Li Shan looked at the vacuum fresh-keeping box, and saw that it was very tightly sealed, and he felt a little strange in his heart, when did he put some items in it for vacuum treatment? Why did he not have any impression at all.

So, he removed the vacuum from the box and opened the lid to see what was inside.

As soon as the box was opened, it was found that in addition to the jade, there was also a stone like a crystal inside.

Li Shan played with this crystal stone in his hand, and couldn't help but think of a middle-aged man named Xu Youjian who he met on the high-speed rail when he came back from a business trip to Shanghai. The money in this bank card was used to treat his daughter, and in the end, Li Shan not only fulfilled Xu Youjian's entrustment and delivered the bank card to his home, but also successfully facilitated the patient's admission to the hospital with his help, and the operation was also successful. This crystal stone was given by Xu Youjian's daughter Xiaodoudou, but now I don't know if she has recovered.

At that time, Li Shan's purpose of vacuuming this crystal stone was to see if this crystal stone could be used in the modified laser gun. Because the laser head on the laser gun he modified was made of ordinary glass, it could not withstand the high energy of the laser in use and often burned out, and Li Shan has not found a good solution to this.

One day, on a whim, he wanted to see if this crystal stone could replace the glass on the laser head.

Since the crystal stone is not easy to process, he put it into a vacuum box for vacuum treatment, hoping to take advantage of the characteristics of the crystal stone after vacuum treatment to become soft and process it into the shape he wants.

Since putting this crystal stone into the vacuum box, due to a series of developments that have happened later, I have forgotten about it.

Now that I am holding this crystal, it seems to be much smaller and soft to the touch, so now is the perfect time to process it into the shape I want.

Li Shan found a magnifying glass in the house to check the color of this crystal stone, because this crystal stone is also a natural material, not as clean as the synthetic one, and there will inevitably be some impurities in it, and Li Shan is ready to use this crystal stone as a laser head, so the requirements for the material are very high.

He used a knife to carefully cut a small piece from the hedron, which was now so soft that it was cut with a knife like a dough because of the vacuum.

The cut spar was carefully inspected for impurities under a magnifying glass, and then irradiated on the spar with a strong flashlight to check its permeability. After that, he cut a small piece again and looked at it under a magnifying glass, and the same inspection procedure, but the result was still not satisfactory, and then he threw the small piece of spar aside.

In a short time, the end of the table was filled with discarded hedrons.

Li Shan originally thought that this walnut-sized spar would be able to get a small piece of it that met his requirements, and what he needed was not big, only the nail cover of his little finger would be enough. But after watching it for a long time, either there are impurities in the spar, or the part without impurities is illuminated with a strong flashlight, and the refraction of the light does not meet the requirements.

Isn't there a single piece of spar that meets his requirements? Li Shan looked at the few spars left in his hand, and couldn't help but feel a little worried.

Fortunately, Li Shan's luck was not too bad, and it wasn't until the center part was left that he found a small spar that met the conditions.

This part of the spar is in the center of the whole spar, I knew that it would be better to directly cut this part of the center and it would be over?

Now the spar is very machinable thanks to the vacuum treatment. Li Shan wanted to take this opportunity to install this carefully selected spar on the laser head.

Beforehand, he had removed the piece of glass from the laser head, and now, according to the size of the removed glass, the hedron was processed into the same size, and then loaded onto the laser head.

Therefore, the laser head modified from the spar is considered to have been modified, and as for what effect it will have, it can only be completed by relying on experiments.

This kind of experiment can only be carried out in a remote place, this remote place, Li Shan's first thought is Qinling, but after several experiences in Qinling Mountain, he is full of doubts about that magical place, so he chose the location of this experiment near the Wei River Beach in the north.

The Wei River, known as Wei Water in ancient times, is the largest tributary of the Yellow River. It originates from Bird and Mouse Mountain in Weiyuan County, Dingxi City, Longxi Province, and mainly flows through Tianshui, Longxi Province, Chencang, Chang'an, Weinan and other places in the Guanzhong Plain of Sanqin Province, and joins the Yellow River in Tongguan County, Weinan City.

There is the Qinling Mountains in the south of the Wei River in the east-west direction, and there is the Liupan Mountain barrier in the north. The Wei River Basin can be divided into two parts: the loess hilly and gully area in the west, and the Guanzhong Plain in the east.

