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Introduction of Mirror

138 A Laser l...

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138 A Laser light of wavelength 660nm is used to weld Retina detachment. If a Laser pulse of width 60ms and power 0.5kW is used, the approximate number of photons in the pulse are

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Q. A Laser light of wavelength

660 n m

is used to weld Retina detachment. If a Laser pulse of width

60 m s

0.5 k W

is used, the approximate number of photons in the pulse are:
[Take Planck's constant

h = 6.62 \times 10^{- 34} J s

]

Q. A laser used to weld detached retinas emits light with a wavelength of

652 n m

in pulses that are

20.0 m s

in duration. The average power during each pulse is

0.6 W

Q. A laser used to weld detached retains emits light with a wavelength

652

nm in pulses that are of

20 m s

duration. The average power during each pulse is

0.6 W

. The energy in each pulse and in a single photon are :

Q. A ruby laser produces radiations of wavelengths, 662.6 nm in pulse duration are 10

^{- 6}

s. If the laser produces 0.39 J of energy per pulse, how many photons are produced in each pulse?

Q. The approximate number of photons in a femtosecond

(10^{- 15} s)

pulse of 600 nanometers wavelenghth light from a 10-kilowatt peak-power dye laser is

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