What is a "picosecond"?

2022-01-12 09:45:19

Lasers should be known to be photons released when atoms absorb energy and jump to a high energy level and then fall back to a low energy level. It is one of the greatest inventions of the 20th century. Soon after the invention of the laser, it was found that high-power ultra-short (picosecond) light pulses could be obtained from some lasers, and with this pulse, it was possible to conduct direct transient studies of extremely fast phenomena, but it was necessary to develop ultrafast optics and electronic devices that were fully matched.

Picosecond laser is a kind of laser technology.

The picosecond is a unit of time for photons, and it is a unit of time for the perverse velocity, which can be seen in the conversion relationship to other times:

1 second = 1000 milliseconds

1 second = 1000,000 microseconds

1 second = 1000,000,000 nanoseconds

1 second = 1000,000,000,000 picoseconds

Often mentioned nanosecond, millisecond, picosecond laser, these time units in the laser refers to the pulse width of the laser, pulse width is a common term for laser, also known as pulse duration, generally expressed in milliseconds or nanoseconds. The picosecond laser is a milestone new technology in the field of laser beauty in recent years, and the pulse width can reach the level of picoseconds.

A picosecond is only one trillionth of a second.

Picosecond pulses have two most important properties, namely: ultra-short durations, and very high power when needed. That is to say, the ultra-short pulse width of the picosecond and the ultra-high power can reduce the burn caused by the traditional laser heat effect on the skin, and at the same time, it can reach the target site and crush the target.

Of course, almost all the traditional advantages of laser sources are also available in the field of picoseconds:

The divergence angle of the beam is small;

The light source is easy to control;

And the laser beam has excellent monochromaticity.

Such a powerful function, creating the current picosecond laser in the medical beauty industry of the top name, according to the business claim, as long as the picoseconds, melasma, tattoos, scars, freckles, elderly spots are all traceless removal, including wrinkle removal, pore shrinkage, skin rejuvenation and other common skin problems are also solved in seconds. The role of picoseconds is to make your skin white and smooth in all directions, and rejuvenate. Regardless of whether the business's publicity is exaggerated or not, since picosecond has such a powerful function, it must have a certain theoretical support, so what is the theoretical basis for the picosecond laser?

2. The mechanism of action of picoseconds

Picosecond laser is only one hundredth of the pulse width of the traditional Q switch nanosecond, so short pulse width, light energy is too late to convert into thermal energy, directly do not have to worry about the photothermal effect, so the damage caused by traditional laser freckles to the skin, in the picosecond laser here, there is no need to worry.

The picosecond laser can make the pigment particles actively expand rapidly, produce photomechanical effects, be blasted and torn into pieces, and eliminate the color spots.