Which parameter controls how long the light energy is emitted in a pulse?

Which parameter controls how long the light energy is emitted in a pulse?

• A. Interpulse Delay
• B. Thermal Relaxation Time
• C. Variable Pulse Duration
• D. Electromagnetic Spectrum

Answer: (C)

Pulse duration determines how long energy is emitted during each pulse. This setting controls the length of time the light is active for a single pulse, directly shaping how long the tissue is exposed to energy. Shorter pulse durations deliver energy quickly with a high peak power, which helps target hair follicles while limiting heat spread to surrounding tissue. Longer pulse durations spread energy over a longer time, increasing heat diffusion and potentially affecting nearby structures. Interpulse delay refers to the time between pulses, not the length of a single pulse, so it doesn’t control how long energy is emitted in one burst. Thermal relaxation time is the tissue’s cooling time after heating and informs safety and repetition, but it isn’t the duration of a single pulse. The electromagnetic spectrum is simply the range of wavelengths used, not how long energy lasts in a pulse. The setting that adjusts how long each pulse lasts is Variable Pulse Duration.

Pulse duration determines how long energy is emitted during each pulse. This setting controls the length of time the light is active for a single pulse, directly shaping how long the tissue is exposed to energy. Shorter pulse durations deliver energy quickly with a high peak power, which helps target hair follicles while limiting heat spread to surrounding tissue. Longer pulse durations spread energy over a longer time, increasing heat diffusion and potentially affecting nearby structures.

Interpulse delay refers to the time between pulses, not the length of a single pulse, so it doesn’t control how long energy is emitted in one burst. Thermal relaxation time is the tissue’s cooling time after heating and informs safety and repetition, but it isn’t the duration of a single pulse. The electromagnetic spectrum is simply the range of wavelengths used, not how long energy lasts in a pulse. The setting that adjusts how long each pulse lasts is Variable Pulse Duration.