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Q-Switched ND:Yag Laser

Nd:Yag meaning NeoDymium: Yttrium Aluminium Garnet crystals.

It uses a solid lasing medium & delivers short high energy pulses.


Spot size : 6mm.


Green colour does not respond to Nd:Yag lasers.

It has longer wavelengths & hence deeper penetration, hence less melanin absorption.


Clinical Indications of a Q-Switched Nd YAG Laser:

Pigmented lesions:


For Epidermal lesions-532 nm


For Dermal lesions-1064nm

  1. Lentigens: 1-2 sessions required with a frequency at 532nm
  2. Café-au-lait macules
  3. Freckles
  4. Mangolian spots

Division of pigmented lesions-

    1. Drug induced
    2. Post inflammatory
    3. Hormonal 
  2. According to Location Of Pigment
    1. Epidermal
    2. Dermal
  3. Causation of Pigmentation
    1. Nevoid
    2. Hereditary
    3. Acquired

Treatments used:

  • Topical application
  • Chemicals peel
  • Microdermabrasion

But lesions like nevus, tattoos freckles etc can’t be removed by these.

Hence this resulted in devising an ideal laser / light system which effectively targets skin melanin with variable spot sizes, different wavelengths & variety of effective cooling devices without damaging surrounding skin .

  • Three wavelength bands are most useful for treating pigmented lesions : green, red and infrared.
  • Dark colours like black, blue and green with 1064-nm wavelength
  • Brighter colours like red, orange and yellow with 532-nm wavelength

Hence in brief we say for the lasers to have effect sufficient wavelength, right pulse duration and sufficient fluence is required.


Other indications include:

  1. Photoageing
  2. Melasma
  3. Tattoo: 
    1. Professional tattoos
    2. Amateur tattoos
    3. Cosmetic tattoos
  4. Non Ablative skin resurfacing for wrinkles & acne scars.
  5. Laser assisted Hair reduction.
  6. Vascular lesions

Post laser signs

There is immediate -
1. Redness

2. Inflammation.

3. Frosting& later Scab formation.


If the penetration is deeper & long time exposure leads to bleeding, which slows the healing leading to scarring either (hypopigmentation or hyperpigmentation).



  • Physical urticaria
  • Minute petechiae
  • Rebound hyperpigmentation
  • Acniform eruption
  • Whitening of fine hair

Management of complications:

Hypopigmentation: Fluence should be reduced; treatment interval doubled

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