Generation of Nonclassical Light by Unsaturated Two-Photon Absorption

Abstract

In this paper, we investigate the distribution statistics of photons in a single mode radiation field subjected to two-photon absorption (TPA) and the factors that contribute to squeezing and antibunching of photons, leading to the generation of nonclassical light. TPA is a nonlinear optical phenomenon in which the atoms interact with the light field by absorbing two photons simultaneously. The motivation to study TPA is the recent intense activity on nanocrystallites/quantum dots. Further, it is the only nonlinear optical phenomenon that can be analytically studied. The simultaneous occurrence of squeezing and antibunching is studied with small initial photon numbers by solving the master equation for TPA of a single mode radiation directly by numerical integration, without going through analytical procedure. The results are compared with those of analytical/numerical procedures available. Further, the discussion on the parameters of squeezing and antibunching for short-time (ST) as well as long-time is done comprehensively in the present work by taking up the ST approximation and summation of ST (SST) procedure along with the exact numerical method.

Photon antibunching in sixth harmonic generation

“…7 depict the variation of d A (l) and |α| 2 of equation ( 37) with different values of |gt|, demonstrating that the maximum reachable degree of antibunching is dependent on interaction time and is limited by a short interaction time. It is also worth noting that as the interaction time becomes shorter, the effect of photon antibunching increases [50][51][52].…”

“…It also shows that the maximum reachable degree of antibunching depends upon the interaction time and will be limited by short interaction time. It is worth noting that as the interaction time becomes shorter, the effect of photon antibunching increases [50][51][52].…”