Liquid lasers appeared around the 60s of the 20th century; in the 80s of the 20th century, they were one of the most promising lasers in the world, because Various solutions were used as the active element, and a combination of these solutions made it possible to obtain lasers with different wavelengths, as well as to widely vary their characteristics. Their cheapness and ease of manufacture, as well as the qualitative characteristics of laser radiation, have the same properties as solid-state lasers and are an order of magnitude better than diode lasers, due to their widespread use in the late 80s and early 90s 20- century.
However, at the beginning of the 21st century, interest in them decreased significantly, this is primarily due to the following reasons:
The liquid compositions that are used in lasers, especially in blood vessel removal lasers, turn out to be unstable compared to solid-state laser rods or diode arrays and during operation it is necessary to change the entire laser active medium, which leads to frequent expensive maintenance.
Most liquid solutions used to generate laser radiation are toxic and do not meet CE and FDA safety requirements.
Liquid laser media conduct heat much worse than solid-state laser elements; therefore, liquid lasers cannot operate simultaneously with high energy and frequency due to the high risk of overheating and failure.
Despite these shortcomings, liquid lasers are still used in cosmetology. The main area of their application is the removal of unwanted vascular formations. Currently, you can buy Vbeam Candela or VASQ Deka lasers with high enough characteristics to remove blood vessels. Basically, it is precisely these two models that are presented among liquid lasers for removing blood vessels. What are the main advantages of Vbeam Candela and VASQ Deka liquid lasers?
Of course, the main advantage of these models is the wavelength of 595 nm, which is fairly well absorbed by hemoglobin molecules, so even a small amount of laser radiation is enough to coagulate the vessels. To create a coagulation effect, the duration of the laser pulse should be less than the period of thermal relaxation of the vessel absorbing the laser radiation. In particular, in the Vbeam and VASQ models, the pulse duration varies from 0.5 to 40 ms, which allows you to process a very wide range of vessels – from capillaries to large vessels.
The main laser devices for removing blood vessels are currently KTP medical lasers. Unlike liquid lasers, laser radiation in these systems occurs when 1064 nm laser radiation (Nd: YAG laser radiation) is transmitted through a special nonlinear KTP crystal (potassium titanyl phosphate (KTiOPO4)), as a result of which a laser beam is formed at the system output with a wavelength of 532nm. This process is called doubling the frequency of the laser beam (the frequency for laser radiation is inversely proportional to the wavelength).
The wavelength of 532 nm, as can be seen from the absorption spectrum, is even better absorbed by hemoglobin; therefore, for shallow vessels, KTP lasers are more preferable than liquid lasers. On the other hand, for deep-lying vessels, it is preferable to use “pure” radiation from neodymium lasers with a wavelength of 1064 nm, because it is able to penetrate deeply into the skin. In addition to stronger hemoglobin absorption, KTP lasers are capable of operating at higher frequencies and are easier to service. Despite this, the use of Vbeam Candela and VASQ Deka liquid lasers is also justified, as a wavelength of 595 nm lies between 532 and 1064 nm, and due to the narrowness of the spectral line and the high monochromaticity of laser radiation (not inferior to solid-state lasers), it is capable of coagulating well-buried vessels.
In order to make the right choice and buy a laser for removing blood vessels, which is preferable for your medical center, we strongly recommend testing medical laser device with the help of your medical specialists so that they can appreciate the effectiveness, convenience and characteristics of the laser device.