How To Construct And Use A Laser
How To Construct And Use A Laser
In 1957, Towns discussed some ideas about pumping light energy into atoms with graduate student Gordon Gould, and Gooden has been thinking similarly. Gould was worried that he would be dug out, so he wrote down his thoughts in case of emergency. He put forward more ideas on how to construct and use lasers, and in April 1959 applied for a patent to his employer, the high-tech research company TRG. Nine months ago, Schawlow and Townes applied for a patent on behalf of Bell Labs, which hired Schawlow as an employee and Townes as a consultant.
DVD players contain lasers, which are used not because it produces parallel beams, but because the light is emitted from a small point, so that it can be focused on different layers of the disc. Information (ones and zeros) is stored in multiple layers, and only one layer can be read at a time. Every time the disc rotates, every point on a specific layer is read. In order to make room for a large amount of information on each disc, the light beam must be focused on the smallest possible area. Except for lasers, no other light sources can do this.
When Bell’s patent was granted, Gould filed a lawsuit, claiming that he was the first person to conceive the device. In the next thirty years, the legal battle intensified. If Gould’s patents are valid, everyone who manufactures or uses lasers will owe him money-the longer the uncertainty of the patents, the more valuable they become as the laser industry develops. In 1987, Gould and his supporters began to win settlements. One of the biggest patent wars in history is over.Lasers are used in the medical field to improve the efficiency of precision work such as surgery. Brain surgery is an example of precision surgery, which requires the surgeon to reach the target area accurately. To ensure this, a laser is used to measure and point to the relevant area. The defocused laser can easily remove birthmarks, warts and skin discoloration from the skin. Surgery is fast, healing is fast, and most importantly, they are less painful than ordinary surgery performed with a scalpel.
The laser pointer is made of a cheap semiconductor laser, which together with the lens produces a parallel beam, which can be used to form a bright spot. Their range is very large. If someone points to a surface 200 meters (220 yards) away in the dark, then the person standing close to the pointed object will not see the flash point (of course, other people must hold the laser). On the other hand, the person holding the pointer will have difficulty seeing this point. The eternal issue of distance is more related to the behavior of the beam as it returns to the transmitter than to the length of the beam.
