Maximizing Output Power in DIY CNC Laser Cutters

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SUMMARY

The discussion focuses on optimizing output power in DIY CNC laser cutters by considering the use of stationary mirrors and the impact of additional travel for the laser. Joe highlights the significant loss of power (approximately 4%) at each air/glass interface when using uncoated plane glass, which is why high-power lasers prefer mirrors. Tom emphasizes the advantages of anti-reflective coatings and front-surface mirrors, while also noting the necessity to adjust the focal point of the beam when modifying optics.

PREREQUISITES
  • Understanding of CNC laser cutter mechanics
  • Knowledge of optics and light behavior
  • Familiarity with anti-reflective coatings
  • Experience with beam focal adjustments
NEXT STEPS
  • Research the benefits of anti-reflective coatings for specific laser wavelengths
  • Explore the use of front-surface mirrors in high-power laser applications
  • Learn about beam focal point adjustments in CNC laser systems
  • Investigate the impact of air/glass interfaces on laser performance
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DIY CNC laser cutter enthusiasts, optical engineers, and anyone looking to enhance the performance and efficiency of laser cutting systems.

theycallmevirgo
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TL;DR
How many additional mirrors and/or additional distance can I have in a laser assembly before I start seeing power losses?
I was thinking of an improvement to the "traditional" diy cnc laser cutter that might entail some extra travel for the laser and/or additional (stationary) mirrors. Is there some way to calculate how this will affect output power?

Many thanks in advance

Joe
 
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Rule-of Thumb:
Using plane glass (uncoated), you lose about 4% at each air/glass interface.

That's why high power Lasers us mirrors instead of lenses, that 4% cracks the lenses.

You can do much better if using an Anti-Reflective coating for the specific light wavelength. Front-surface mirrors are a good option, but those can be pricey and difficut to clean without damage.

Beam distance thru air shouldn't be a major problem in itself, but you may have to adjust the focal point of the beam by modifying the optics.

Have Fun!
Tom
 

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