| Properties |
Argon Laser |
Ruby Laser |
Helium Laser |
Neo-Dymium Yag Laser |
Tunable-Dye Laser |
| Color of light |
Visible blue green |
Visible red |
Visible red |
Invisible Near infrared |
Fluorescent dyes, (varying composition & colors) |
| Penetration (co-efficient of extinction) |
1-2 mm |
1-2 mm |
Little energy & Penetration |
More than 3 mm |
1-3 mm |
| Tissue scatter |
Moderate |
Moderate |
- |
High |
Variable |
| Wave length Format continous pulsatory |
488-514nm Continuous |
695 nm Pulsed high energy |
Continuous |
1060 nm Continuous |
400-1000 nm Pulsed |
| Absorption |
Non-selective. Selective action, controversial haemoglobin & melanin |
Selective. Blue or black pigment |
Non-Selective |
High energy. No color specificity |
Selective dye rhodamine 6G-577 nm specific for haemoglobin |
| Indications |
1. Vascular lesion
- Portwine stain
- Angioma
- Lymphangioma
- Kaposi's sarcoma
2. Pigmentary
- Lentigenes
Naevus of Ota
- Chloasma
3. Tattoos
4. Granuloma faciale
- Lymphocytoma cutis |
1. Tattoos
2. Naevi
Pigment is exposed by tissue steam and then phagocytosed face lifts |
1. Mainly as laser
2. Biosumulation
Acceleration of wound healing
3. Non surgical cavernous
4. Controversial usefulness |
1. Endoscopic coagulation of haemorr
2. Malignant tumor of GIT, bladder, bronchi
3. Bulky and basal cell haemongiomas
4. keloid
5. haemongioma after putting special crystals in the beam |
1. Vascular lesion
2. Photo dynamic therapy with HDP (Haema to Porphyrin derivative)
3. Useful in cavity tumor, malignant melonomas epithelioma |
| Disadvantages |
Scarring. Non selective action. hence in disfavor. |
Scarring and danger of dissemination of malignant cells by shock waves. |
Low energy; little use in practice. |
Useful tool in surgical practice. |
Unpredictable tissue reaction levels. Undesirable phot-sensitivity reactions. |
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