The Physics of Laser Engraving: Why Continuous Wave (E80) and Pulsed Fiber (IR 3W) Both Vaporize Metal
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The Physics of Laser Engraving: Why Continuous Wave (E80) and Pulsed Fiber (IR 3W) Both Vaporize Metal
In the world of laser engraving, a common misconception is that only "pulsed lasers" can vaporize metal. Today, we are breaking that myth by explaining the physics behind our two flagship modules: the NEJE E80 (Continuous Wave) and the NEJE S1 IR 3W (Pulsed Fiber).
While both can achieve metal vaporization, they do so through fundamentally different physical mechanisms.
1. The NEJE E80: The Unstoppable Torrent
The NEJE E80 is a high-power Continuous Wave (CW) diode laser. Think of it as a high-pressure water gun spraying a continuous jet of photons.
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Linear PWM Response: The E80 features exceptional optical quality and responds linearly to PWM modulation at the nanosecond level. This means the power output is perfectly proportional to your software settings.
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High Average Power: With an average power density high enough to reach the vaporization threshold of metals like stainless steel and carbon steel, the E80 can perform deep engraving. Users have discovered that with proper settings, the E80 can directly vaporize the surface of metal, creating durable marks. It relies on thermal accumulation—delivering a constant stream of energy until the material melts and boils away.
2. The NEJE S1 IR 3W: The High-Energy Projectile
The NEJE S1 IR 3W is a Pulsed Fiber Laser. If the E80 is a water gun, the IR 3W is a semi-automatic pistol firing high-speed bullets.
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Peak Power vs. Average Power: Although its average power is low (3W), it emits light in extremely short pulses (nanoseconds). During each pulse, the instantaneous Peak Power is thousands of times higher than its average rating.
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Impact Vaporization: Each pulse acts like a tiny bullet hitting the metal surface. The energy density is so concentrated that it instantly vaporizes the material without spreading heat to the surrounding area (Cold Marking). This is why it excels at marking metals (including gold, silver, and copper) and plastics with extreme precision and contrast.
Comparison Table
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Feature
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NEJE E80 (CW Diode)
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NEJE S1 IR 3W (Pulsed Fiber)
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|---|---|---|
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Physical Analogy
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Continuous Water Gun
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Rapid-Fire Pistol
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Power Type
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High Average Power
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High Peak Power
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Interaction
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Thermal Accumulation (Melting/Boiling)
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Impact Vaporization (Cold Marking)
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Metal Effect
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Deep engraving, annealing
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Surface marking, etching
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Heat Affected Zone
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Larger (due to heat transfer)
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Minimal (No residual heat)
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Best For
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Cutting wood/acrylic, deep metal engraving
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Jewelry marking, plastic texturing
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Conclusion
Both modules are capable of vaporizing metal, but they utilize different physical properties to get there. The E80 uses brute-force thermal energy to boil the metal away, while the IR 3W uses concentrated shockwaves of energy to blast it away. Understanding this distinction will help you choose the right tool for your next masterpiece.