Small guide on how a laser works


Nowadays people are often hearing that lasers are used in medicine, industry, skin care and many other domains, but most of them do not know how a laser works. A laser is a device that produces billions of atoms that pump out trillions of photons in the same time and in this way, it produces a concentrated light beam. A laser is made from a flash tube, which contains a long crystal made of ruby. A high-voltage electric supply makes the tube flash to pump energy into the ruby crystal. This technology makes the laser very versatile, and it can be used for multiple purposes, like cutting tools, scientific research or skin care. Many skin care clinics like use lasers to provide health services for their clients.

What people should know about lasers?

The ancestors of lasers were called masers, which produced radio waves not visible light as lasers do. Arthur Schawlow and Charles Townes invented masers, in 1950. Their idea was developed by Gordon Gould who decided to see how masers will work if they had to produce visible light. Gordon Gould had not built a real laser, but the person who realised a working one was Theodore Maiman. A laser is a source of high intensity light that has multiple properties. It is collimated because its light beams travel in parallel. It is monochromatic because it produces a single wavelength light, and it is coherent because its light beam waves are in phase. Its light can be focused into small spots. The laser light can be produced within an optical cavity that contains one of the following mediums: liquid, gas, or solid. Every medium produces a specific wavelength of light. This specific light can be visible in either the infrared spectrum or the visible spectrum.

How laser can be used in skin care

Different skin lesions can be treated with different type of laser light. For example, the visible light is used to treat the vascular skin lesions, because they absorb it at 418, 542 or 577 nm. Both infrared and visible light can be used to treat the pigmented skin lesions because they contain melanin, which absorbs them. Laser light destroys only the targeted cells and do not harm the surrounding ones. Some specific lasers can be used in skin laser surgery, such as: CW, Quasi-CW and pulsed. Laser is a technology that improves people’s lives.