Light Laser
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| The Outdoors Advice Blog |
How many photons of laser light?
An argon ion laser puts out 5.0 W of continuous power at a wavelength of 532nm . The diameter of the laser beam is 5.0mmIf the laser is pointed toward a pinhole with a diameter of 1.0mm , how many photons will travel through the pinhole per second? Assume that the light intensity is equally distributed throughout the entire cross-sectional area of the beam. (1W = 1J/s )
(1/5)^2 or 1/25 of the power, 0.2 W, will pass through the hole.
Energy per photon Ep = hc/lambda = 3.73392011352613D-19 J
No. of photons/s = 0.2/Ep = 5.3563E17.
