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My personal laser concept

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Hey everyone, I have been a part of the laser community for about 10 years but have been very inactive for a long time. When I heard about the new blue laser diodes it didn't take me long to start building a few. My current favorite that I will be showing you in a video is a 3.5 W 445nm laser. I originally planned to put it in a project box but I actually began to like having it as a big ball of tape lol. But any way what I want to show you are two key features that I think will be appreciated and may help give others ideas. Like I said it has been a while since I have been around so people might be doing this now but I never seen it. One feature is how compact it is but yet has decent battery life. I have another one that is even smaller but not as cool :). The other feature is the ability to adjust the lens with a switch.


https://www.youtube.com/watch?v=6mU1ueJO3D0
 
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starlight

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Very cool like the focus motor. How did you make the motor reverse, or what did you use for it? Video is very hard to see and only shown quickly
 
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The motor is wired to a momentary DPDT switch which makes it reverse the polarities thus changing direction of the motor. The motor has a timing belt wrapped around the lens. I did try an actual timing belt but it didn't work. A strip of gorilla tape works great.

https://www.youtube.com/watch?v=fayAvNI5eEI&index=1&list=UUTa-Ah8vRNh_y2TGTxZGFLQ

The 2 pennies are there to help keep tension in the timing belt
 

bdgreenb

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Love the powered focus. How are you heat sinking the module edit: nvm I see you are using those classic fleabay hs, those don't have that much mass, what's the duty cycle? Do you have any pics before it became a ball of tape?
 
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yea the heat sink is small. I was going for portability over duty cycle. I can run it for about 20 seconds tops. I do plan to get a nice big chunky heat sink once I get my hands on a NDB7A75 diode. I do not have any pictures from its previous state but you are not missing much. I did not premeditate the design to much so it is sloppy. I figure I just put a shell of tape on it to hold it together. Pretty much what I did was mount all the components on top of the battery pack. Simple, crude, but powerful and very compact. I wouldn't sell such a design but it fits what I wanted and I am happy with it.
 

Lazerbeak

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Points for the focus :beer: I was thinking about a powered focus, but it involved gearing and seemed complex. This is a very cool solution.

Thank you for sharing!

~ LB
 
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my first idea was to use a motor like this. Basically it would be a square with a rotating silicone o ring in the middle where the lens would go. Im sure there is something out there like that but I have not a clue of what it is called or where to get one.
 

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MrBland

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I really like that concept! Thanks for sharing, hopefully some enterprising producers will pick this idea up and perfect it in a unit!
 




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