Chapter 204 Red Light (3k)
It was a toy laser pointer, the simplest kind, without even a ranging function.
In my previous life on the Internet, I saw someone using this laser pointer as a cat-teasing stick.
In the future, basically even the children on the roadside will know about lasers, but its principle was proposed relatively early. As early as 1917, Einstein proposed the concept of stimulated emission of light. The result of radiation is laser light.
But physics is often like this, and many theories may go faster than practice.
It was not until 1958 that the principle of the optical stimulated emission amplifier was completely perfected.
In 1960, scientists from Citigroup's Hughes Aircraft Company produced a ruby laser and officially announced its success in July.
Yes, this thing is not made by universities, military, research institutes, etc., but by Hughes Aircraft Company, the prototype of the movie "The Aviator" starring Leonardo DiCaprio: Howard. Hughes Company.
my country has also carried out laser-related research very early. Just one year after the birth of the first ruby laser, in November 1961, my country’s first ruby laser was born. By 1963, my country’s helium-neon laser , neodymium-doped glass laser, and gallium arsenide laser were all developed. In 1965, our country successfully developed a carbon dioxide laser. .
This is also the reason why Gao Zhendong did not turn his attention to lasers at the beginning. We made this thing very quickly. There is no need to waste this time and wait for the big guys to study it and then use it. .
An interesting fact is: the laser rangefinder is one of the few new technology equipment on the second-generation tanks that has no glitches. This is evident from the early start of laser technology in our country and the maturity of the technology.
Although he thought not to do it, now that he has this opportunity, Gao Zhendong thought for a long time and decided to get the honor of the world's first laser into our hands. Anyway, we have already paid the patent fee. It has been handed in long ago.
This will be of great benefit to both expanding our scientific and technological influence in the world and Gao Zhendong himself.
As the saying goes, if God gives you nothing, you will suffer. Since the system has given it, it doesn’t seem to be a good idea not to accept it.
What Gao Zhendong extracted was a not particularly large cylindrical box with a base. There was an optical window at one end of the box, from which the laser should have emitted.
Gao Zhendong didn't bother to read the other parts of the manual carefully. He just read the operating instructions carefully, then quickly took the laser to the south room, connected the laser to the power supply, and turned off all the lights.
As soon as Gao Zhendong turned on the switch, a beam of red light shot out from the optical window of the laser.
This is the world's first laser!
At this time, Citigroup's laser should not be able to emit laser light. The span from February to July is too big. They can't build it in February and then announce it in July.
Gao Zhendong looked at this red light with fascination, and he felt a little excited. If other things are not his first time in this world, then this thing is really walking in the world. At the forefront of the world.
Laser ranging, laser guidance, laser scanning, laser communication, laser processing, laser killing. Even - laser confinement nuclear fusion.
Thinking too much, thinking too much, that thing is not what I should be thinking about now. Gao Zhendong, who almost drooled, shook his head and forcibly stopped his thoughts.
In terms of originality, transistor computers are only a subdivision of computers, and they are not number one from a world perspective. Materials are too specific to be number one.
But lasers are different. It is something that Einstein predicted but has not yet confirmed. It is quite stylish when you think about it.
Lasers are only engineering realizations of various laser research theories, not theoretical research. However, the inventor of Citi's first laser was nominated for the Nobel Prize. Although he did not win the award, it can be said that importance of this invention.
It's February now, and there are still many months before the day when Citigroup's laser successfully shines in my memory.
And I already have a laser that can emit light normally.
More than three months! It's too late, even if it's to explain the source and do the relevant cover-up work.
Looking at this beam of red light, Gao Zhendong was stunned for a long time, then turned his head, turned off the power of the laser, turned on the light in the south room, took the laser manual and read it carefully.
It is similar to what Gao Zhendong guessed when he saw the color of the laser beam. This is a ruby laser with a very simple structure. The laser rod uses aluminum oxide doped with chromium.
Aluminum trioxide is the main component of rubies and sapphires, so it is called ruby laser. Just like diamonds are made of carbon and crystals are made of silicon dioxide. Putting aside those artificially added attributes, many gems are not worth much. money.
The troublesome thing about lasers is the principles, which can only be studied and expressed by experts in theory.
As for the laser itself, a laser that emits light is actually not complicated.
Gao Zhendong even remembers seeing a back issue of a youth science magazine in his previous life, which contained an article teaching junior high school students to make their own laser, one of the most important parts used to discharge the excited gas to emit the laser. , is a screwdriver. The reason for using a screwdriver is that it is more convenient to adjust the discharge gap. It is also specially noted that a flat-blade screwdriver is suitable, as the cross screwdriver is easy to roll.
