DIYode has model LG900 laser engraver. The laser is a 3 mirror flying optics setup with a 56mm final lens focal length.
The mirrors are 25mm in diameter and the lens is 20mm in diameter.
- Laser Cutter Usage Agreement
- Laser Cutter Training Curriculum
- Laser Cutter Certification
A very good place to start is KwartzLab's Wiki on their laser : Laser Cutter Care and Feeding :
- Cleaning optics
- Laser Cutter Maintenance?
- Make your own mirrors
- Laser Cutter Safety, Usage, Material Guidlelines
Please visit ANSI Z136 Safe Use of Lasers and Copy of ANSI Z136.1 for general laser safety information. Further Reading
Focus on the surface, under the surface, or on the bottom surface.