# Download Advances In Laser Physics by V S Letokhov, Pierre Meystre PDF

By V S Letokhov, Pierre Meystre

ISBN-10: 9058230104

ISBN-13: 9789058230102

The start of quantum electronics in the midst of the twentieth century and the subsquent discovery of the laser resulted in new tendencies in physics and a few photonic technolgies. This quantity is devoted to Peter Franken, a pioneer of nonlinear optics, and contains papers via the founders of quantum electronics, Aleksandr Prokhorov, Nicolaas Blombergen, and Norman Ramsey. the subjects lined diversity from astronomy to nuclear and semiconductor physics, and from primary difficulties in quantum mechanics to purposes in novel laser fabrics and nanoscience.

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**Extra info for Advances In Laser Physics**

**Example text**

The levels and interact with the optical probe field E. An incoherent one-way pump from is used to populate the upper levels. to The total Hamiltonian describing this four level atom in the SchrMinger picture HI Ho + Vdc + VOPI + Vvac consists of the following parts in the Schrodinger picture: Ie), la) Ib), l a) Ib) Ih) I d) ic) Ib), l a), I e ), = Vvac = Ii L (g(t' a� Ib)(al + g'fb aI l b )( c l + gt al l a )(dl + gt aIIc)(dl + h . c . ), k where tJ XI' is the dipole-matrix element for the transition x � y.

Thus, by going back to the Schr6dinger picture one gets the Vvac contribution to the equations of motion for the density matrix p. The equations for Pd1 and Pd2 are the following: (A8 ) (A9 ) The non-radiative decay rates y ' and y" are already added. Therefore in the steady state these coherences vanish, Pd1 = 0 and Pd2 = O. In the equations for the coherences Plb and P2b there are terms proportion al to the coherences Pdl and Pd2 between the levels 1 1 ), 12) and Id) which are therefore left out in the equations of motion for Plb ( 1 5 ) and P2b ( 1 6).

2 t , " dt [ Vvac (t ) , [ Vvac (t ),P tot ( t HI . -- = - - [ Vvac (t),PtO( (0) ] + dt n n f 0 (A6) Since only the equations for the atomic density operator p are of interest here, one takes the trace over the field states . The sum over k may be replaced by an integral (the integration over the polar and azimutal angle is already carried out), L k _ � f= 0 dvD(v) with D(v ) = -- , 2 VV n 2 c3 (A7) QUANTUM INTERFERENCE EFFECTS IN DC-FIELD COUPLED SYSTEMS 39 where D(v) is the density of modes and V is the quantization volume.