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Blu-ray Laser !!!
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Wed Oct 22, 2008 5:23 pm    Post subject: Reply with quote

Tekwiz wrote:
Alan wrote:
Tekwiz wrote:
Good stuff on the diode modules. I have one on the way, & am looking forward to it's arrival. This will be my first 405nm laser, although I have several red & green solid state lasers. I am also almost done building a 15W CO2 laser. I am considering building a 3 color laser 'spirograph' for a christmas decoration. Wink


Is the 15W a complete DIY project or did you purchase a starter kit? Either way I would love to see details of the build when you are complete!


Actually, I purchased the tube, & built the rest, including a custom aluminum case & cooling system. The laser is basically complete, but my original power supply design failed on powerup, & is on the bench being rebuilt. The tube requires ~9kv @ 15ma, with a 16-18kv start voltage. I am using a 2 stage, 8 step voltage multiplier, driven by a microwave oven transformer. The multiplier is designed with much larger caps in the first 3 steps, so that it provides ~16kv until the tube ionizes & begins to draw current, at which point the second stage(5 steps) gets swamped out & the first stage(3 steps) supplies operating current @ ~8-9kv. I have tons of pix of the build process, if you are interested.


Fantastic. Cool This really sounds like an incredible mad scientist device. Some pictures would be great!
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Tekwiz
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Joined: 20 Oct 2008
Posts: 36
Location: Vancouver Island

PostPosted: Thu Oct 23, 2008 1:52 pm    Post subject: Reply with quote

No prob. Enjoy.


The quest begins here, with the arrival of the laser tube.


This heat sink assembly was converted into a heat exchanger by adding a welded aluminum box & pipe threads to the back. Necessary as the tube is water cooled.


This is the cabinet, with the major power supply & cooling system components mounted.



This is a shot of the cooling system pump & reservoir. The reservior is a thinwall stainless steel tank, from a water cooler.


This shows the heat exchanger mounted.


This shows the cabinet mostly complete, with the heat exchanger mounted.


Here is the inside of the cabinet, with most components mounted.


Here is the front panel, with the tube deck lid closed.


This shows the tube deck & mounting brackets.


The voltage multiplier module.


The completed cooling system, installed.


This shows the ballast resistor array, as well as the AC input socket & remote control plug. The brass fitting in the middle of the tube deck is to access the cooling system for filling & draining. The cooling system is totally sealed & does not require periodic topping up.


A close up of the first stage capacitor module. This connects to the voltage multiplier board, & contains the caps that provide the tube operating current.


The laser is physically complete in this shot.


This end contains the air intake filter, as well as the beam exit port.


A shot of the tube deck, with the tube installed.

Currently, I have the VM board on the bench, where I hve just replaced the 32 1N4007s, that I originally used, with 8 microwave oven diodes. Hopefully, this time it will work. Very Happy
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Alan
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Location: Winnipeg, MB

PostPosted: Thu Oct 23, 2008 8:36 pm    Post subject: Reply with quote

That is a work of art, nice job on the control panel! Very Happy
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Alan
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PostPosted: Thu Oct 23, 2008 8:37 pm    Post subject: Reply with quote

LOL, I just noticed your custom warning label (bottom right) Laughing
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Tekwiz
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Joined: 20 Oct 2008
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Location: Vancouver Island

PostPosted: Fri Oct 24, 2008 1:55 pm    Post subject: Reply with quote

Thanx. I couldn't resist the warning label. I also have to rework my metering, as the power supply fault took out both DPMs & their associated circuitry. However, I plan to get the thing lasing properly before I worry about metering.
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aceman500
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Joined: 26 Oct 2008
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PostPosted: Sun Oct 26, 2008 11:15 am    Post subject: Current regulation Reply with quote

How are you going to limit the current to the tube. A microwave oven transformer is kinda a brute force beast and can put out a 1/2 Amp or more before burning itself up or other components. I used a neon sign transformer on my CO2 laser that has been rectified and filtered in addition to ballast resistors. Neon sign transformers are designed to not deliver any more current than they are rated, so they are kinda self regulating. In fact you can short one out with no problems. After all they are built for gas discharge tubes which a CO2 laser is. Also how many watts are you expecting? I'm getting about 25 watts from mine however its maximum design is supposed to be about 40watts.

