It should be repeated that before Hu Wenhai was reborn, he worked as the chief process engineer of BYD's semiconductor factory in Ningbo.

Ahem, as a former employee, Hu Wenhai actually admires Wang Chuanfu. If you really want to say that Wang Chuanfu should be somewhat similar to Huawei's Ren Zhengfei, both of them are leaders in private companies, and they are both a little silent in China. But in their respective fields, they have always pursued the advancement of technology.

Let's just say that BYD's Ningbo semiconductor factory turned out to be just a mess that no one took over in Ningbo Zhongwei. At first, it was at the level of the 80s that TSMC was used, and later a batch of second-hand production lines with 1.5 micron processes were eliminated and transferred from backward production capacity. By the time BYD bought the plant in 2008, the line had been in operation in Ningbo for at least a decade, but the yield was only 40 percent.

The benefits it has created can be said to be blind to the preferential treatment given by Ningbo and the high hopes placed on it.

It was under such pressure that Wang Chuanfu spent a huge amount of money to take over this mess. The first thing he did was to improve the machining accuracy to the sub-micron level of 0.8 on the basis of the 1.5 micron process.

In the following years, Wang Chuanfu's investment became greater and greater year by year. Its investment in fab technology upgrading is even ten times higher than the original purchase price!

Finally, we can be very proud to say that BYD's latest electric vehicle "Qin", the key IGBT power driver chip, is produced by BYD's Ningbo factory! And this technology can only be mastered by Infineon in the world, and BYD is also the first Chinese company to master this technology! For this reason, BYD has established a leading position in the field of domestic electric vehicles!

Ahem, I'm very embarrassed to say that in the process of achieving this result, Hu Wenhai's contribution is more or less there. In particular, in the process of upgrading the 1.5 micron to 0.8 micron process, he was involved in the improvement of the wafer production line.

From lithography machine to etching machine to meteorological precipitation CVD, from front-end process to film plate making, from circuit design to production arrangement, the yield rate of less than 40% has been increased to more than 95%.

Hu Wenhai has gone through all these technical routes from scratch, and all kinds of designs and parameters are in his head. In order to sit firmly in this position, he even studied as a graduate student in optical engineering at Huake.

Q, what is the most important piece of equipment on a chip production line? The answer is definitely only one thing, and that is the lithography machine. Simply put, it is a device that uses a laser through a mask to engrave circuits on a chip.

Therefore, it is conceivable that Hu Wenhai has a little research on lasers more or less modestly. As for military lasers, as a pseudo-military fan geek, I haven't eaten pork, and I haven't seen a pig run?

Yttrium aluminum garnet crystals, when irradiated by high-energy flashes and condensers, are capable of emitting laser light with a wavelength of 1.06 microns. Don't underestimate this short line of data, just these 40 words, put it in the world in the seventies, it is not a problem to sell tens of millions of dollars.

Because, this is the laser that humans have found so far, which is relatively suitable for propagating in the atmosphere. It is slightly worse than the atmospheric propagation performance of the carbon dioxide laser, but because it is a solid-state laser, it can be very small, and the application volume in the war is obviously a more important factor.

The solid-state giant pulse laser excited using yttrium aluminum garnet was experimented with little by little in a myriad of possible laser excitation schemes. Even in the early 80s, only the United States, Britain and France had this set of data.

The newly established optoelectronic laboratory of ST still has some foundations, such as the power circuit device used to drive the LD chip, Hu Wenhai took the time to draw a diagram in the afternoon, and asked Baishi to prepare the components and install them on the spot.

We can even build IGBTs, let alone electric drive circuits for driving LD chips. The so-called LD is one letter different from LED, and the actual meaning is not much different. LD is the abbreviation of semiconductor laser (LaserDiode), and like LED, it can realize photoelectric conversion. In layman's terms, the light generated by LEDs is divergent, while the directionality of LD light emitting is much better.

There is a high-power LD chip, which uses a concentrator to excite yttrium aluminum garnet crystals, which is the core technical basis of laser target designation in modern laser guidance methods.

The next thing to do is to encode the laser through the electro-optical Q-switched shutter, which is a device similar to blinking an eye, which allows the laser to flash at different frequencies every second - laser-guided weapons can't always see a beam of light and give a kiss, they always have to recognize their own frequency.

Then the laser light is refracted with various prisms, and finally through the filter and the front-end emission telescope, a modulated laser that can indicate the target is built.

