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power supply laser burner

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really what i want help with is what diode can i buy to replace the one i was trying to extract from the dvd burner. Has to be under $15 because i don't think i it is worth spending more on a project like this.
You might be able to get some old DVD burners/parts from a computer repair shop if you ask nice.
 

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look guys I'm sorry i am just an amateur at all this laser stuff. 1. i built a constant current driver.
2. because the driver i built was supposed to be cheap not efficient a lot of the power going though it gets turned to heat that is why I'm using a power supply instead of batteries. i intend to continue doing laser projects if this one goes well.
3.the purpose of this project was to make a cool thing i could have on my work bench that i could make for free out of parts from a broken computer.
4. the power supply is a 350w model
5. what i did was i soldered together the black and green wires to keep the power supply on then i soldered the 12v yellow wire to the input of my lm317 chip then ran the output of that to the diode then the output of the diode to the 5v red wire thus getting about 6-7 volts when you consider the voltage loss of the lm317 and the fact that i used a slightly higher resister due to me not having the one i needed.
6. the model number is BP350
I see. Personally, I wouldn't screw with a PSU like that. Too great of a chance to mess up and electrocute yourself.
 




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