For green, the 808 pumps a crystal that lases at 1064nm, and then KTP doubles the 1064 to 532. For blue, the 808 pumps a crystal that lases at 946, and then LBO (or similar) doubles the 946 to 473.

the difference is that KTP is a more efficient doubling mdeium than the ones used for blue, and lasing at 1064 is more efficient than lasing at 946. But they both take exactly 2 steps.

the difference is that KTP is a more efficient doubling mdeium than the ones used for blue, and lasing at 1064 is more efficient than lasing at 946. But they both take exactly 2 steps.