Yes, the popular science magazines at that time were so hardcore. Citigroup's first ruby solid-state laser looked very simple. The core was a ruby cylinder as a laser rod, and a spiral light tube on the outside. This light tube was used as a light pump.
To put it simply, a solid-state laser is a light pump that irradiates a laser material (laser rod) and excites the laser material to emit laser light.
Unlike many lasers in the future that generally have a focusing cavity outside the optical pump and laser rod, the Citigroup laser does not have a focusing cavity, or it can emit laser light without a focusing cavity because of the spiral The shape-wound optical pump plays a role similar to a light focusing cavity.
Although the one Gao Zhendong has is also a ruby laser, its structure is different. The structure of this laser is also very simple. It uses a silver-coated focusing cavity. The cross-section of the focusing cavity is an ellipse, and the ruby laser rod and optical pump are located at the two focuses of this ellipse.
This ensures that the excitation light emitted from the optical pump at one focus can be fully reflected to the laser rod located at the other focus.
On the two end faces of the laser rod, one end face has a total reflection mirror, which ensures that the light emitted from this end can be reflected back to the laser rod.
Some lasers have a semi-reflective or partially reflective lens at the end of the light emission, but the one Gao Zhendong has does not have it. Maybe it is to save some craftsmanship. It is a prototype, as long as it can be used. .
As for the common cooling system of lasers, high EQ says it uses gas cooling, while low EQ says it relies on air flow to dissipate heat. An active heat dissipation system? No, neither does the filter system. The prototype laser is not so particular.
Since ruby is used as the laser rod, this should be the same pulse laser as the Citiman one.
Although the light appears to be continuous, it is actually a laser excited by a rapid flash. Ruby laser has good energy storage and high output power. The peak power can reach tens of MW, but the pulse width is only tens of nanoseconds.
Since it is a pulsed laser, it is perfect for distance measurement.
However, ruby laser has poor monochromaticity, but this problem is not a problem at all for Gao Zhendong. What I want is a laser, not a monochromatic laser.
Monochromaticity is not what we need to consider now. If the monochromaticity is poor, can it be impossible to measure distance? Although the monochromatic property is poor, it can still be used for guidance.
In general, the principle of this laser is the same as that of Citigroup a few months later, and the type is the same, but the details are different.
That’s even better, it looks so much like Gao Zhendong that it’s hard to explain.
Gao Zhendong put away the manual happily, turned off the light, and played with the laser like a child.
This thing is quite small and can be easily moved around like a laser pointer.
All it takes is a cat, otherwise it would be fun to tease a cat, Gao Zhendong thought with a hint of regret.
Outside Gao Zhendong’s house, a figure with a slight limp walked into the front yard.
As soon as I looked up, I saw red light spots flickering on the window of Gao Zhendong’s south room. There was nothing I could do about it. No matter how weak the laser was, it was still a laser. If it hit the airtight thick curtain, it would still cause damage to the back. Give some clues.
There’s no need to guess about this figure, it’s in the middle of the bangs.
He saw the mysterious light spots flickering on the window of Gao Zhendong's house. He looked happy and wanted to go over and lie under the wall. He was very familiar with that place. If he didn't blow it, he would just push it down. Find the most comfortable sitting position.
However, after taking only two steps with a limp, Liu Haizhong touched his legs and stopped.
He almost gave himself two big mouths, bangs in the bangs, bangs in the bangs, is that the big Buddha that you can move now? Have you forgotten your legs?
He turned his head and glanced at Gao Zhendong's window hatefully. One day, I will be an official. Let's see how I can make up for it!
Thirty years in the east of Hedong and thirty years in the west of Hexi. Don’t be deceived. Ah, I’m sorry, it’s a conspiracy.
Anyway, Liu Haizhong turned his head and walked home with a bit of hatred. When he reached the middle courtyard, he spat on the ground angrily, "Bah!"
Gao Zhendong, who had had enough fun, put away the laser and thought about the next thing.
In fact, the laser is ready-made. He just needs some explanation. Everything else is easy to explain. It can be made in a factory or even buy the materials for processing by yourself.
After all, what he wants is proof of the laser trial production process, to prove that he has indeed spent time trial producing every component of the laser. However, the products of these processes are actually not used at all, and the finished product must be used directly. Just have this extracted laser on hand.
(End of this chapter)