A laser beam has a power of 90 w. It has an aperture of 3x103 m and emits a light of wavelength 600 The beam Is focused with a lens of focal length 0.2 m. Calculate the intensity of the image. O a 37.5x10° w/m2 O b. 39x10- w/m2 O c. 39x10° w/m? o d. 3.9 x10" w/m2
A laser beam has a power of 90 w. It has an aperture of 3x103 m and emits a light of wavelength 600 The beam Is focused with a lens of focal length 0.2 m. Calculate the intensity of the image. O a 37.5x10° w/m2 O b. 39x10- w/m2 O c. 39x10° w/m? o d. 3.9 x10" w/m2
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Transcribed Image Text:A laser beam has a power of 90 w. It has an aperture of 3x10 m and emits a light of wavelength 600
The beam is focused with a lens of focal length 0.2 m. Calculate the intensity of the image.
O a 37.5x10° w/m2
O b. 39x10 w/m2
Oc.39x10° w/m2
o d. 3.9 x10" w/m2
Einstein coefficient for Spontaneous emission is a function of frequency and properties of the material
O b. F
Transcribed Image Text:The neodymium laser can be made to produce
at a wavelength of by using
O a orange light, 6228 A, High powér optical source
Ob. blue light, 4752 Å, High optical power source
Oc green light, 5320 A, harmonic generation
od red light, 7000 A, resonant frequency
Dye lasers belong to the family of liquid laseris and can produce tunable laser output over wavelengths
ranging from 0.3 to 12 um.
O aF
O b.T
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