PC Peripherals Logitech® G15 Gaming Keyboard and G5, G7 Mouse Line Up

think it works even on glass or reflective surfaces which regular optical mice cant use
 
Masky had posted this link quite sometime back:
http://www.ida.net/users/oe1k/OpticalMouse/

Has some good details on the way optical mice work, including the types of sensors used in different optical mice. Scroll down a bit and you'll find a topic called "LED vs LASER". It has a few pics showing the level of detail picked up by a regular LED optical mouse and a LASER optical mouse. As you guessed, the LASER shows significantly more detail than that picked up by the LED.
I also quote from that site:
Basically, because the laser is a uniform tight beam, it reflects more detail from minor surface defects and textures, even on what normal LED illumination shows as uniform-color smooth shiny surfaces (like white board), resulting in, "20x times the tracking power of optical." (That is, it can navigate on surfaces with 20x smaller surface features.) Logitech still warns that the "Laser still may not track on mirrored or clear surfaces, such as windowpane glass."
 
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