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Old 10-08-2015, 02:00 PM #1
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Default how to focus a big spot ?

hi,

i am from germany, and i am a new user here

i want to build a additional lasermodule for my cnc machine.

the following items are using:

- Nichia NDB7875
- 2.4A X-Drive V6 Laser Driver
- 405-G-2 Glass Lens
- Adjustable brass laser diode housing (ebay 161804830486)
- a 20W peltier cooler

now, it works together, but my problem is, that i cant get a small laser line and a fine point at a distance. i can 'engrave' wood in ~40mm

in a distance longer than 1m the spot is very big (in 1m ~100mm spot size)

what can i do ? which parts are missing ?

Greetings


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Old 10-08-2015, 02:15 PM #2
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Default Re: how to focus a big spot ?

Quote:
Originally Posted by equal View Post
hi,

i am from germany, and i am a new user here

i want to build a additional lasermodule for my cnc machine.

the following items are using:

- Nichia NDB7875
- 2.4A X-Drive V6 Laser Driver
- 405-G-2 Glass Lens
- Adjustable brass laser diode housing (ebay 161804830486)
- a 20W peltier cooler

now, it works together, but my problem is, that i cant get a small laser line and a fine point at a distance. i can 'engrave' wood in ~40mm

in a distance longer than 1m the spot is very big (in 1m ~100mm spot size)

what can i do ? which parts are missing ?

Greetings
Can you take a picture of what you see? What happens when you adjust the focus by turning the lens? Also make sure you have the lens in the right way.

Last edited by Apocalypse; 10-08-2015 at 02:15 PM.
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Old 10-08-2015, 03:16 PM #3
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Default Re: how to focus a big spot ?

Appears to me your lens is focused to a fine burning point for close in work. If your work is 1 meter or more away I would expect the lens to be out of focus for that far out producing a large spot due to spreading. I don't know if your current lens can be focused to a point 1 meter away to allow it to be small enough to burn, pictures would help.

Infinity focus will produce a tight beam which can travel a long distance with minimal spreading, but focusing to a spot produces the most energy for burning, however past the point of focus the beam will spread out again, that is why you are seeing a big spot 1 meter away.
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Last edited by Alaskan; 10-08-2015 at 03:22 PM.
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Old 10-08-2015, 03:43 PM #4
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Default Re: how to focus a big spot ?

uh ... it is very tricky to make good pics with protection glasses and my mobile phone, but ive got it (i hope)

look at the pictures in attachement. this is the best and smallest focus.
With the protection glasses, the point is smaller ...

greetings

for making pictures i used a low current (not the full power)
Attached Thumbnails
how to focus a big spot ?-dsc_0205.jpg   how to focus a big spot ?-dsc_0212.jpg   how to focus a big spot ?-dsc_0206.jpg   how to focus a big spot ?-dsc_0209.jpg   how to focus a big spot ?-dsc_0210.jpg  


Last edited by equal; 10-08-2015 at 03:47 PM.
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Old 10-08-2015, 03:48 PM #5
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Default Re: how to focus a big spot ?

The multimode diodes have one axis that diverges a lot more rapidly than the other.
So short of a cylindrical pair to reshape the beam followed by a telescope set the easiest thing to do is move it closer to your work piece.

You could go with a 405 or other single mode diode, that will give you a very tight beam that's easier to focus tight at 1 meter.

Or just use a C02 set up, they are getting cheap.
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Old 10-08-2015, 04:15 PM #6
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Smile Re: how to focus a big spot ?

with a gray filter i have taken this picture...

it is the "Nexus" beam
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Old 10-08-2015, 07:44 PM #7
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Default Re: how to focus a big spot ?

A "16X" single mode 800mw 405nm laser diode will focus to a very fine spot at a greater distance, I just don't know how long such can be used in a CNC laser setup, I suppose if the Peltier cooler keeps the diode cool enough, that isn't a factor?
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Old 10-09-2015, 12:17 AM #8
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Default Re: how to focus a big spot ?

Quote:
Originally Posted by equal View Post
uh ... it is very tricky to make good pics with protection glasses and my mobile phone, but ive got it (i hope)

look at the pictures in attachement. this is the best and smallest focus.
With the protection glasses, the point is smaller ...

greetings

for making pictures i used a low current (not the full power)
Is the lens securely in place? It may be the lighting but the lens looks weird. Put the lens in without the silver ring and slowly turn it until you get your desired point. Then put silver ring on and lock it in place. Focus it far away and not close to you. The side of the lens where the glass is on faces towards the diode.
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Old 10-12-2015, 08:44 AM #9
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Default Re: how to focus a big spot ?

thanks all,

the lens is correct in place, my problem is that the lens is touching the diode. i can not put it closer.

after some tinkering: i can focus to a low distance to engrave wood, thats ok for me,

but a small and tight spot is not possible

greetings
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Old 10-12-2015, 09:22 AM #10
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Default Re: how to focus a big spot ?

Have you tried flipping the lens barrel around backwards? The glass-lens side of the lens-barrel should be closest to the laser diode. If both sides have glass for some reason, try flipping it around to see if it helps.
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Old 10-12-2015, 01:02 PM #11
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Default Re: how to focus a big spot ?

no,

i do not.

I thought that the new 405-G2 Glass lens is supplied correctly .. i will try

greetings
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Old 10-12-2015, 01:35 PM #12
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Default Re: how to focus a big spot ?

Quote:
Originally Posted by equal View Post
with a gray filter i have taken this picture...

it is the "Nexus" beam
Your lens looks like it is in correctly as long as you are screwing the end without the slots in first which is with the glass closest to the diode. See this for spot size you can expect.
There is Something "Wrong" With My Beam/Spot

Can you take the lens out and get a picture of the raw output of the diode on a wall as that output looks a bit distorted but not sure if it is the camera or how it is.
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