240 mW laser pointer for $189 - what do you think about it?
Posted by Howie
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Re: 240 mW laser pointer for $189 - what do you think about it? July 11, 2009 11:30AM |
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...safety (goggles) firstQuote
THANK YOU!
And no, I won't say anything about the laserdiodes again, I've already did
'sid
PS what's that with little boys and fancy coloured lasers anyway?
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Re: 240 mW laser pointer for $189 - what do you think about it? December 21, 2009 09:06AM |
... it would work, if you manage to focus all beams in one spot - then you'll add up all the power 
I had to build an justage-stage for ring-focus-lasers ... here they combined 80 diodes with 20 Watts power each to a 'single' 1600 Watt-laser
Viktor
I had to build an justage-stage for ring-focus-lasers ... here they combined 80 diodes with 20 Watts power each to a 'single' 1600 Watt-laser
Viktor
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Re: 240 mW laser pointer for $189 - what do you think about it? December 23, 2009 03:00AM |
... a diode-laser with 1 Watt power won't cut white paper!
You have to use dark/absorbing paper or plastic-sheets - for this common cutting systems (or LOM) uses CO2-lasers.
It's the wavelenghth: - diodes are between 800nm and 1070nm, CO2 emits around 10064nm, what's very good interacting with organic materials and metal.
I have a 975nm-1Watt-diodelaser with atached glass-fiber+optical head and a resulting focus of 60 microns (much better than most common optics) and have trouble cutting white plasticsheets or paper
With my 50Watt-fiberlaser with 1070nm and a spot around 20 microns i can cut white paper with 2Watts power setting, but not really fast
So for a cutting system you need much more power or you're limited to dark materials only ...
Viktor
You have to use dark/absorbing paper or plastic-sheets - for this common cutting systems (or LOM) uses CO2-lasers.
It's the wavelenghth: - diodes are between 800nm and 1070nm, CO2 emits around 10064nm, what's very good interacting with organic materials and metal.
I have a 975nm-1Watt-diodelaser with atached glass-fiber+optical head and a resulting focus of 60 microns (much better than most common optics) and have trouble cutting white plasticsheets or paper
With my 50Watt-fiberlaser with 1070nm and a spot around 20 microns i can cut white paper with 2Watts power setting, but not really fast
So for a cutting system you need much more power or you're limited to dark materials only ...
Viktor
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Re: 240 mW laser pointer for $189 - what do you think about it? December 23, 2009 04:41AM |
... it's something more complicated
White paper is diffuse reflecting most of the radiation.
When the energy is high enough (or long enough present), the paper changes colour to brownish ... then you have much better absorption ... so when going over a specific absorption-rate, it's burned away at once.
It's something of a 'drastic overreaction' at an relatively undefined point when the absorption changes with time.
When applying constant energy, the brown/black area absorbs nearly all present energy and burns much wider than the diameter of the laserspot
So you have to apply pulses instead of CW or you can't handle it precise enough between "no cut" and "burn a big hole".
On the other hand it should be possible to draw/print a black line on the paper and scan over the paper or better follow the line with the pulsing diode ...
Viktor
White paper is diffuse reflecting most of the radiation.
When the energy is high enough (or long enough present), the paper changes colour to brownish ... then you have much better absorption ... so when going over a specific absorption-rate, it's burned away at once.
It's something of a 'drastic overreaction' at an relatively undefined point when the absorption changes with time.
When applying constant energy, the brown/black area absorbs nearly all present energy and burns much wider than the diameter of the laserspot
So you have to apply pulses instead of CW or you can't handle it precise enough between "no cut" and "burn a big hole".
On the other hand it should be possible to draw/print a black line on the paper and scan over the paper or better follow the line with the pulsing diode ...
Viktor
Re: 240 mW laser pointer for $189 - what do you think about it? December 23, 2009 07:05AM |
Thinking about the bubblejet principle where a bubble is created by electrical heaters, could we have a laser addressing an array of tiny receptacles creating the heat to form the bubble, I have probably not explained this very well.
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Re: 240 mW laser pointer for $189 - what do you think about it? July 16, 2010 05:10AM |
240 mW laser pointer for $189? now,200 mW 532nm laser pointer only for $53.99? you can have a look for Amazon and Electronic Gadgets.><
Edited 1 time(s). Last edit at 09/10/2010 07:09AM by howard.
<Edited 1 time(s). Last edit at 09/10/2010 07:09AM by howard.
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Re: 240 mW laser pointer for $189 - what do you think about it? August 27, 2010 04:32PM |
... this are pulsed diodes with duty-cycles of 0.1%, so you have to divide the average power by 1000 ... it means a "pulsed 25Watt-LD" emits only 25mW optical power when averaged
Viktor
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Viktor
--------
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Call for the project "garbage-free seas" - [reprap.org]
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Re: 240 mW laser pointer for $189 - what do you think about it? August 28, 2010 04:17PM |
240mW for $189?
I have some 25Watt, yes, 25000mW
diodes for sale ... just 250$ plus shipment ...
You can see it in action here:
25W laser diode
I have some 25Watt, yes, 25000mW
diodes for sale ... just 250$ plus shipment ...You can see it in action here:
25W laser diode
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Re: 240 mW laser pointer for $189 - what do you think about it? August 29, 2010 12:28PM |
... different cooling options available:
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Re: 240 mW laser pointer for $189 - what do you think about it? November 06, 2014 09:20AM |
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VDX
... it would work, if you manage to focus all beams in one spot - then you'll add up all the power
I had to build an justage-stage for ring-focus-lasers ... here they combined 80 diodes with 20 Watts power each to a 'single' 1600 Watt-laser
Viktor
Is this the sort of product you were involved with?
[www.ringfocus.de]
Kalle
--
Lahti, Finland
The only stable form of government is Open Source Government. - Kalle Pihlajasaari 2013
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Re: 240 mW laser pointer for $189 - what do you think about it? November 06, 2014 11:23AM |
... no, I then had to design the manufacturing/aligning/adjusting rig for the diodes for this company, but even then I found this type of bundling much too inefective and expensive
My bundling heads are much smaller and simpler -- and I can combine some hundred fiber-ends in a grapefruit-sized package with a single optical head to receive the same overall energy on a much smaller spot too
Viktor
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Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]
Call for the project "garbage-free seas" - [reprap.org]
My bundling heads are much smaller and simpler -- and I can combine some hundred fiber-ends in a grapefruit-sized package with a single optical head to receive the same overall energy on a much smaller spot too
Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]
Call for the project "garbage-free seas" - [reprap.org]
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Re: 240 mW laser pointer for $189 - what do you think about it? November 07, 2014 06:03PM |
And the URL to the repo with the CAD drawings and documentation for this bundling head?
From FreeCAD To The Real World- Demo video using FreeCAD and featuring the Smartrap 3D Printer
From FreeCAD To The Real World- Demo video using FreeCAD and featuring the Smartrap 3D Printer
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Re: 240 mW laser pointer for $189 - what do you think about it? November 07, 2014 06:13PM |
... classified
Viktor
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Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]
Call for the project "garbage-free seas" - [reprap.org]
Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]
Call for the project "garbage-free seas" - [reprap.org]
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