Many Jimei people, like me, have always been confused about the difference between photorejuvenation and laser, and what is the difference in the principle of action. HRMRA learned the secrets by reading through the materials and systematically learning. It is destined to have another series for Jimei people to digest slowly. This article will first learn about the laser.
1.What is a laser?
Simply put, laser is light that is stimulated and released and amplified. The English laser of laser expresses this meaning. It is actually an abbreviation of light amplification by stimulated emission of radiation.
Substances (atoms, molecules, ions, compounds, etc.) that can generate lasers undergo ion number inversion under special conditions (electrical and optical excitation), and the light reflected by the resonator is laser light.
Lasers can have different names depending on the medium generated by the laser (the medium filled in the laser cavity):
If the medium is cut CO2, a 10600nm laser will be generated, so it is called CO2 laser;
If the filled medium is ruby, the generated laser wavelength is 694nm, so it is also called ruby laser.
In addition to these two kinds of media, there are many other media, and different media excite different lasers, which are not listed for the time being.
Lasers can be divided into:
Continuous, semi-continuous or quasi-continuous lasers and pulsed lasers.
Continuous lasers release their laser energy in a stable continuous beam, such as CO2 lasers, argon ion lasers, krypton ion lasers, krypton ion dye lasers, etc.
The energy of the pulsed laser is released in the form of pulses, that is, the therapeutic dose of laser energy can be released in a fixed (and sometimes adjustable) time (pulse width) (called a pulse), and between each pulse. time is controllable. According to the pulse width, such lasers can be divided into long-pulse lasers (with a pulse width of milliseconds) and short-pulse lasers (with a pulse width of nanoseconds).
Such lasers include: Q-switched laser (Q-switched ruby laser, Q-switched alexandrite laser, Q-switched Nd:YAG laser), long-wavelength frequency-doubling Nd:YAG laser, pulsed CO2, etc.
Lasers have unique physical properties, the most important of which needs to be remembered is that
Monochromaticity-Laser is different from different light and sunlight, its wavelength is single, or the wavelength range is very narrow, showing a single color. The wavelength of the laser is determined by the laser medium filled in the laser cavity. This enables selective photothermal action, as the laser light must be absorbed by a specific target, such as melanin or hemoglobin, to be therapeutically effective.
High energy and easy focusing – Since the laser wavelength is relatively single and coherence is good, the laser energy is almost focused to a point and has very high energy.
The principle of laser freckle removal takes advantage of the above two characteristics:
The laser can selectively act on different skin tissues. As long as a specific light source is used, it can ensure that only the pigmentation spots are affected, and the normal skin tissues will not be affected. The laser energy can be absorbed by the pigment particles in the lesion in a very short period of time, resulting in extremely high temperature, causing it to rapidly expand, forming a micro-blast, which is vaporized and crushed into very small particles, which are then absorbed by macrophages in the tissue. swallow, clear.
Laser freckle removal
Refers to the destruction of pigment and/or pigment cells to lighten and remove pigmentation. The specific treatment is more complicated, and the doctor needs to select the appropriate instruments and parameters according to the type of plaque. Effectively destroys pigment and/or pigment cells. It mainly treats chloasma, age spots, nevus of Ota, café-au-lait spots, etc.
Laser hair removal
Using the gold standard wavelength semiconductor laser for hair removal, it can fully act on the melanin in the hair follicle and effectively remove hair of various skin colors and any part.
Like a laser
There are two types of exfoliation (that is, gasification) and non-ablative types, which play a therapeutic role through the focal photothermal effect of the laser, and mainly treat various superficial hyperplasia and atrophic scars, such as superficial acne scars and trauma scars.