Laser spatial distribution measurement is an important branch of the laser measurement system. It is mainly composed of two parts: the near field distribution of the laser beam and the far field distribution of the laser beam. With the development of laser science, the spatial distribution of violet laser pointer beam is more and more attention. In the history of the development of high power lasers, the spatial distribution of laser beams is the most important field, and its level determines the level and scale of laser devices to a great extent. Laser time measurement is mainly real-time monitoring of the final device output pulse laser waveform, each time the laser target to reach the bulls at the same time the time synchronization measurement, and ultra-short pulse test laser time measurement.

High-power lasers can produce large amounts of energy, causing some metal to evaporate. In the process of melting, the density of the steel will decrease rapidly and the volume will increase accordingly, and the movement of the material will increase, resulting in high pressure steam. At this time will produce a 'keyhole', it is the high power laser impact point on a narrow hole. The steel around the hole melts to form a pool. After the liquid steel cools, it will connect two sheets of sheet metal. The fundamental cause of most mechanical failures is the presence of defects in the weld, since the weld points are connected to different materials. If the connection is improperly handled, it will eventually cause the stress to be too large. Improper welding parameters may also cause instability of the welding point, resulting in welds in the pores, part of the penetration or undercut, resulting in the connection is not strong.

To provide customers with the right laser tailor-welded blanket, you need to choose the correct combination of welding parameters. By adjusting the grade and thickness of the steel plate in order to meet the customer to meet the vehicle crash test specifications, weight requirements and cost requirements of the burning laser tailor welded blanks. A series of process conditions are determined by simulation to ensure that defective welds are produced. Knowing the physical phenomena of these interactions and coupling them together for simulation, rather than doing multiple studies in parallel, gives us a great deal of convenience. Has been committed to helping the automotive industry to reduce the weight of the body and to ensure that the welding products have excellent quality, so as to protect the driver in the safety of driving a car.

The use of advanced high-strength pressure hardening steel, the installation of the steel plate was optimized, so that the specific area of ​​the car to maintain the strength of the performance at the same time more thin. Ultimately, it is desirable to achieve excellent welding quality to ensure that the welding meets the safety requirements of the crash test. A safe welding can not be broken or broken during the test, otherwise the weldment will not pass the safety test. The use of laser welding of concentrated heat source will be converted into molten metal molten steel, used to form a narrow and deep weld.

Laser time synchronization (equal to the optical path) measurement, refers to the multi-beam laser synchronization to reach the target time measurement, laser pointer beam target power balance is an important guarantee. According to physical calculations, if the two beam synchronization time difference of 25 ps will lead to 10% power imbalance. And the power balance is extremely important for achieving uniform compression of the target. US LLNL laboratory synchronization accuracy requirements of 10 ps. The time synchronization accuracy of the integrated unit is 10 ps. If the infrared stripe camera is used to assist the fine adjustment and control, the synchronization accuracy can be improved. In April 2000, the highest yield of neutron production was 3.9 × 109, which was the highest level of the same kind of equipment in the first round of the direct drive experiment. The time synchronization accuracy was 6 ps.

http://backtodisco.net/laserman123/blog/2033/the-technical-disadvantage-of-laser-weapons

https://organiqo.com/blog/64257/the-factors-influencing-laser-cutting-and-the-measurement-of-effect/

http://laserman123.blogmamy.pl/wpis,the-factors-influencing-laser-cutting-and-the-measurement-of-effect,3621.html