The intended purpose of sequentially firing different laser wavelengths is to exploit the specific penetration depths of each wavelength to target tissue structures—such as hair follicles—that reside at varying levels within the skin. By firing a shorter wavelength (like 755nm) followed immediately by a longer wavelength (like 1064nm), the treatment creates a "multi-dimensional" effect that addresses both superficial and deep targets in a single pass.
Core Takeaway Sequential firing utilizes multi-dimensional energy superposition to increase the destructive force applied to stubborn targets. Rather than relying on a single depth of penetration, this strategy layers energy to ensure comprehensive coverage across the complex, uneven distribution of biological structures.
The Mechanics of Sequential Firing
Combining Complementary Depth Advantages
Every laser wavelength penetrates tissue to a specific depth based on the principle of stimulated radiation and absorption. Generally, longer wavelengths penetrate deeper into human tissue, while shorter wavelengths are absorbed more superficially. Sequential firing combines these distinct profiles—such as the moderate depth of 755nm and the deep penetration of 1064nm—within the same treatment area.
Multi-Dimensional Energy Superposition
The primary goal of this technique is energy superposition. By stacking pulses of different wavelengths, the system delivers a compounded thermal effect. This increases the destructive force against resistant targets, such as stubborn hair follicles, without requiring excessive energy levels from a single wavelength.
Addressing Complex Distributions
Biological structures, particularly hair follicles, are not located at a uniform depth in the dermis. A single wavelength might miss follicles that are too deep or too shallow for its specific profile. Sequential firing ensures comprehensive coverage by managing various follicle characteristics and depths within a single protocol.
Beyond Hair Removal: Layered Strategies
Treating Texture and Structure
While the primary application often involves hair removal, the logic of sequential or layered treatment applies to aesthetic resurfacing as well. A deep structural treatment can be followed by a superficial fractional laser to target the skin surface. This addresses issues like scarring from the bottom up, improving deep structural components and surface pigmentation simultaneously.
Customization for Body Contouring
Similar principles apply in laser lipolysis, where wavelength selection dictates the biological outcome. A 1064nm wavelength may be selected for deep tissue penetration and skin tightening, while a 1320nm wavelength is chosen to target fat specifically. The availability of multiple wavelengths allows practitioners to customize the protocol based on the specific body area and patient needs.
Understanding the Trade-offs
Increased Thermal Load
While "energy superposition" increases efficacy, it also increases the total amount of heat (thermal load) delivered to the tissue. This requires precise cooling mechanisms to prevent damage to the surrounding skin, particularly the epidermis.
Complexity in Parameter Selection
Using multiple wavelengths introduces more variables into the treatment protocol. The practitioner must account for the patient's skin phototype and the specific characteristics of the lesion or hair. Incorrectly balancing the two wavelengths can lead to adverse effects, such as burns or hyperpigmentation, especially in darker skin tones.
Making the Right Choice for Your Goal
Sequential firing is a powerful tool, but its application depends entirely on the clinical objective.
- If your primary focus is stubborn or deep hair removal: Look for a protocol using sequential 755nm and 1064nm wavelengths to utilize multi-dimensional energy superposition for maximum destructive force.
- If your primary focus is scar revision or skin texture: A layered approach is best, utilizing deep treatment for structure followed by superficial fractional lasering for surface appearance.
- If your primary focus is body contouring: Prioritize devices that offer wavelength customization (such as 1064nm vs. 1320nm) to balance fat reduction with skin tightening.
The most effective laser strategy always aligns the wavelength's depth of penetration with the specific anatomical depth of the target tissue.
Summary Table:
| Feature | Sequential Wavelength Strategy | Traditional Single Wavelength |
|---|---|---|
| Energy Delivery | Multi-dimensional energy superposition | Single-depth energy delivery |
| Target Depth | Multiple layers (Superficial to Deep) | Fixed specific depth |
| Clinical Efficacy | Higher; effective on stubborn targets | Standard; limited by wavelength depth |
| Customization | High; adjustable for complex structures | Low; restricted to specific skin types |
| Applications | Hair removal, scar revision, contouring | Specific single-indication treatments |
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References
- JANE G. KHOURY, Mitchel P. Goldman. Comparative Evaluation of Long-Pulse Alexandrite and Long-Pulse Nd:YAG Laser Systems Used Individually and in Combination for Axillary Hair Removal. DOI: 10.1111/j.1524-4725.2007.34125.x
This article is also based on technical information from Belislaser Knowledge Base .
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