That's right, what a seemingly high-tech laser-guided target designator, in fact, the principle is as simple as that. And in fact, in the future, laser guidance will enter the thousands of households of ordinary people. Think about it, the infrared remote control at home, sometimes even in the opposite direction, you can still remotely control the TV to change the channel, that is, the TV receives the scattered signal of infrared light on the surface of the object.

The U.S. military's well-known "Paveway" laser guidance system is essentially no different from these things.

As an aside, many offices have automatic fire extinguishing detection heads for fire alarms, which are a deteriorated version of the infrared homing head.

The scientific and technological progress triggered by the threat of war has long been unconsciously benefiting the whole society!

But then again, as the most used guided weapon system by the US military, it is not cheap and simple, and the Pentagon may not be able to afford it.

Hu Wenhai purchased commercial semi-finished products in the United States this time, which saved him the trouble of starting from scratch. With mature design ideas and specific weapon data, the difference is like soldering a computer from capacitors and buying a CPU, memory, motherboard, and hard disk and assembling a computer.

The latter is naturally countless times easier, but combining a computer with the highest cost performance also requires countless people to dedicate their wisdom to it.

Hu Wenhai simply didn't even save this step, and he could directly come up with the most acclaimed installation list of Computer Home.

"Yes, here the condenser is set up in front of the LD chip to concentrate all the light on the yttrium aluminum garnet laser bar. Hu Wenhai lined up the equipment on the table, explaining their specific functions and uses to Baishi one by one. Then, on the whiteboard hanging on the wall of the laboratory, the working drawing of the entire laser target designator was drawn with an oil-based pen.

"Then the laser is introduced into the Pukel electro-optical Q-switched shutter box through the prism, and finally enters the laser output prism through the polarizer, do you understand?"

Shiraishi lifted the thick-framed glasses on his nose, carefully compared the functions of the real objects on the table with the functions of each part of the schematic diagram, and asked questions that he couldn't understand as he looked.

It took an afternoon for Shiraishi to memorize almost the entire notebook, and only then did he hesitate to say that he had understood all the points of the entire design.

"But Mr. Hu, if you use it on the battlefield, do you still need to pay attention to shockproof, waterproof, dustproof and other measures in the design?"

Hu Wenhai waved his hand and said generously: "Don't worry about this, your task is to develop this system first." As for the final weapon structure design, we don't have to worry about it. ”

This is the difference in the perspective of the two people, Hu Wenhai did not think that this kind of semi-finished guidance system that cannot be mass-produced will be sent to the battlefield so soon.

Heng Jianyun's company is still on the front line in Annam, and it is impossible for him to come back to change his clothes, nor to accept the equipment made by Hu Wenhai for no reason. At this time, we can see the benefits of wearing a layer of skin for the military industrial unit of the 501 factory, as long as the weapons and equipment are produced, the militia company of the 501 factory can be equipped in minutes.

Originally, the 501 factory, which had more than 3,000 people, had a militia battalion, but now two-thirds of it has gone, and there is only one company left in the militia.

But it doesn't matter, when the equipment research and development is completed, the militia company has formed a combat effectiveness. With the relationship left by Heng Jianyun, he can contact the senior leaders of the Shengjing Military Region and give Hu Wenhai a chance to perform.

Ahem, then again, even if there is no relationship with Heng Jianyun, now Hu Wenhai can go to meet the big leaders of the Shengjing Military Region at any time, who will not be greedy for twenty F-14s!

In other words, eighty percent of these first batch of laser-guided weapons will be thrown at the test site. In this case, there is no need to rush into any shockproof, waterproof and dustproof measures.

When the interest of the PLA is seduced, the weapon system design will naturally be done by professionals, and Hu Wenhai has no intention of choking on the military industrial system.

At that time, the company can fully supply parts, and other military factories will provide assembly and commissioning. If you have money, everyone earns it together, which is much safer in the military industrial system than eating alone.

Let's make money, and the face of meritorious service and awards will naturally be received by units in the system. Both sides were happy, and Hu Wenhai was so happy that he made a fortune.

Just explained his entire train of thought to Baishi, Hu Wenhai raised his hand and looked at his watch, and it was already five o'clock.

Thinking of poor Yu Shiwei being thrown in the factory by himself for an afternoon, Hu Wenhai hurriedly packed up his things and walked out of the small building of the technical department.