2.4W 808nm Laser Diode

Discussions on optics for laser cutter/engravers

2.4W 808nm Laser Diode

Postby ricklaser » Tue May 25, 2010 12:32 am

Hey all,
I've been intersted about laser diodes, so two month ago I bought one 290mw 808nm to test, it burn things but for those who are familiar with lasers 80w that was a bit disappointing..... so 2 weeks ago i bought a 2.4W 808nm and today i got it, wel now i´m wondering with lasers diodes :) although the original optical make a spot of 1.5mm it burn hard, see a small video that i did today , now i ll instal another lens forward the original collimator , it will give me about 0.2mm spot , it will rock´s.
Last edited by ricklaser on Fri May 28, 2010 11:40 am, edited 1 time in total.
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Re: 2.4W 808nm Laser Diode

Postby bdring » Tue May 25, 2010 1:50 am

Cool. 8-)

Give some more details about where you got it and the power requirements.
Bart
"If you didn't build it, you will never own it."
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Re: 2.4W 808nm Laser Diode

Postby ricklaser » Tue May 25, 2010 6:59 pm

bdring wrote:Cool. 8-)

Give some more details about where you got it and the power requirements.

i got it from o-like , http://www.o-like.com $250 + $30 DHL . The driver require 5V x 3.0A - 3.5A from a good power supply , u can c my power supply in video.
The driver have 4 wires, 2 power supply - 2 TTL control . if u don´t want use TTL forguet this one, use only power terminal. Now i need find a lens to reduce spot from 1.5mm to 0.2 mm.
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Re: 2.4W 808nm Laser Diode

Postby lasersafe1 » Tue May 25, 2010 8:03 pm

BE VERY CAREFUL with 808nm! It is at the edge of the visible spectrum and can fool you quite easily. It appears as a faint dim light even though it can be very intense in power. 808nm is in the retinal hazard zone, so there is an optical gain of 100,000 when it enters the eye and focuses on the retina. 10mW/cm2 at the pupil would become 1KW/cm2 focused on the retina. Even diffuse reflections from something you are burning could easily exceed this power, so laser protective eyewear is required. By the way you were "looking" for the burn, I'm doubting that you were wearing eyewear. I hope you were!

What do you think could have happened if you hit the metal disc in the middle of your floppy? You had it angled right toward you! I hate to have to yell at you like this, but you are being very foolish and it is not wise to show such foolishness to others who might think it's okay to do this. I recommend you remove the video. We aren't kids bragging about what we can burn!

How fast can you blink? .25 seconds is the average aversion response time. A 10mW visible laser can put thermal burns on the retina in this time period. You are dealing with 2.5 watts! There is no doubt you could be blinded.
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Re: 2.4W 808nm Laser Diode

Postby ricklaser » Tue May 25, 2010 8:50 pm

lasersafe1 wrote:BE VERY CAREFUL with 808nm!

Thanks for post, its realy dangerous in wrong hands( or better wrong brains...) well , i work with Co2 lasers sinse 1985 and i have many lasers and three laser machines ,15W, 50W, 80W and a 200W , i never handle laser without goggles, i have goggles to all wavelenght.
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Re: 2.4W 808nm Laser Diode

Postby Ben » Wed May 26, 2010 12:23 am

How come you chose a 2.4w laser for burning (and presumably cutting)? I’ve seen 808nm 30w fiber coupled lasers on Ebay for half of what you paid although they didn’t include power supplies or cooling.
-Ben

My Lasers:
40w CO2 Laser (Chinese Glass Tube), Directed Energy Inc. 30w RF CO2 Laser (Needs Repair), Laakmann Electro-Optics 20w RF CO2 Laser (Needs Repair), 7-10w RF CO2 Laser
Coherent 12w 808nm FAP LASER DIODE
MELLES GRIOT He-Ne Laser
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Re: 2.4W 808nm Laser Diode

Postby ricklaser » Wed May 26, 2010 12:49 am

Ben wrote:How come you chose a 2.4w laser for burning (and presumably cutting)? I’ve seen 808nm 30w fiber coupled lasers on Ebay for half of what you paid although they didn’t include power supplies or cooling.

well..... 30W diode + expensive driver + expensive optics + expensive 3V - 40A high quality power supply + heatsink + ...... , .......

I sale Co2 laser tubes, power supply, optics and laser machines, i bought that 2.4W diode to sale ,and i just sold it to a guy who will use in a router cnc to cut balsa, and engrave as hobby , now i will buy more two 2.4W.
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Re: 2.4W 808nm Laser Diode

Postby Ben » Wed May 26, 2010 1:28 am

If you want a professional setup then yes it will be expensive.

But……

If you’re willing to piece things together you can actually build one at a considerably smaller expense. For example:

$100 - Coherent 808nm 12W BURNING LASER DIODE FAP COHERENT
$30 - Thermoelectric Laser Diode Cooler & TEC Driver 30A
$40 - Vicor 5VDC 40A PSU
$75 - Fiber coupler, Red aiming diode, and safety shutter assembly
I’m still searching for a good deal on a driver for the laser.
-Ben

My Lasers:
40w CO2 Laser (Chinese Glass Tube), Directed Energy Inc. 30w RF CO2 Laser (Needs Repair), Laakmann Electro-Optics 20w RF CO2 Laser (Needs Repair), 7-10w RF CO2 Laser
Coherent 12w 808nm FAP LASER DIODE
MELLES GRIOT He-Ne Laser
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Re: 2.4W 808nm Laser Diode

Postby lasersafe1 » Wed May 26, 2010 12:20 pm

Ben wrote:If you want a professional setup then yes it will be expensive.

But……

If you’re willing to piece things together you can actually build one at a considerably smaller expense. For example:

$100 - Coherent 808nm 12W BURNING LASER DIODE FAP COHERENT
$30 - Thermoelectric Laser Diode Cooler & TEC Driver 30A
$40 - Vicor 5VDC 40A PSU
$75 - Fiber coupler, Red aiming diode, and safety shutter assembly
I’m still searching for a good deal on a driver for the laser.



Ben, I hate to break the bad news to you, but the 12W FAP or even the 30W FAP that you see on ebay will not make you a "professional" setup. The FAP is a diode array. It is only designed for pumping a laser crystal that is in a separate precision cavity. As such, it doesn't ever need to be focused down to a spot. It actually CANT BE FOCUSED to a spot any smaller than the emitting apertures of the separate emitters in the array. It's physics.
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Re: 2.4W 808nm Laser Diode

Postby Ben » Thu May 27, 2010 11:31 pm

Certainly not professional but that’s not to say it can’t burn or cut; granted the spot size would be far from ideal. Although with the proper setup it could also be used to make a pretty wicked green laser.
-Ben

My Lasers:
40w CO2 Laser (Chinese Glass Tube), Directed Energy Inc. 30w RF CO2 Laser (Needs Repair), Laakmann Electro-Optics 20w RF CO2 Laser (Needs Repair), 7-10w RF CO2 Laser
Coherent 12w 808nm FAP LASER DIODE
MELLES GRIOT He-Ne Laser
Ben
 
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