How does a Q-switched laser operate?

A Q-switched laser operates by delivering energy in short, high-intensity pulses, which allows it to produce very high peak power despite using relatively low average power. This pulsing capability is crucial for various applications, particularly in dermatology, tattoo removal, and other medical procedures where precise energy delivery is essential.

The Q-switching technique involves temporarily storing energy within the laser medium and then releasing it all at once, resulting in a brief yet powerful burst of laser light. This process is what differentiates Q-switched lasers from continuous wave lasers, which emit a steady beam of light and are not capable of producing these high peak powers. The ability to focus a large amount of energy into a very short duration makes Q-switched lasers effective for breaking down pigments in the skin, which contributes to their popularity in cosmetic and medical applications.

Additionally, the technology does not typically vary the wavelength during operation; it is designed to output at a specific wavelength determined by the laser medium used, which further emphasizes the distinct operational style of Q-switched lasers compared to other types.