Hemoglobin absorbs light of wavelength 585nm, which means that lasers of that wavelength are often used...

 

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Hemoglobin absorbs light of wavelength 585nm, which means that lasers of that wavelength are often used to remove blood-induced blemishes such as birthmarks. Using the specific heat and heat of vaporization of water (4190 J/kg · K,2.256x10° J/kg ) a reasonable estimate of the power required can be made. If the laser pulses in 450µs bursts, and each pulse removes 2.0µg of blood, (a) How much energy must each pulse deliver to the site if the blood is 33°C? (b) What is the power output of the laser? (c) How many photons does each pulse carry? Hemoglobin absorbs light of wavelength 585nm, which means that lasers of that wavelength are often used to remove blood-induced blemishes such as birthmarks. Using the specific heat and heat of vaporization of water (4190 J/kg · K,2.256x10° J/kg ) a reasonable estimate of the power required can be made. If the laser pulses in 450µs bursts, and each pulse removes 2.0µg of blood, (a) How much energy must each pulse deliver to the site if the blood is 33°C? (b) What is the power output of the laser? (c) How many photons does each pulse carry?

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