2W laser is 2000mW laser. The color can be green, blue, violet, infrared (means invisible, no color). The wavelength(nm) may be 532,445-450,800nm-2000nm. The 2W laser are DPSS, pointers, modules or diodes.
The simple way to get 2W laser is to buy a 2W laser pointer. However if you want to keep 2w laser working for hours, you need 2W DPSS laser (diode laser).
To save money, you can get a cheaper 2w laser module from eBay. Check this thread for details. Most of the 2W laser diodes cost less than 100$. However you need to spend much time on it, to make a 2W laser beam from the diode.
Most of the 2W laser are blue ones, if you need green 2w, DPSS can meet your needs.
The most popular and famous 2w laser is from wickedlasers, they're the largest laser store in the world.They call it arctic, and the highest output power is <2W, in fact 1.4W.
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