Just In Case Your Interested In Laser Hair Removal

Wave 1 lasers: 1960 to 1969
The first lasers used for dermatology in the mid to late 1960's emitted a continuous wave, but this was not practical for hair removal, since the beam could not be controlled well enough to avoid collateral skin damage. The development of the Q-switch (similar to a camera shutter) allowed laser energy to be emitted in controlled pulses.
Wave 2 lasers: 1969 to present and more laser information here .