Since ancient times, the Wei River has been the source of water conservancy and the key point of water transportation in Guanzhong, and is one of the important areas for the development and growth of ancient Chinese culture. Especially in the vicinity of Chang'an, it is the capital of Zhou, Qin, Han and Tang, and has a particularly close relationship with the Wei River. The Qin, Han, and Tang dynasties all built bridges over the Wei River to facilitate traffic between the north and the south. In the Han and Tang dynasties, Chang'an had many people, and the supply was huge, and the materials in the southeast were transported, mainly from the Yellow River into Wei to transfer Chang'an.

The Wei River is located in the north of Chang'an City, and together with the Qinling Mountains in the south of the city, it forms a landscape city pattern with Chang'an characteristics. On the premise of ensuring that the embankment of the Chang'an urban section of the Wei River resists the flood of the design standard, and meets the requirements of urban leisure, ecology, landscape and traffic, the construction of ecological embankment and landscape greening within 200 meters outside the embankment line shows new highlights of ecology and sightseeing.

During the day, there are many tourists, but at night, there are basically no people. Li Shan chose the location of the laser gun test here.

After arriving here, Li Shan was not very relieved, he released the drone out, and checked around a few times, but found some tourists, however, those people are some couples, they only care about me and me now, and they don't seem to care too much about everything around them.

At this moment, Li Shan stands on the south bank of the river, looking at the north bank, the river is wide, you can see the north bank embankment at a glance, the lights are dotted, the Wei River is very famous in history, you can see the once magnificent momentum from the wide river, but now the water here has become smaller, and the river has shrunk to less than twenty meters wide.

The original laser gun had an effective range of 1,500 to 2,000 meters, and the widest part of the embankment on the south bank and the north bank of the river was 1,000 meters.

Li Shan placed a few red bricks on the slope of the south bank, and took out a piece of white paper the size of A4, beforehand, he dotted a red dot in the center of the white paper, and then used this red dot as the center of the circle, and drew a few concentric circles, which were used as target paper for testing, and now he pasted the target paper on the red brick, so that such a simple test shooting target was completed.

When everything was ready, he flew to the north shore with a drone mounted on the laser gun, stopped at a distance of 2,000 meters, and could clearly see the red dot on the target paper through the camera on the drone.

Li Shan's camera on this drone has a shimmer function, as long as there is a little glimmer at night, you can see the scene in front of you very clearly, Li Shan controls the remote control, the red dot on the laser sight is aimed at the center point of the target paper, and then presses the launch button of the laser gun.

Li Shanshi was eager to see the shooting effect on the target, and was about to go forward to check it. Suddenly, I thought of something, at this time, the drone was facing me on the north shore, and if I accidentally touched something, and the laser launched pierced a hole in my body, it would be a joke. In order to avoid accidents, Li Shan first turned off the power switch of the attack button on the remote control, and then walked to the target with confidence.

Looking at the target, it was about three centimeters away from the center, and every time the laser gun was remounted to the drone, it would have a rough installation in advance, and then it would be continuously adjusted to produce an accurate shooting effect. And without precise adjustment, such a level was played from a distance of 2,000 meters, which made Li Shan quite satisfied.

Now this kind of debugging Li Shan has already mastered its laws, and it is far from being comparable to the original. At the beginning, in order to be able to debug to the best position, it often takes a day, and now it takes up to half an hour to get it, of course, in the past, every time the laser gun shoots, you need to run to the target to confirm it, most of the time is wasted between the shooting position and the target back and forth, and it is completely on two legs to walk, and now with the UAV platform, I do not use to go back and forth, and the UAV is faster, so it saves a lot of time, plus the mastery of the debugging technology is more and more proficient, and after a while, the debugging of the laser gun is completed。

But this is only the first step in this commissioning, the most important thing is to see if the modified spar laser head can withstand the impact of the powerful energy brought by the laser.

So far, Li Shan has shot a total of five times, including calibrating the laser gun, and in order to test the bearing capacity of the laser head, but he has not found any problems with the laser head.

In the past, when the number of shots with an ordinary laser head reached five times, the laser head would be damaged, and some even only suffered three times. Five times is a bottleneck for the laser head, so when Li Shan was about to test fire the sixth time, his heart was full of apprehension.

Since only the strength of the laser head is now tested, the drone does not need to fly across the Wei River to the north bank for testing, and only shoots at a distance of about 100 meters.

As soon as the sixth shot was completed, Li Shan was eager to see if there was a problem with the laser head. When the drone returned, Li Shan turned off the power of the drone and took it to his eyes to take a closer look.