Focus on type competition, win, the door opens.
He Xin said: "It's not easy. We focused on this type of competition. The score was tied for the second time, and we won with a slight advantage of 3-2."
Xiang Yu said: "Fortunately, the speed of light is not adjusted very fast, otherwise we wouldn't be able to defeat them."
Instantaneous said: "If the speed of light is adjusted too fast, we won't be able to react."
"If the adjustment is too slow, under the same conditions, the robot's recognition and calculation speed will be very fast."
He Xing said: "In terms of movement, humans are not as fast as robots. Mainly in complex environments, humans are still slightly faster than robots in image recognition."
Xiang Yu said: "In terms of fine movements and non-repetitive movements, robots are slower than humans."
Enter the next large room. There are several small rooms in a large room.
The first room is brighter, with blue walls tinged in white. The barrier wall is curved and the mirror is turned so that the laser light source shines on it. According to the angle of reflection equal to the angle of incidence, the light is reflected in another direction. Find another mirror, catch this beam of light, and reflect it again. If a ray of light goes forward directly, it will be blocked when it reaches the wall, leaving only a light spot on the wall. After several reflections from the mirror, it is transmitted in the middle direction. Finally, the light is guided to shine on the light receiver of the rectangular box, allowing the exit door to open before you can go out.
Hexin said: "Can you use our mercury lamp to turn on the switch?"
Instantaneous said: "No way. The laser used here was originally." He tried, but the mercury lamp still didn't work.
In the interaction between light and atomic systems, spontaneous emission, stimulated emission and stimulated absorption exist simultaneously. To obtain more and more intense light and produce more and more photons, it is necessary to produce more photons by stimulated emission than absorbed by stimulated absorption. Under the action of photons, atoms with high energy levels have the same chance of producing stimulated radiation as atoms with low energy levels produce stimulated absorption. Whether light amplification can be obtained depends on the ratio of the number of atoms in high and low energy levels.
If there are far more atoms in high-energy states than in low-energy states, you get highly amplified light. However, under thermal equilibrium conditions, the distribution of the number of atoms according to energy levels obeys the Boltzmann distribution law. The number of atoms in higher energy levels is always less than the number of atoms in lower energy levels. Atoms are almost always at their lowest energy level. In order to obtain light amplification, we must look for it in a non-thermal equilibrium system.
Only when there are more atoms in higher energy levels than in lower energy levels can stimulated radiation prevail over stimulated absorption. It can be seen that the key to making the light source emit laser light instead of ordinary light is that the number of luminescent atoms in high energy levels is greater than that in low energy levels. This situation is called particle number inversion.
Particle number inversion requires the use of activation media. It is a substance that can cause the particle number inversion between certain two energy levels. It can be a gas, solid or liquid. To obtain particle number inversion, a multi-level system must be used.
The laser consists of the following 3 parts:
Laser working medium: The generation of laser must select a suitable working medium, which can be gas, liquid, solid or semiconductor. The key is to be able to achieve particle number inversion in this medium to obtain the necessary conditions for generating laser light. Obviously, the existence of metastable energy levels is very beneficial to achieving particle number reversal.
Excitation source: In order to reverse the particle number in the working medium, a certain method must be used to excite the atomic system to increase the number of particles in the upper energy level. There are electrical excitation; light excitation; thermal excitation, chemical excitation, etc. Various stimulation methods are figuratively called pumps. In order to continuously obtain laser output, pumping must be continued to maintain more particles in the upper energy level than in the lower energy level.
With appropriate working materials and excitation sources, particle number inversion can be achieved, but the intensity of stimulated radiation produced in this way is very weak. The radiated light also needs to be amplified.
Resonant cavity: At both ends of the laser, two lenses with high reflectivity are installed in parallel, one is a total reflection lens, and the other is a partial reflection and a small amount of transmission lens. The function of the total reflection lens is to reflect all the incident light back according to the original path. The function of the partial reflection lens is to reflect back some of the photons whose energy does not reach a certain limit according to the original path, while the photons that reach a certain energy limit are transmitted out. The transmitted photons become amplified laser light; the light reflected back to the working medium continues to induce a new round of stimulated emission, and the light will gradually be amplified. Therefore, the light oscillates back and forth in the resonant cavity, causing a chain reaction, amplifying like an avalanche, and generating intense laser light until the energy reaches a certain limit and is output from the partially reflective mirror.
Walking towards the middle, there is a switch box in the middle, and the walls are round and round, like a snail's shell. Turning the middle mirror directs light to the switch box. After adjusting to the appropriate position, the final light will circle around and reach the switch box. Open the door to the room.
