Two-Photon Self-Induced Transparency of Different-Frequency Optical Short Pulses in Potassium

Abstract

Novel propagation effects of coherent short light pulses have been studied in connection with a resonant interaction with a two-level system such as in ruby 1 and gaseous SF 6 2 " 4 and Rb. 5 Selfinduced transparency (SIT) due to a one-photon resonant transition was first investigated by Recently, coherent two-photon propagation in which twice the propagating frequency is resonant with a two-level system has also been analyzed, 6 * 7 though the experimental study has not been reported yet. We wish to present here the first observation and theoretical analysis of a new type of coherent propagation of two different-frequency optical pulses causing a two-photon transition in a gaseous three-level system. The present model excludes two simultaneous transitions in double resonance.The basic effect of coherent two-photon propagation can by analyzed in the limit of two different-frequency plane waves given as E.Low-loss, coherent two-photon propagation and pulse breakup with peak amplification are observed resulting from two-photon resonant self-induced transparency of different-, frequency optical pulses interacting with a three-level system in potassium vapor. Theoretical analysis yielding new area equations for two different-frequency pulses with computer solutions agrees well with the observed results.

Actuation Properties of Lead Zirconate Titanate Thick Films Structured on Si Membrane by the Aerosol Deposition Method

“…We have found in the literature the RWA solution of the amplitude equations (7) for the three-level system only in the approximation of zero dynamical Stark shift (RWAZS) [27][28][29][30] …”

“…In fact, the widely used RWAZS solution [27][28][29][30] does not have any solid physical background due to the assumption of zero dynamical Stark shift. The NRWA, RWA and RWAZS solutions coincide with each other only when the field is weak:…”

Observation of Two-Photon Optical Free-Induction Decay in Atomic Sodium Vapor

“…6 Detailed theoretical analysis of Raman beats has been made 7 ' 9 and the close relationship to two-photon free-induction decay has been discussed. 7 Other experimental work on two-photon transients include the reported observation of two-photon self-induced transparency 10 We have used the Stark-switching technique to observe two-photon optical free-induction decay in the visible using sodium vapor. Transients were observed with use of both a resonant and a nonresonant intermediate state for the two-photon transition.…”

Stochastic pulse switching in a degenerate resonant optical medium

“…While a fully quantum description of this interaction has also been developed [17,21], probably its most revealing description has been furnished by the semiclassical model provided by the Maxwell-Bloch system of equations [17,[22][23][24][25]. This model has helped to uncover the fundamentals of the resonant interaction between an electromagnetic field and a system of active atoms in the regime in which the field can be described classically and the medium by quantum mechanics, and in which a great number of the relevant experiments have been carried out [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. In fact, many physical effects observed in these experiments, from the photon echo [2] and self-induced transparency [3,4] to the chaotic laser dynamics [11], have been explained using the MaxwellBloch equations in the idealized two-level approximation, in which the light is assumed to be monochromatic and to interact resonantly with only two active atomic levels in the optical medium [17,[23][24][25][26][27][28].…”

“…Resonant interaction of light with active optical media has given rise to one of the most fruitful areas of applied physics in having provided the foundation of numerous important physical effects over the past six decades [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], and served as one of the basic mechanisms used in laser operation and optical amplifiers [16][17][18][19][20]. While a fully quantum description of this interaction has also been developed [17,21], probably its most revealing description has been furnished by the semiclassical model provided by the Maxwell-Bloch system of equations [17,[22][23][24][25].…”