Which parameter change increases the pulse width in laser settings?

• A. Decreasing repetition rate (Hz)
• B. Increasing pulse width (ms)
• C. Decreasing wavelength (nm)
• D. Decreasing energy (J/cm2)

Answer: (B)

The duration of each laser pulse is the pulse width. To increase how long energy is delivered in a single pulse, you raise the pulse width value. The repetition rate only changes how many pulses occur per second, not how long each pulse lasts. Wavelength determines what the light targets or penetrates, not the pulse duration. Energy per pulse (fluence) changes how much energy is delivered per pulse, but not how long the pulse itself lasts. So, increasing the pulse width directly lengthens the time the laser is on for each pulse (yielding a longer pulse).