Description
Get a spare lens and high-quality and effective lens for accurate and efficient laser cutting and laser engraving.
Endurance offers a full laser lens pack for your diode laser.
The accuracy of laser cutting and laser engraving depends on the laser lens quality.
The better lens – the better the result you will get.
A better lens means a better (smaller) laser beam spot.
If the lens is made out of plastics or is defective then it will not be useful for laser cutting or laser engraving.
The engraving will be blurred and fuzzy.
Endurance offers a laser lens pack for laser makers and professionals.
• Regular 3 element lens [installed by default] (black one)
• G2 lens (golden with a small lens)
• G7 lens (black)
• G8 lens (black)
Getting started with laser lens pack
3-element lens (Cleanest beam profile, best for low power lasers)
The 3-element lens has a long focal length, low divergence, and clean beam profile but it has a significant output loss.
Advantage Tight laser beam with the cleanest beam profile
Downsides 70% efficiency (1W diode = 700mw using this lens)
G2 lens (best for power)
The G2 is a single lens enabling the maximum true power of the laser diode for rapid close-range burning and engraving.
Advantage 95% efficiency, reduces the beam aperture
Downsides Increase the beam divergence (thickness) and the beam profile
G7 lens (Balanced Multi-Purpose Perfection)
This lens is a cross between the divergence and the power lens. With the G7, the beam divergence won’t increase as it does with the G2 and you will still get very close power of the laser diode.
Advantage 88% efficiency, long focal length and increases beam aperture.
Keep in mind that a low-quality Chinese lens might have some optical artifacts and other issues that might have a poor effect on laser cutting and laser engraving.
Laser engraving on plywood using G7 laser lens with Endurance 10 watt Delux.
All these lenses were designed by professional optics suppliers and tested in the Endurance laser lab.
| Parameters | 3 element laser lens | G2 laser lens |
| About the lens | Standard 3 element laser lens | Short focal G2 laser lens |
| Optimal focal range | 30-100mm | 5-30mm |
| Laser lens material | glass | glass |
| Size | M9 x 0.5mm x 10 | M9 x 0.5mm x 10 |
| Wavelength | 405-450nm | 400nm-700nm broadband coated |
| AR coating | + | + |
| Transparency | 82% | 94% |
| Components | 3 element lens | Single Element |
| Laser lens parameters | FL: about 8mm | Front Focus: 4.02mm |
| Lens Size: 6mm | Back Focus: 4.8mm | |
| Working Focus: 2.357mm | ||
| Naked Lens inside: 6.33mm(Diameter) | ||
| Divergence: 10.02mm | ||
| Glass Type | – | L-BAL35 |
| Frame material | Black metal | Golden metal |
| Laser power | 100mW ~ 10W | 100mW ~ 10W |
| The best tested focal range* | 63-67 mm | 32-33 mm |
| The smallest laser beam spot* | 85 x 130 microns (uM) | 65 x 130 microns (uM) |
| Parameters | G7 laser lens | G8 laser lens |
| About the lens | Multi focal G7 laser lens | Long focal G8 lens. |
| G7 Aspheric Glass lens | G8 Precision Glass Molding | |
| Optimal focal range | 20-100mm | 30-100mm |
| Laser lens material | glass | glass |
| Size | M9 x 0.5mm x 10 | M9 x 0.5mm x 10 |
| Wavelength | 400-700nm | 400-700nm |
| AR coating | + | + |
| Transparency | 90% | 91% |
| Components | Single Element | Element Aspheric |
| Laser lens parameters | EFL=8mm | EFL: 8mm |
| Laser lens thickness=2.3mm | NA: 0.20 | |
| NA=0.2 | ||
| CA=6.5 | ||
| BFL=5.67122 | ||
| Divergence: 8.8mm | ||
| Focal Length: 7mm | ||
| Glass Type | – | – |
| Frame material | Golden metal | Black metal |
| Laser power | 100mW ~ 10W | 100mW ~ 10W |
| The best tested focal range* | 83-85 mm | 70-75 mm |
| The smallest laser beam spot* | 88 x 130 microns (uM) | 77 x 130 microns (uM) |
* – those measurements were made in the Endurance laser lab.
Upgrading Chinese lasers with an Endurance air nozzle ver 2.0
Extra laser beam measurement
3 element lens
Focal range – 49.4 mm (2″)
Focal beam spot ~ 0.156 х 0.046 mm
G2 lens
Focal range 10.5 mm (2/5″)
Focal beam spot 0.134 х 0.052 mm
G7 without an extension spacer
Focal range 64.5 mm (2.5″)
Focal beam spot 0.321 х 0.058 mm (quite big)
G7 with an extension spacer
Focal range 19 mm (3/4″)
Focal beam spot 0.094 х 0.041 mm
G8 without an extension spacer
Focal range 84.1 mm (3.3″)
Focal beam spot 0.442 х 0.052 mm (quite big)
G8 with an extension spacer
Focal range 19.7 mm (3/4″)
Focal beam spot 0.104 х 0.075 mm
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