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Old 05-07-2013, 05:50 PM   #1
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Default The Schematic of a Laser (HELP)

Hello, new to the forums but not new to the love of physics!
I am a fellow physicist with no knowledge of currents and the language of electro-magnetic energy , yet. I am highly interested in constructing a laser that is more powerful than 1000mW (1W); to be around 1.7 - 2.5 watts.
I am fully aware that you must buy a diode , driver, host, heatsink, and battery.
I just wanted to know what the theory is behind to increase output power above 1W. Do you have to buy a bigger driver? Bigger host? More less/more conductive heatsink? I just want to some expert advice because I can complete a build of one if someone can lead me up the road behind laser module theory and what is the MO of required parts to construct one; to ultimately increase output power for each future build. I hope everyone can help me out and hope people are in the same boat. As always, thank you for your time and keep on photonin'
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Old 05-07-2013, 06:45 PM   #2
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Default Re: The Schematic of a Laser (HELP)

To get more power out of the 445nm diodes you see here just increase the current, then the power output will increase.
Most drivers can do around 100mA-1.8A, if your driver is not capable of those current you can run them in parallel.

However, when you increase the current the system will produce more heat so a bigger heat sink is recommended, on both the diode and the driver. Aluminium is fine, the upgrade to copper will not produce an appreciable difference in run time.

It also helps to use a lens that transmits more light (G1, G2)

Last edited by ARG; 05-07-2013 at 06:45 PM. Reason: spelling
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Old 05-07-2013, 10:21 PM   #3
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Default Re: The Schematic of a Laser (HELP)

Thank you for the response. So if I wanted the output to 2W , I would get ANY M140 diode? And what driver should I get based on the output? Is there a set limit to all drivers to limit short circuit? How do you know how a part will coincide with each other or are they all universal and will work within the range the part supports? I just need to know a little more fundamentals about diodes and all other necessary equipment for builds. I'm guessing bigger the battery more life and output power. Also I want to know what limits the energy of a 1W compared to a 2W via energy cell. Thanks
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Old 05-07-2013, 10:29 PM   #4
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Default Re: The Schematic of a Laser (HELP)

Those drivers that can push out 1.8A should be able to push that M140 to 2W+ provided you use a G1 or G2 lens.

For the other info, you should search for that information yourself on the forum.
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Old 05-07-2013, 10:39 PM   #5
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Default Re: The Schematic of a Laser (HELP)

Any M140 at 1.8A will do, a 9mm diode at 1.8A will also work.

The driver you need depends on the battery setup you want to use, get a buck/linear driver for 2-3 cell builds and a boost driver for single cell builds.
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Old 05-08-2013, 03:56 AM   #6
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Default Re: The Schematic of a Laser (HELP)

I'm still stuck on this sentence:

Quote:
Originally Posted by S1lent View Post
I am a fellow physicist with no knowledge of currents and the language of electro-magnetic energy
My head hurts.
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Old 05-08-2013, 03:28 PM   #7
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Default Re: The Schematic of a Laser (HELP)

Must be a theoretical physicist....
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Old 05-08-2013, 06:35 PM   #8
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Default Re: The Schematic of a Laser (HELP)

Quote:
Originally Posted by Sigurthr View Post
I'm still stuck on this sentence:



My head hurts.
Sorry to be vague but I know about amps, ohms, volts, etc.
Besides if you know anything about physics there's a quite variety of sub categories .
(Particle physics (aka) lasers; quantum physicist ; Newtonian physics; modern physics; astro physics. I am more into astro physics and Newtonian; where we don't deal with the business of lasers but more of using stellar parallax and radio waves to find out distances to stars; pulsars; etc.
I do have some knowledge of particle physics but not enough to building a laser by myself with some computer parts without help.
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Old 05-08-2013, 06:43 PM   #9
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Default Re: The Schematic of a Laser (HELP)

Quote:
Originally Posted by ARGLaser View Post
Any M140 at 1.8A will do, a 9mm diode at 1.8A will also work.

The driver you need depends on the battery setup you want to use, get a buck/linear driver for 2-3 cell builds and a boost driver for single cell builds.
So if I get a m140 diode G2, which can handle above 2W+.
All I need to do is get a driver; which can resist at 1.8+ ohms and handle enough cell energy to be capable of producing that?
Is there a limit on how much a diode can produce?
Thank you all for your help as I am almost capable of doing this.
Can some link me parts just capable of producing 1.5w+ via hand held.
Thank you for all your precious time!
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