Laser Math Problem

• let power = 10 watts in 0.2 seconds

• 10 x 0.2 = 2 watt.sec = 2 joules

• let spot size = 0.2 mm diam. = 0.01 cm radius

• area = p x (0.01)2 = 0.0003 cm2

• fluence = 2/0.0003 = 6.7 x 103 joules/cm2

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