Laser Lenses  @ Circadea
s
Jtech
Optlasers
https://www.youtube.com/watch?v=1ZuVE6biIjM&feature=emb_logo
Various Diameters
Video
https://endurancelasers.com/an-endurance-laser-lens-pack/
Lens Type
 Uses
 Price
G2
 It is a focusable Dot collimating lens, assembly by 405-G-2 glass lens and M9*0.5 housing.
Short FocusThe 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  Increases the beam divergence (thickness) and affects the beam profile

~$14
G5


G7
 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.

88% efficiency, long focal length and increases beam apertrue 


G8
 Cutting
The transparence ratio of the normal collimation lens of the market is around 80-90% due to the long focus distance.The original laser diode's light is diffused. A long focus lens will bring more power .The normal collimation lens's focus is 7-8mm but this lens' focus is around 2.357mm.So,the power lost will be less and the beam effect is the best!  https://www.youtube.com/watch?v=pY_7MC39qCY		 ~$18
 Link

Link
3 Element Lens
 Adjustable focusAdvantage

Tight laser beam with the cleanest beam profile
Downsides  70% efficiency (1W raw output from the laser diode would be down to 700mw)






Parameters

3 element laser lens

G2 laser lens

G7 laser lens

G8 laser lens

S16 Focusing
About the lensStandard 3 element laser lensShort focal G2 laser lenshttps://odicforce.com/9mm-x-05mm-Thread-PMMA-Laser-Focusing-Lens-2-packMulti focal G7 laser lensLong focal G8 lens.

Mounted lens set with focus adjustment.

  • Lens Material: Single element; Coated optical glass
  • Lens Holder: 9mm x 0.5mm thread, 10mm thread length
  • EFL (Effective Focal Length):9.0mm
  • CA (Central Aperture):5.2mm
  • SD (Diode to lens):6.9mm
  • NA (Numerial Aperture):0.3mm
  • Coating:405-450nm; Transmittance ratio: 95%

Designed for high power blue and blue/violet laser diode engravers.


G7 Aspheric Glass lensG8 Precision Glass Molding
Optimal focal range30-100mm5-30mm20-100mm30-10mm





Laser lens materialglassglassglassglass





SizeM9 x 0.5mm x 10M9 x 0.5mm x 10M9 x 0.5mm x 10M9 x 0.5mm x 10





Wavelength405-450nm400nm-700nm broadband coated400-700nm400-700nm





AR coating++++





Transparency70%96%85%90%





Components3 element lensSingle ElementSingle ElementElement Aspheric





Laser lens parametersFL: about 8mmFront Focus: 4.02mmEFL=8mmEFL: 8mm
Lens Size: 6mmBack Focus: 4.8mmLaser lens thickness=2.3mmNA: 0.20

Working Focus: 2.357mmNA=0.2

Naked Lens inside: 6.33mm(Diameter)CA=6.5

Divergence: 10.02mmBFL=5.67122


Divergence: 8.8mm


Focal Length: 7mm
Glass Type–L-BAL35––





Frame materialBlack metalGolden metalGolden metalBlack metal





Laser power100mW ~ 10W100mW ~ 10W100mW ~ 10W100mW ~ 10W
The best tested focal range*63-67 mm32-33 mm83-85 mm70-75 mm
The smallest laser beam spot*85 x 130 microns (uM)65 x 130 microns (uM)88 x 130 microns (uM)77 x 130 microns (uM)