The 300 µsec micro-pulse mode acts as the primary thermal catalyst in combined pore-reduction protocols. It functions by delivering a controlled "quasi-long" pulse that generates a photothermal effect, penetrating deep into the dermal layer to initiate collagen remodeling. Crucially, when used with carbon lotions, this mode pre-conditions the target area by warming carbon particles to facilitate better heat transfer within the pores.
The 300 µsec mode shifts the laser-tissue interaction from mechanical shock to controlled heating. Its main purpose is to gently denature existing collagen and pre-warm the treatment site, setting the stage for more aggressive rapid-pulse steps that follow.
The Mechanism of Deep Dermal Heating
Generating a Photothermal Effect
Unlike rapid pulses that create photoacoustic (mechanical) shockwaves, the 300 µsec pulse width is sufficiently long to generate pure heat. This is known as a photothermal effect.
Stimulating Collagen Regeneration
The heat generated by this mode targets the deeper dermal layers. This thermal energy causes the initial denaturation of collagen fibers, which triggers the body's natural healing response and promotes the regeneration of new, tighter collagen.
Enhancing Carbon-Assisted Protocols
Pre-Warming Carbon Particles
In protocols utilizing carbon powder, the 300 µsec mode plays a vital preparatory role. It gently heats the carbon particles settled within the pores before they are destroyed by subsequent steps.
Improving Heat Transfer
By pre-warming the carbon, the laser ensures that thermal energy is effectively transferred to the pore walls. This prepares the tissue for the subsequent "rapid pulse" stimulation, maximizing the overall efficacy of the pore reduction treatment.
Operational Considerations and Trade-offs
Thermal Accumulation
Because this mode relies on a longer pulse width to generate heat, the tissue retains thermal energy longer than with nanosecond pulses. While this is beneficial for collagen stimulation, it requires careful monitoring to ensure the "gentle" heating does not become excessive.
Distinct from Pigment Destruction
It is important to recognize that the 300 µsec mode is not designed for the immediate shattering of pigment or carbon. Its role is strictly thermal preparation and stimulation, not mechanical destruction.
Making the Right Choice for Your Goal
To utilize the 300 µsec micro-pulse effectively, align its function with your specific clinical objective:
- If your primary focus is Skin Tightening: Rely on this mode to deliver the deep dermal heating necessary to stimulate collagen denaturation and long-term regeneration.
- If your primary focus is Pore Cleansing (with Carbon): Use this mode as a mandatory "pre-treatment" step to warm the carbon and pore walls, ensuring the subsequent rapid pulses are more effective.
The 300 µsec mode is the bridge between superficial cleansing and deep structural remodeling.
Summary Table:
| Feature | 300 µsec Micro-Pulse Mode | Rapid-Pulse Mode |
|---|---|---|
| Primary Effect | Photothermal (Heat Generation) | Photoacoustic (Mechanical Shock) |
| Target Depth | Deep Dermis (Collagen Layers) | Superficial / Pigment / Carbon |
| Mechanism | Gentle heating and pre-warming | Immediate shattering of particles |
| Core Goal | Skin tightening & pore preparation | Cleansing & pigment destruction |
| Benefit | Long-term structural remodeling | Immediate surface clarification |
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References
- Hye Jin Chung, Kee Yang Chung. ENLARGED PORES TREATED WITH A COMBINATION OF Q-SWITCHED AND MICROPULSED 1064nm Nd:YAG LASER WITH AND WITHOUT TOPICAL CARBON SUSPENSION: A SIMULTANEOUS SPLIT-FACE TRIAL. DOI: 10.5978/islsm.20.181
This article is also based on technical information from Belislaser Knowledge Base .
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