Answer to Question #114538 in Physics for Saba

Question

(1) Discuss the importance of Beer Lambert law for the laser?

(2) What will be rate of spontaneous emission to the stimulated emission in sun? Is laser action possible in sun, comment?

Answer 1

(1) According to Walter Frei (2015):

"When light is incident upon a semitransparent material, some of the energy will be absorbed by the material itself. If we can assume that the light is single wavelength, collimated (such as from a laser), and experiences very minimal refraction, reflection, or scattering within the material itself, then it is appropriate to model the light intensity via the Beer-Lambert law."

(2) The rate of spontaneous emission to the stimulated emission in sun will be greater than 1. The laser action is impossible in the sun because the sun is a source of not monochromatic and non-coherent radiation.

Reference

Frei, Walter, 2015. Modeling Laser-Material Interactions with the Beer-Lambert Law. Retrieved from https://www.comsol.com/blogs/modeling-laser-material-interactions-with-the-beer-lambert-law/