I seem to remember from an academic class long, long ago, that lasers of a shorter wavelength have more "energy" than those of a longer wavelength.
Is there a formula to calculate the energy of a laser? (Given its wavelength and power in mW?)
Also, in real life experience, would that mean that mean if you had three different lasers of the same power (200mW red, green, and IR), the green laser would burn through electrical tape faster than a red laser, and the red laser would burn through electrical tape faster than the IR laser?
You are almost corrent, variant. the shorter wavelengths have more energy per photon than longer wavelengths. assuming a 100% efficient crystal, a 1mW IR beam of 1064 nM with (for example) 1 duodecilion photons/sec would enter, and atoms in the crystal would absorb photons (packets of wave energy, really) in a one, two manner. Once two IR photons were absorbed, a single photon with 532 nM would radiate from the atom along with a 1mW beam containing 0.5 duodecillion photons/sec.
at least that's the way I understand it. as far as burning power, it would really depend on the maximum absorption wavelength of the sample. assuming constant, 1mW is 1mW no matter what color.