roccoschili Page 618
Page 618
Laser Group [-] is the laser hard-kill weapon group. This group...do not expect them to produce products. After graduating from a master's degree in three years, they were sent to the Soviet Union to work with the Soviet laser weapon design bureau.
Only the three laser groups, the optical storage research group, got stuck.
……
Department of Physics, Tsinghua University, Laboratory Building.
Two classrooms were connected to create a super-large laboratory, which is densely packed with various experimental equipment, materials, tables and chairs, so that you have to shrink your head when walking in some places.
On the test bench crowded with people, Sun Liangfang, the leader of the third laser group, and Yao Yanqi, the deputy leader, opened a flat box and carefully took out a round shiny plastic piece from it.
The diameter of the plastic plate is 20 cm, a little bigger than a palm. It is said to be made of plastic, but the surface looks like a silver metal film.The six pairs of eyes in front of the test bench were all fixed on the plastic plate and the hands holding it, as if they were looking at a ten-generation single-passage baby.
Sun Liangfang pressed an instrument in front of him, and a small drawer popped out of the instrument. Sun Liangfang gently put the disc on the drawer, and then closed the drawer.
"A sky above your head, a foot on a piece of soil, you hold your head up in the wind and rain, and the ice and snow are overwhelming."
"It's such a big tree that you can let the wind blow. How many stories are left in the green leaves? There are joys and sorrows."
……
"Successful!" "Successful!" "Successful!"
The 6 members of the entire laser group three cried out in surprise.
The sound of "What a Big Tree" sung by Zhou Xuan echoed throughout the laboratory. The quality of the speakers is not bad, and the sound quality is naturally excellent.
During the singing, Sun Liangfang and Yao Yanqi hugged each other and cried. "Seven years, four years of extension! We can finally get a degree!"
"I don't know how I got here for seven years!"
……
In 1951, the third laser group was established. When the school started in September, the three groups discussed for more than half a year, thinking that if a very small laser beam is used to irradiate a plane with grooves or flanges, there will be differences in the reflection of the laser light, and this difference can represent 9 and 0.
Tang Hua gave an affirmative reply, thinking that this research direction is correct.Then the three laser groups spent a year and a half to obtain a small ultra-fine laser with a wavelength of 780 nanometers.When the ultra-fine laser was successfully developed, the storage carrier was also determined, and there was a circular metal disk with a rotatable axis in the middle.
After half a year of gnawing on the round metal plate, I finally thought that the production was not easy. The grooves on the exposed metal plate would be damaged quickly, covered with a transparent plastic layer, and the bond with the metal was not strong. In March 1953, the three laser groups gave up metal discs and turned to hard plastic discs.
In 1954, the third laser group finally found a manufacturer in Suzhou that could produce hard plastic discs. At the end of 54, for the first time in the laboratory, 2048 binary numbers were pressed on a hard plastic disk, and the disk reader read the 2Kb data into the computer hard disk at a rotation speed of 2 seconds.Data is written on a circle of the disc, which is read in a loop.
Seeing that success is just around the corner, Laser Group 30 and Zhao Zhongyao reported the progress to Tang Hua. Tang Hua replied: The disc must hold your teacher's wife's entire LP album with highly realistic sound quality. Failure to do this is not considered a conclusion problem; the data reading speed of the disc is not enough, not 500 revolutions per minute, but [-] revolutions per minute, which is only the lowest benchmark speed.
Of course, Tang Hua was not helpless at all, and soon sent a 44.1KHz sample collection program for the sound, a coding standard, and a double automatic correction coding error correction system.In addition, they can seek technical and product support in the factories and research institutes of the Electronic Information Industry Bureau.
In this way, year after year passed.
After 1954, the physics department knew that the third laser group had stepped on a big hole, and it was impossible to get out after entering it. Graduated undergraduates avoided the laser third group laboratory and refused to apply for graduate students in the third group no matter what.So up to now, there are a total of 6 members in the three laser groups: 4 first-generation members of the 51st class, 1 member of the 52nd class, and 1 member of the 53rd class.
At the hard disk factory in Suzhou, the laser three groups got inspiration from the magnetic head of the hard disk.However, during the investigation of the hard disk factory, they were horrified to find that the music stored on the CD is stored in the form of binary numbers. Simple calculation, if the optical storage system is successful, a piece of plastic with a diameter of 30 cm can store more data than the Suzhou hard disk factory. A gasoline can is as big as a hard drive!
This discovery both horrified and excited the three groups of lasers.Not long after, a new blow came: Tang Hua thought that the plastic piece with a diameter of 30 centimeters was too large and had to be changed to 20 centimeters, and a music album had to be stored.
