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Wavelength Science

Laser Penetration Depth Chart

Laser penetration depth into human skin tissue ranges from 0.03mm (Er:YAG, 2940nm) to 4.0mm (Nd:YAG, 1064nm), determined by wavelength and the primary tissue chromophore targeted. Shorter wavelengths (<800nm) are preferentially absorbed by melanin in the epidermis and upper dermis. Longer wavelengths (800-1064nm) bypass melanin to reach deep dermal structures. Water-absorbing wavelengths (2940nm, 10600nm) cause surface ablation with minimal deep penetration.

Updated April 2026 · Source: Aesthetic.Energy wavelength reference

Laser Wavelength Penetration Depth Chart — Aesthetic EnergyNd:YAG laser (1064nm): penetration depth 4mm into Deep Dermis. Primary chromophore: Melanin + Hb. Applications: Hair removal (all skin types), vascular lesions, tattoo removal, skin tightening. Diode laser (810nm): penetration depth 2.5mm into Mid-Dermis. Primary chromophore: Melanin. Applications: Hair removal (Fitzpatrick I-IV), vascular lesions. Alexandrite laser (755nm): penetration depth 1.5mm into Upper Dermis. Primary chromophore: Melanin. Applications: Hair removal (Fitzpatrick I-III), tattoo removal, pigmented lesions. Ruby laser (694nm): penetration depth 1mm into Epidermis–Dermis junction. Primary chromophore: Melanin. Applications: Tattoo removal (black/blue ink), pigmented lesions, hair removal (light skin). KTP laser (532nm): penetration depth 0.5mm into Epidermis. Primary chromophore: Hemoglobin (Hb). Applications: Vascular lesions, pigmented lesions, tattoo removal (green/blue ink). CO₂ laser (10600nm): penetration depth 0.1mm into Epidermis (ablative). Primary chromophore: Water (H₂O). Applications: Deep resurfacing, scar revision, wart/lesion removal, skin tightening. Er:YAG laser (2940nm): penetration depth 0.03mm into Superficial Epidermis. Primary chromophore: Water (H₂O). Applications: Skin resurfacing, acne scars, fine lines, micro-ablation. Source: Aesthetic.Energy wavelength reference database. Shorter wavelengths (532nm KTP) are absorbed in the epidermis at 0.5mm. Longer wavelengths (1064nm Nd:YAG) penetrate to 4.0mm in the deep dermis. CO₂ (10600nm) and Er:YAG (2940nm) are water-absorbing ablative wavelengths with shallow penetration (0.03-0.1mm) used for skin resurfacing.EpidermisPapillary DermisReticular DermisHypodermis0mm0.5mm1mm1.5mm2mm2.5mm3mm3.5mm4mm4.5mm5mmDepth (mm)4mm1064nmNd:YAG2.5mm810nmDiode1.5mm755nmAlexandrite1mm694nmRuby0.5mm532nmKTP0.1mm10600nmCO₂0.03mm2940nmEr:YAGLaser Wavelength vs. Tissue Penetration DepthSource: aesthetic.energy · Updated April 2026
WavelengthLaserDepthChromophore
532nmKTP0.5mmHemoglobin (Hb)
694nmRuby1mmMelanin
755nmAlexandrite1.5mmMelanin
810nmDiode2.5mmMelanin
1064nmNd:YAG4mmMelanin + Hb
2940nmEr:YAG0.03mmWater (H₂O)
10600nmCO₂0.1mmWater (H₂O)

Penetration depth values represent typical clinical ranges and vary with fluence, pulse duration, and tissue hydration. For comprehensive wavelength data, visit aesthetic.energy/laser-technology.

Frequently Asked Questions

How deep does an Nd:YAG laser penetrate skin?

The Nd:YAG laser at 1064nm penetrates approximately 4.0mm into the deep dermis. This deep penetration makes it safe for all Fitzpatrick skin types (I-VI) and effective for deep vascular lesions, hair removal in darker skin, and tattoo removal. The 1064nm wavelength is absorbed by melanin, oxyhemoglobin, and water.

What is the difference between Alexandrite and Diode laser penetration?

Alexandrite (755nm) penetrates approximately 1.5mm into the upper dermis, while Diode (810nm) penetrates approximately 2.5mm into the mid-dermis. The deeper penetration of the Diode laser makes it suitable for Fitzpatrick skin types I-IV, while Alexandrite is generally limited to types I-III due to higher melanin absorption at shorter wavelengths.

Why do CO₂ lasers have shallow penetration despite being high-powered?

CO₂ lasers at 10600nm have very shallow penetration (0.1mm) because their primary chromophore is water. Since skin tissue is approximately 70% water, the 10600nm wavelength is almost completely absorbed at the surface, causing ablation (vaporization) of tissue. This makes CO₂ lasers ideal for resurfacing rather than deep tissue treatment.

Equipment Using These Wavelengths

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Aesthetic Exchange

Browse pre-owned Alexandrite, Diode, and Nd:YAG devices.

AestheticTrack

Track shot counts and calibration for each wavelength handpiece.

About This Article

Expert Reviewed

This comprehensive guide was created by the Aesthetic.Energy editorial team in collaboration with AI-powered research and writing systems. Our content combines:

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Medical professionals, aesthetic technology specialists, and industry experts review and validate all content for accuracy and clinical relevance.

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Last updated: April 2026

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