Laser power is usually expressed in which unit?

Laser power is a measure of the energy output per unit time and is primarily expressed in watts (W). A watt is defined as one joule per second, making it a relevant unit for describing the instantaneous power that a laser emits during operation. In the context of laser therapy, understanding power in watts is essential, as it allows practitioners to gauge the intensity of the laser treatment and its potential effectiveness.

The other units mentioned are used for different electrical and energy-related measurements. Joules measure energy rather than power, while volts indicate electrical potential, and amperes measure current. These units do not appropriately convey the rate of energy output for a laser, emphasizing the importance of using watts to represent laser power in clinical and practice settings.