## Momentum Laser

**Consider a beam of light from a diode laser. The wavelength of the light is = 600 nm, the diameter of the beam?**

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*Consider a beam of light from a diode laser. The wavelength of the light is = 600 nm, the diameter of the beam is 2.00 mm and the power is 0.50W. Answer the following questions;
a. What is the frequency of the light?
b. What is the energy per photon?
c. What is the momentum per photon?
d. What is its wavelength as it passes through glass (n = 1.50)?
e. What is the amplitude of the electric field?
f. What is the amplitude of the magnetic field?
*

a. What is the frequency of the light?

f = c/λ = 3e8/ 600e-9 = 5.e14 Hz

b. What is the energy per photon?

hf = 6.626e-34*5.e14 = 3.313e-19 J

c. What is the momentum per photon?

hc = 6.626e-34*3e8 = 1.9878e-25 kg m/s

Or

E* λ =3.313e-19*600e-9 = 1.9878e-25 kgm/s

d. What is its wavelength as it passes through glass (n = 1.50)?

λ(glass) = λ(air) / μ = 600e-9/1.5 =400e-9 m

e. What is the amplitude of the electric field?

E= √ (2*energy density/ ξo)

f. What is the amplitude of the magnetic field?

B = √ ( 2*energy density*μo)

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