Look's Great! I can't wait to see it "FIRE" up!
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Tekwiz
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Joined: 20 Oct 2008
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Location: Vancouver Island

PostPosted: Sun Oct 26, 2008 2:28 pm    Post subject: Reply with quote

The current will be limited somewhat by the voltage multiplier. However, I have included a ballast resistor bank, which I plan to tap at the spot which gives the correct operating current. The resistor bank is sized so that it will absorb half of the operating voltage, at the tubes proper current rating. I am hoping that this is enough. Should this supply design not work, I am planning to replace it with a simple rectified transformer, based on a 10kV, 22ma oil burner ignition transformer. Ign transformers are rated for arc duty, just like NSTs, & I have a few kicking around.
Your tube is a 40W? Quite a bit larger than mine. Have you acquired focus optics for it? My tube is a 15W, & I am expecting full wattage from it. From what I understand, they will deliver quite a bit more than rated power, at a cost of reduced lifespan. I saw one 40W online, running at better than 75W output. That's fine for those who get their tubes donated, but not for us who have to pay for them.
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aceman500
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Joined: 26 Oct 2008
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PostPosted: Mon Oct 27, 2008 10:17 am    Post subject: CO2 Laser Reply with quote

An oil burner transformer should do well too. Yes I got a ZeSe focusing lens from ebay, and I can vaporize brick with it. It's so dam bright it's like a welders arc, you can't look at it. I also recommend a variac transformer to give you some control of voltage. As far as my tube, I constructed it myself (it's not that hard), and the equation's worked out to be about 40 watts, but that's in a perfect world. I'm happy with my 20-25 watts for now, and I'll try to improve it the next round.

Perhaps I should just shut up and post some pictures of my setup..
I'll see if I can get to it in the next day or so.
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Alan
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Location: Winnipeg, MB

PostPosted: Mon Oct 27, 2008 10:38 am    Post subject: Re: CO2 Laser Reply with quote

aceman500 wrote:
An oil burner transformer should do well too. Yes I got a ZeSe focusing lens from ebay, and I can vaporize brick with it. It's so dam bright it's like a welders arc, you can't look at it. I also recommend a variac transformer to give you some control of voltage. As far as my tube, I constructed it myself (it's not that hard), and the equation's worked out to be about 40 watts, but that's in a perfect world. I'm happy with my 20-25 watts for now, and I'll try to improve it the next round.

Perhaps I should just shut up and post some pictures of my setup..
I'll see if I can get to it in the next day or so.


Hi Aceman,

Welcome to the forum. Smile You need to make a video of the laser vaporizing a brick! I would love to see that. Shocked
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Tekwiz
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Joined: 20 Oct 2008
Posts: 36
Location: Vancouver Island

PostPosted: Mon Oct 27, 2008 2:06 pm    Post subject: Re: CO2 Laser Reply with quote

aceman500 wrote:
An oil burner transformer should do well too. Yes I got a ZeSe focusing lens from ebay, and I can vaporize brick with it. It's so dam bright it's like a welders arc, you can't look at it. I also recommend a variac transformer to give you some control of voltage. As far as my tube, I constructed it myself (it's not that hard), and the equation's worked out to be about 40 watts, but that's in a perfect world. I'm happy with my 20-25 watts for now, and I'll try to improve it the next round.

Perhaps I should just shut up and post some pictures of my setup..
I'll see if I can get to it in the next day or so.


Yeah, I'd like to see some pix, too. I take it that your laser is a flowing gas type, as opposed to a sealed tube like mine? I had given some thought to tube construction, but I was unsure whether normal machining tolerances were close enough, especially for a sealed tube. I know about vaporizing brick...I have a firebrick for a beam stop for my laser. You don't want to be testing a laser, only to find that you just set your neighbor's house on fire. Oops.
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bandtled
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Joined: 06 Aug 2008
Posts: 7

PostPosted: Sun Nov 09, 2008 12:17 am    Post subject: Reply with quote

A little off topic with the CO2 laser in this thread, unless it's a 405nm CO2. Wink

Don't forget to check out these listings for 405nm and 650nm high powered diodes and modules.
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bandtled
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Joined: 06 Aug 2008
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PostPosted: Sun Feb 15, 2009 3:25 am    Post subject: Reply with quote



NEW LISTING
. Included JAV driver kit, just add voltage.
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