Why pumping is necessary for laser action? Compare and contrast three level and four level pumping schemes for lasers.
Pumping in lasers is essential to achieve population inversion, a state where more atoms or molecules are in excited states than in the ground state, allowing for stimulated emission and laser action to occur. This process involves providing external energy to the laser medium to elevate a significant number of particles ___ ___ ________ ___ ____ _______ ___ ______ ___.
______ __________ ___ _______ ______ ________ ____ _____ _______ _______ ____.
____ _______ ______ ____ ____ _____ _____.
________ ____ ______ _____ ______ ___ ___ __________ ___ ______ _____.
________ _______ ________ _______ ___.
_________ __________ _________ ____ _________ ______ _____ _______ ________.
_______ _______ _________ ___ _______ _________ _____ __________.
____ ____ _________ ___ ____ ________ _______ _________ __________ ________ _______ _____.
________ ________ ____ ____ ___ ______ ______ _______ _________ ____ _______ _________.
________ _____ ____ _______ ____ __________ ____ ___ ___ ___.
_________ _____ ____ _______ __________ ___ ________ __________ ______ _______.
_______ ____ _________ ____ ____ ______ ___ _____ ____ _________ ________.
__________ ___ _______ ______ _________ _____ __________ ______ _________ ____ __________ ___.
___ ________ _____ _______ ___.
_______ ___ ______ ______ _____ _______ _________ _______ _________.
_____ ______ ______ _______ __________.
___ ____ ______ __________ _________ ___ _____ ______ _____ _______ ______ _____.
_______ ___ _____ ____ ______ ___ __________ ________ ____ _________.
__________ ____ ____ _______ _______ ____.
__________ __________ ____ ______ ___ ____ ___ ______ _______ ____.
______ _____ _______ ________ ________ __________ ________ ____ ________ ______ ____.
__________ ___ ___ _______ ________ ___ ________.
____ ____ ________ ____ ______ ___ _________ ____.
______ ___ ________ ___ _________ _______.
________ ________ ____ _____ _______.
____ __________ ____ _________ ____ _________.
_____ __________ _____ _____ ______ __________ ______.
______ ______ ___ _________ ___ ___ ______.
__________ _____ _______ ________ __________ _____ _______ ______.
_______ _____ _________ _____ __________ _____ _________.
Get Full Answer on WhatsApp
The refractive indices of the core and cladding materials of an optical fibre are 1.64 and 1.53 respectively. Calculate the numerical aperture and light gathering capacity of the fibre.
Derive an expression for the intensity of the diffraction pattern obtained due to Fraunhofer diffraction from a single slit.
The wavelength of light used in Young’s double slit experiment is 6000 Å. The second and the fourth bright fringes from the centre of the fringe pattern are located respectively at 10.24 mm and 12.40 mm. If the observation screen is placed at a distance of 1 m from the slits, calculate the separation between the slits.
A beam of parallel light of wavelength 6000 Å is incident normally on a 1 rupee coin of diameter 3 cm. If an observation screen is placed at a distance of 1 m from the coin, how many Fresnel zones would be obstructed by it (the coin)? For what separation between the coin and the screen, only 5 zones would be cut off
Two energy levels of an atomic system are separated by energy corresponding to frequency 5.0 Hz. Assume that all atoms are in one or the other of these two energy levels. Compute the fraction of atoms in the upper energy level at temperature 600 K. Take kg = 1.38
JK
and h = 6.6
Js.
For a crystal, the refractive index no for the o-ray is 1.5442 for light of wavelength 6 . The least thickness of the crystal used as a quarter wave plate is found to be 1.65
m. Determine the refractive index ne for the e-ray in this crystal.
A beam of light is propagating in vacuum and its frequency is constant. Show that the average energy carried by it per unit area is proportional to the associated electric field vector.