up a new idea with just one sentence.

After the light enters the water, the wavelength becomes shorter, but no one thought of using it on the photolithography machine!

Zhang Chaoxin smiled and said: "Stones from other mountains can be used to attack jade. Teacher Xiao Zhao can wake up the dreamer with just one word!"

He Zhenhua talked about copper wire technology again.

Zhao Guoqing shook his head: "The copper wire process is completely different from the aluminum wire process, and the physical properties of the two are also very different. I have some ideas, but it still needs physical proof!"

"National Day, our Tsinghua University Microelectronics has this condition, you see..."

Zhao Guoqing is helpless. Tsinghua University is too utilitarian. Zhao Guoqing feels that Tsinghua University's goal is to produce a process of 1 micron or shorter, but he is not too concerned about whether it can be commercialized.

Of course, this is also the characteristic of China's current scientific research, and the commercial application of photolithography machines is currently very limited!

Of course it will be delivered to your doorstep, but Zhao Guoqing is not very interested now.

It was already afternoon when we arrived at Chengdu Aircraft. Because of the advance notice, most of Chengdu Aircraft's management were present.

14 Chengdu still attaches great importance to attracting the golden phoenix of Tsing University. The top leader Xu Guanzhuang and many management and technical backbones were born in Tsing University.

Zhao Guoqing saw Zhao Zhongshu at a glance, and Zhao Zhongshu was also very happy to see Zhao Guoqing. After the two parties shook hands and met, Zhao Zhongshu immediately pulled Zhao Guoqing aside.

"Come on, Xiao Zhao, follow me back to the office and show you something!"

"..."

Zhao Guoqing was confused.

It wasn't until Zhao Zhongshu took out a stack of photos to show to Zhao Guoqing that Zhao Guoqing realized that this was Chief Zhao showing him the results of the inspection!

"It's National Day. I regret that I didn't urge you to go with me. If you went, it would definitely be an eye-opener. What is this?"

Zhao Zhongshu pointed to a photo and asked Zhao Guoqing.

Zhao Guoqing almost laughed. He took the photo and pretended to observe it, and said: "This is an airborne radar. There is no receiving terminal on the transmitting terminal in the picture. I guess this is a passive radar." Phased array radar, by the way, Commander Zhao, have you seen active phased array radar? It's more advanced than this."

"?"

"How do you know it's a phased array radar? How do you know if it's active or passive? What the hell, what Grumman showed us wasn't the most advanced one. I knew the foreign devils didn't have such good intentions!"

Zhao Guoqing said: "Phaseded array radar was proposed by Mao Xiong as early as the 1960s. It uses the phase shift of the transmitter to superimpose radar waves to control the emission direction of radar waves. The old-fashioned Doppler radar is still used in our country. Le radar also needs to change the direction of the antenna to emit radar waves, so its flexibility on the battlefield is indeed not as good as phased array radar."

"There really is nothing that can stump you!" Zhao Zhongshu stared at Zhao Guoqing and said, "Guoqing, tell me, what is an active phased array and what is a passive phased array?"

"General Master Zhao, don't embarrass me. I just know a rough idea. The biggest difference between active and passive is the receiving end. The passive phased array radar is the overall receiver. Each transmitter of the active phased array radar It is also the receiving end of radar waves, so just like a fly's compound eyes, it can detect targets more accurately!"

Zhao Zhongshu took a long breath, shook his head and said, "I really don't know what can stop you. Since you know the principle, can you do it?"

Zhao Guoqing thought for a while and said: "General Master Zhao, I think the biggest difficulty of phased array radar is the chip. It requires a computer to control the radar waves emitted by hundreds of transmitters. The transmit time, phase, frequency, and wavelength of each transmitter must be controlled. Precise control, so that they can be superimposed into divergent pulse radar waves..."

"Can that be done?"

Zhao Guoqing didn't say anything. He could draw the drawings, but he really didn't have much confidence whether Tsinghua University could make the chip.

"No matter how much you talk, it's useless. If you can't do it, it's all in vain!"

Zhao Guoqing was very unconvinced by what he said.

"General Master Zhao, if Chengdu Aircraft can import a Nikon NSR-1010G lithography machine, I will give you a phased array radar!"

"..."