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What Parts to Buy?

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casey:
What's an average cost for the laser module?

Macpod:
There's not really an average cost because it will depend on what type of laser characteristics you need in your application. A cheap 30mW green 532nm laser will somewhere from 30 bucks+ while a 520mW 1W+ laser can cost in the thousands. Without stating parameters mentioned in my first response this becomes an impossible question to answer.

If you want to know what *I* used, I can't find the exact laser module but this one looks *similar*. Note that I am NOT making a recommendation that you use this laser as even 30mW can be dangerous if used improperly:
http://www.ebay.com/itm/30mw-532nm-Green-Laser-Module-w-TTL-Modulation-Slot-For-Stage-Light-Show-Laser-/141048140347?pt=LH_DefaultDomain_0&hash=item20d71fd23b

Note adding "TTL" or "analog" to your "532nm laser module" search string on ebay should be of help in identifying suitable modules.

As this seems to be your first experience with lasers I encourage you to first learn more about lasers and their safe use through a professionally taught class before continuing further.

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