The 2W lasers are : 2W DPSS 532nm green laser, 2W 808nm infrared laser pointer, red 2w handheld laser, and the most powerful 2W blue laser with the wavelength 445nm-450nm. The 2w blue laser is made of 2W 445nm blue laser diodes. The diodes are used in blue laser DVD.
The 2w laser is 2000mw, it can be 2w 532nm green laser, 2w 808nm infrared laser, 2w 650nm red laser . The common portable laser pointer can be 2w 808nm infrared laser or 2w 1064nm laser. If you want to produce 2w green laser, you need DPSS 2w green laser, such as Armlaser LDPumped 532nm Green Laser:
The 2w laser is powerful and most of them are used at Labs. The 2w 1064nm laser and 2w 808nm laser are easier to make than 2w 532nm and 650nm laser. Armlaser 2000mw Laser Module , 2w Laser Module:
There are some other 2W laser modules.