Laser Science (Parameters)

Treatment parameters for hair removal using long pulsed Nd YAG Laser

Colour of Skin Fluence Pulse width Spot
 Fine Hair
Fair 30-40 10-20 6
Wheatish 25-35 10-20 6
Dark 20-30 10-20 6
 Coarse Hair
Fair 30-35 30-40 07-08
Wheatish 25-30 30-40 07-08
Dark 20-25 30-40 07-08

Treatment parameters for Vascular lesions using long pulsed Nd YAG Laser

Vessel size Fluence Pulse width Spot
Large reticular veins (2-4mm) 130 -160 30-50 05-07
Small reticular veins (1-2 mm) 130 – 170 20-40 03-05
Telangiectasia  – Spider vein  (≤ 1 mm) 160 – 180 10-15 02-03

Treatment parameters for Wart using long pulse Nd YAG laser

Administer a single laser shot in the center of the wart followed by laser shots around the circumference, ending with an additional single shot in the center of the wart. The patient should be followed up in 2-4 weeks as needed.

Fluence (j/cm2) Pulse width (ms) Spot size (mm)
120 15 4

Treatment parameters for different lesions using Erbium YAG Laser

Lesions Energy Pulse Width Spot size Pass/Session
S Keratosis 300-500 SP 02-03 03-10
Naevi 300-500 SP 02-03 03-05
Xanthelasma 500 SP 02-03 05-15
DPN 200-300 SP 2 02-03

Treatment parameters for different lesions using Co2 Laser

Lesions Watt Exposure Time Super Pulse Repeat Pulse Off-Time
Verrucae 03-07 0.1 / con on on 0.1-1
Keratosis 03-05 0.01 on on 0.1-0.5
Corn 03-05 0.05 x on 0.02-0.03
Skin Tags 07-12 x x x x
Naevi 03-05 0.01 on on 0.02
Syringoma 05-07 0.01 on on 0.02

Acne Scar reduction

Acne scar reduction can be obtained using Erbium YAG laser. The results can be better if we do subcission of bigger scars and do chemical peeling 3 or 4 times before the laser treatment. The procedure is done under local anaesthesia. First the shoulder of each scar is cut and then the whole area is treated. Finally feathering of the treated area is done. The procedure may be repeated after 6 months.
Oral isotretinoin is absolute contraindication for laser skin resurfacing. It damages the function of skin appendages – impair skin ability to reepithelisation

Treatment parameters for Acne scar reduction using Erbium YAG laser

Area Energy Pulse Spot Freqency Pass Session
Shoulder 500 SP 2 2 02-03 1
Whole 500 SP 3 3 2 2
Whole 500 SP 4 3 2 1
Feathering 300 SP 5 2 2 1