What Is The Power Of One Laser Pulse – What You Should Be Aware Of
Ken asks…
how much energy per pulse must this laser provide?
Assume that you are creating a laser, with a wavelength of 532nm, that can vaporize people. To get a reasonable estimate for the power required, we can model the human body as having the same specific heat and heat of vaporization as water (4190 J/kg*K, 2.226×10^6 J/kg) Assume the average human weighs 80kg, and you want to kill someone so that they feel nothing nerve conduction is 1ms.
how much energy per pulse must this laser provide?
What must be the power output of this laser?
How many photons are emitted in one pulse?
E = 4.186 x 80 x 63 + 2256 x 80 = 21100+180000 = 202 MJ (1)
I get what you are saying I just want to know where the 63 is coming from?
answers:
So you want to heat the body from 37C to 100C and then boil it, all in 1 ms
specific heat of water is 4.186 kJ/kgC
heat of vaporization of water is 2256 kJ/kg
E = 4.186 x 80 x 63 + 2256 x 80 = 21100+180000 = 202 MJ (1)
power = 202 MJ / 1 ms = 202 GW
edit
63C = 100C (boiling point) – 37C (normal body temperature)
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