Second room. There is a hot light source emitting light. Several blocking walls are arranged horizontally, and the mirrors are rotated so that the light source shines on them in another direction. Find another mirror, catch this beam of light, and reflect it again. If a ray of light goes forward directly, it will be blocked when it reaches the walls on the left and right, leaving only a light spot on the wall next to it. After several reflections from the mirror, it is transmitted towards the exit. Finally, the light is guided to shine on the light receiver of the rectangular box, allowing the exit door to open before you can go out.
The characteristics of the thermal light source are that the spectral distribution, emission, and brightness can be estimated using Planck's formula. It emits a continuous spectrum with a wide spectrum width and strong adaptability. Most of them are electric heating types, and the luminous characteristics can be controlled by controlling the input power. Thermal light sources are generally used as light sources for photoelectric detection, white light interference, standard light sources or standard radiation sources, and are used for the transmission of measurement standards.
A switch box is behind two walls, and the mirrors at the four corners can be rotated to guide light to the switch box. The light needs to be reflected back and forth on the mirrors on the two walls and finally reach the box.
They entered the next door and saw some machines placed here. This should be the electromagnetic device detected. Used to set the speed of light and slow it down. And generate medium gas. These medium gases fill these rooms outside.
The speed of light here is slowed down using electromagnetic induction technology. Electromagnetic induction technology means that there is a large refractive index change at the resonance frequency of the medium, which can effectively slow down the propagation speed of light.
A beam of detection laser serves as a signal and irradiates on some optically opaque media, and the signal beam cannot pass through. Another coupled laser beam with different frequencies is used as a control beam and irradiated on this medium at the same time. Due to the function of the control beam, the signal beam propagates in the medium without attenuation, or the transmittance is greatly improved, making the medium that was originally opaque to the signal beam become a transparent medium. Slow light can be realized in metal gases, rare earth doped materials, optical fibers, and photonic crystal waveguides.
If the frequency difference between the detection laser and the coupling laser is tuned to be strictly equal to the Raman transition resonance frequency, then the atoms and the radiation field will interact. Electromagnetic-induced transparency allows people to observe that the dielectric constant is very close to the resonance transition, which can be deduced that the speed of detection light in the medium slows down.
He Xin said: "I wonder who put the machine here?"
Xiang Yu said: "Putting it in this ice and snow, it also belongs to a secret experimental base."
He Xing said: "What can this thing be used for?"
Instantaneous said: "Should we slow down the speed of light to prevent the opponent from using any laser weapons? When the speed of light slows down, we can see the direction of the laser, and we can block or avoid the laser."
Xiang Yu said: "Slowing down the speed of light is used to store some information."
He Xin said: "It is probably to record the information that came from somewhere."
Instantaneous said: "I have always believed that the speed of light cannot be changed. It is also the fastest."
He Xing said: "But I didn't expect that there are so many things that can be changed."
Xiang Yu said: "I think it was done by people from the Institute of Optics. Who else has this technology."
He Xing said: "It should be. But who?"
Shunpin said: "These are the people. Let's investigate one by one."
He Xin said: "Then don't alert the enemy first. This place is so hidden. If you ask directly, you will definitely not admit it."
Duan Zhu and others also came to Bingcheng.
Duan Zhu said: "He Xin, are you here too?"
He Xin said: "I'm working here."
Duan Zhu said: "I don't know about the gravity stone. Have you studied it?"
He Xin said: "The research will not be clear for a while."
Duan Zhu said: "What are you busy with now?"
He Xing said: "For detection, we use the spectrum of ground objects for earth observation and the mapping network for the sky."
Duan Zhu said: "What does the mapping network do?"
He Xing said: "Mapping from one space to another space to detect."
Duan Zhu said: "Then what equipment is needed?"
"There are many types of mapping devices, some that do close detection and some that do long range detection," Hessing said.
Duan Zhu said: "Can we detect the things in this gravity stone?"
He Xin said: "Are you anxious about this matter?"
Duan Zhu said: "I'm not in a hurry, I'm just asking."
"Because it also takes a long time to build a mapping network," Hessing said.
Duan Zhu said: "That's not urgent. Let's wait until you have time. I have a holiday recently, so I will come here for a walk."
He Xin said: "You can see the ice sculptures and snow-capped mountains here. There are some special B&Bs where you can live and sightsee. There are some agricultural greenhouses where you can pick vegetables and fruits. There are also ski resorts."
Duan Zhu said: "There are so many fun things."
He Xin said: "But don't go too deep into the snow-capped mountains. We have also seen ice apes and snow leopards. There are also some thin ice layers that are easy to fall into."
Duan Zhu said: "What is this? I've never heard of it."
He Xin said: "The ice ape is relatively tall, about 4 meters tall. It eats bark and the like, but it will probably hurt you when it is angry. The snow ape is relatively light and can crawl on the ice, but it is carnivorous. Yes. Condensed ice is very thin and can be molded into different shapes, and you can also make ice sculptures. I don’t know who laid it in the mountains, but it is like a trap. It looks like snow outside, but you will fall when you step on it."
