• #16-1. Yellow Laser



    ▶ Previous Artlcle : #15-9. Long-pulsed Alexandrite Laser



    In this issue, we will look at the Yellow Laser.


    Yellow Laser is a short-pulsed laser with 24ns pulse duration.


    It is a short-pulsed laser with a very high pulse repetition rate of 12,000hz, but it is recognized as if the laser beam goes out without interruption, and is described as a quasi-continuous laser.


    So it is not a true long pulse, but it produces a tissue response similar to that of a long-pulsed laser.



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    Yellow Laser Generation Process and Medium


    Yellow Laser is called by that name due to the color because the irradiated light has a strong yellow color like a flash, and the medium is copper (Cu) and bromide (Br).


    Two wavelengths are produced as two solid media are used.


    Green light with a wavelength of 511nm is emitted by bromide, and yellow light with a wavelength of 578nm is emitted by copper.


    Yellow Laser uses a solid medium, but at the moment of making a laser beam, it uses a gaseous medium.


    Looking at the process of creating a Yellow Laser, first, when heated with 420℃ of heat, copper vapor starts to be formed in solid copper, and a green laser with a wavelength of 511nm is generated by bromide.


    Further heating to 480℃ generates a Yellow Laser with a wavelength of 578nm by completely vaporized copper.


    At this time, the important thing is that as the solid state copper changes its vaporization point by bromide, it creates the optimal yellow wavelength (578nm) laser output value and the green wavelength (511nm) laser output value, which are used after mixing with a handpiece filter.




    Figure 1. Absorption coefficients and chromophore (melanin, hemoglobin) of Yellow Laser.




    -To be continued

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