Laser machine for hollywood peeling

1.What are the contraindications to picosecond lasers?
As with other laser devices, picosecond lasers are relatively contraindicated in patients with darker skin tones (ie, Fitzpatrick skin types 4–6), who are more susceptible to side effects from laser treatment.
Picosecond lasers use pulse durations of less than 1 nanosecond, which causes predominantly photoacoustic damage (pulses of light that can be measured by changes in pressure ie, sound waves) rather than photothermal destruction of pigment or ink particles (measured by production of heat). This results in effective clearance of abnormal pigment, while minimising photothermal damage to the surrounding tissue.

2.Why choose a picosecond laser?
A picosecond laser selectively destroys the target pigment without damaging healthy, normal tissue. This allows rapid clearing of the abnormal pigmentation with minimal collateral damage to surrounding tissue.
Picosecond lasers used for tattoo removal require fewer treatments, cause fewer side effects, and result in reduced post-procedural downtime compared to nanosecond Q-switched lasers. They can clear some tattoos that are refractory to other forms of laser therapy, and there is a reduced risk of causing scarring and hypopigmentation.
The additional cost and reduced availability of picosecond lasers compared to Q-switched lasers currently restricts their widespread use.