Generalizedn-Photon Resonant2n-Wave Mixing in an (n+1)-Level System with Phase-Conjugate Geometry

Abstract

A generalized scheme for phase-conjugate resonant 2n-wave mixing, which has a high efficiency and is easy for phase matching, is proposed. As a new type of coherent laser spectroscopy this approach can be employed for studying highly excited atomic states or states with a high angular momentum. To demonstrate its feasibility we have studied the doubly excited autoionizing Rydberg states of Ba by phase-conjugate six-wave mixing, and have furthermore achieved eight-wave mixing in Na. This method may find wide application in related areas such as coherent transient spectroscopy, Autler-Townes spectroscopy and electromagnetically induced transparency. In particular, it may provide new insights into the nature of highly excited states.

Enhancing and suppressing four‐wave mixing in electromagnetically induced transparency window

“…[5,11] Fig. 2(a1)-(a3) presents the evolution of the FWM signal intensity versus the probe field detuning 1 for different 3 values.…”

Investigation of odd-order nonlinear susceptibilities in atomic vapors

“…Specifically, the dynamic equation for the perturbation density matrix can be obtained as ∂ρ/∂t = [H, ρ]/ih−(dρ/dt) relax , where H is the Hamiltonian and the term (dρ/dt) relax describes the decay. Taking the rotating-wave, weak-field and steady-state approximations, we can find a general solution of the dynamic equation in which the third-and fifth-order density matrix elements are [15,16] …”

“…Theoretical and experimental studies of electromagnetically induced transparency (EIT) in the last two decades opened a new way for enhancement of nonlinear optics processes [2][3][4][5]. Using EIT, scientists have observed several enhanced high-order nonlinear optics phenomena [6][7][8][9][10][11][12][13][14][15] and such observations have recently been extended to the coexistence of third-(four-wave mixing, FWM), fifth-(six-wave mixing, SWM) and even seventh-order (eight-wave mixing, EWM) nonlinear optics phenomena [16][17][18][19]. Such enhancement of nonlinear susceptibility is derived from the dressing effect of the strong coupling fields.…”

Controlled multi-wave mixing via interacting dark states in a five-level system

“…Moreover, eight-wave mixing (EWM) in a folded five-level atomic system has been observed recently [16]. In previously studied closecycled (ladder-type, N-type, double-Λ-type and folded) systems, FWM, SWM and EWM processes cannot coexist in a given configuration and different order nonlinearities can only be observed individually.…”

“…On the other hand, highly efficient multi-wave mixing (MWM) processes with coherently prepared states have also been intensively studied in the past few decades [9][10][11][12][13][14][15][16][17][18][19]. Enhanced four-wave mixing (FWM) and efficient six-wave mixing (SWM) processes have been experimentally demonstrated in optically dressed systems [9][10][11][12][13][14][15].…”