Keep crawling in the dark.
Although there are still 6 people in the third laser group, in the past few years, nearly 10 units have cooperated with them, and more than 20 factories have established cooperation and supply contracts. Moreover, although nothing has been produced, the third laser group Funding is always guaranteed.
In 1957, the third laser group first obtained a small number of data processing chips with a 6-micron process, and the entire system began to be integrated, and the long research work finally saw the light.
……
"Why do you look like you are escaping from a sea of hardships?" Tang Hua said with a smile, "What I said at that meeting was: Your research group is a combination of master and doctor. It is now June 1958, three years of master's degree... four years Years is not too much of an exaggeration."
Sun Liangfang: "The other groups are progressing very quickly. The first group made things according to the requirements in half a year. They have a master's degree, but you can also say that the second group is a combined master's and doctoral student. But Zhou Guangzhao realized laser digital communication in one year. Three Even the fiber optics have been laid in the year. We are very anxious."
Tang Hua: "However, I see that your project is progressing in an orderly manner. There is anxiety, but there is no panic. This characteristic is particularly commendable. In addition, I actually did not give clear instructions, but you actually put The entire industrial chain is connected, so many factories have established a cooperative relationship, and the design of scattered parts is distributed to various units of the Electronic Information Industry Bureau, which is a very good idea for engineering research.”
Yao Yanqi: "Actually, we have a small number of manpower, and we don't have expert testers. It is always impossible to make ultra-fine parts by ourselves."
Tang Hua: "That's right, it's not bad. Since the entire industrial chain is strung together, this product can be mass-produced after simple industrial design and beautification. In the near future, it will be able to compete with compact record players. , and will eventually replace the record player. After graduation this year, your third laser group will be used as an independent laboratory, which can be affiliated with Tsinghua University or the Electronic Information Industry Bureau. Then, there will be new tasks.”
Sun Liangfang: "What new mission?"
Tang Hua: "A platter with a diameter of 20 centimeters is still too big. Make it 12 centimeters. The storage capacity remains the same."
……
The time has come for lasers to gradually reveal their secrets to the world.
The 1951 paper only disclosed the laser principle. The principle experiment is to irradiate rare earth crystals with neon lamps, which can produce natural laser light (always converged but the light intensity is not strong).The actual laser was not announced.But the original history line, in 1960, Maiman of Hughes Laboratory made the first ruby laser that meets the modern definition, and then the research on laser gradually spread.
Of course, announcing the secrets of the laser is not for the sake of bragging, but to confirm the inventor as an iron case, and then grab the patent—even if you can’t get money for filing a lawsuit in Western countries, you must occupy the commanding heights of the patent for future convenience. pull list.
After the laser is not a secret, many products are also gradually available for export.And it is a high-profit export list.
This is something that should be done in a year or two.Tang Hua is still in a good mood now, and there will be CDs to listen to in the future.
If we work harder, the technological elements in this era can continue to increase.
Xinjiekou.
During working hours, there are not many people on the street, there are pedestrians pushing carts in twos and threes, and pedestrians driving horse-drawn carts to transport garbage, except for the occasional car passing by.
"This tower is a bit close to the electric pole. There will be no problem when working, right?"
Tang Hua asked Li Qiang.
"Although the pole is high, it is not a high-voltage transmission line. It was only raised to avoid tall buildings," Li Qiang said. "The electromagnetic interference of non-high-voltage transmission lines is not strong."
Tang Hua: "The gate building of Deshengmen is actually very suitable for adding an iron tower, but it is a pity that the cultural relics department does not allow it."
Li Qiang: "At present, four base stations in Beijing are enough. After all, it is a test, and there are only 100 numbers. ... Hey, it is already 10:[-], and the base station system should have been powered on."
……
Tang Hua, Li Qiang and his party walked southward for more than 500 meters, trying to stay as far away from the base station as possible.After standing still, Tang Hua took out the things in the bag.a brick.
...a phone that looks like a brick.
Strictly speaking, it is smaller than the Motorola DynaTAC 1973x in 8000, the pickup is not raised, and the keyboard lacks a row of special function keys, but the half-foot-long antenna is still retained.
"This mobile phone is full of new technologies, and there are too many integrations." Li Qiang said.
"Anyway, even if you use old technology, not everyone can afford it. We are just doing a mobile communication test," Tang Hua said. "Besides, the basic law of the electronics industry is that the prices of all components will decrease over time. , ten years later its cost will drop a lot, and its function will be much stronger than it is now."
Turn it on, the battery is only enough for one hour of talk, but now it is fully charged.
Who should I call?