The technical significance of a 100mm focal length lies in its ability to maintain high beam collimation and energy density. By minimizing beam divergence, this optical setting ensures that laser energy remains focused over a specific working distance. This prevents energy from spreading out at the skin’s surface, allowing for the creation of precise, vertical micro-channels necessary for treating deep hypertrophic scar tissue.
A 100mm focal length acts as a stabilizer for laser energy, prioritizing depth and precision over surface interaction. It allows the beam to bypass superficial layers without causing excessive thermal damage, delivering energy directly to the deep fibrous bundles responsible for scar rigidity.
The Physics of Beam Control
Maintaining High Collimation
A 100mm focal length is engineered to keep the laser beam highly collimated. This means the light rays remain parallel for a longer distance rather than spreading out immediately after leaving the handpiece.
Preserving Energy Density
Because the beam does not spread significantly, the energy density remains concentrated. This allows the laser to exert consistent power on the target tissue without losing intensity as it penetrates deeper.
Preventing Beam Divergence
Shorter focal lengths often suffer from beam divergence, where the energy "cones" out. This divergence disperses energy across the skin surface, which can cause excessive surface thermal damage while failing to treat the deeper pathology. The 100mm setting mitigates this risk.
Clinical Impact on Scar Tissue
Creating Consistent Micro-Channels
The physical characteristics of this lens setting facilitate the formation of micro-channels with consistent depth and clear edges. In hypertrophic scars, irregular channels can lead to uneven healing; the 100mm lens ensures uniformity.
Addressing the Root Cause
Hypertrophic scars are characterized by abnormal fibrous bundles deep within the tissue. By enabling deep penetration, the laser can break down these collagen contractures. This directly addresses the root causes of physical deformity and limited mobility associated with thick scars.
Enhancing Drug Delivery
The vertical, defined nature of the channels created by this focal length is ideal for transdermal drug delivery. The clear edges and vertical depth ensure that therapeutic agents can penetrate effectively into the scar tissue rather than pooling on the surface.
Understanding the Operational Requirements
The Importance of Working Distance
While the 100mm focal length offers superior depth control, it relies on maintaining a specific working distance. The clinical benefits—such as the clear channel edges and energy density—are optimized only when the handpiece is held at the correct distance from the tissue.
Depth vs. Diameter
Deep penetration handpieces are designed to produce zones with smaller diameters at greater depths (often 120-220 micrometers or more). The trade-off is that the treatment is highly localized; it targets specific deep structures rather than ablating large surface areas.
Making the Right Choice for Your Goal
When selecting treatment parameters for scar therapy, the 100mm focal length serves specific pathological needs.
- If your primary focus is Safety: The 100mm setting minimizes the risk of surface burns by preventing beam divergence and excessive surface heat accumulation.
- If your primary focus is Efficacy: This focal length allows you to target and break down deep fibrous bundles that restrict movement, rather than just treating the skin's surface.
- If your primary focus is Combination Therapy: Use this setting to create precise, vertical channels that maximize the absorption and effectiveness of topically applied medications.
Ultimately, the 100mm focal length transforms the laser from a surface tool into a deep-tissue instrument, enabling structural remodeling where it is needed most.
Summary Table:
| Feature | Technical Benefit | Clinical Advantage |
|---|---|---|
| Beam Collimation | Maintains parallel light rays | Minimal energy loss during penetration |
| Energy Density | Concentrated power delivery | Effective breakdown of deep fibrous bundles |
| Beam Divergence | Prevents energy spreading | Reduced risk of superficial thermal damage |
| Micro-channel Shape | Precise, vertical channels | Enhanced transdermal drug delivery efficacy |
| Tissue Targeting | Focuses on deep pathology | Resolves root causes of scar rigidity |
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References
- Houhuang Qiu, Xiang Zhou. Manual Fractional Technology with CO2 Laser Combined with Transdermal Drug Delivery for Hypertrophic Scar: A Retrospective Study. DOI: 10.1007/s00266-025-04837-5
This article is also based on technical information from Belislaser Knowledge Base .
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