Part A What is the power of one laser pulse? Part B During the very brief time o

Question

Part A

What is the power of one laser pulse?

Part B

During the very brief time of the pulse, what is the intensity of the light wave?

LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. A typical LASIK laser emits a 1.0-mm-diameter laser beam with a wavelength of 193 nm. Each laser pulse lasts 14 ns and contains 2.0 mJ of light energy.

You may want to review ( pages 484 - 485) .

Part A

What is the power of one laser pulse?

Part B

During the very brief time of the pulse, what is the intensity of the light wave?

Explanation / Answer

Part a:

power = energy / time

p = 2 x 10-3J / (14 x 10-9s)

p = 1.42857 x 105 W

p = 1.43 x 105 W

part b:

intensity = power / area

I = 1.42857 x 105 W / (*0.00052)

I = 1.81983 x 1011 W/m²

I = 1.82 x 1011 W/m2

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