반도체 광증폭기내에서의 Highly nondegenerate Four - Wave Mixing의 해석

우상규, 이연호

본 논문에서는 반도체 광증폭기내에서 four-wave mixing을 발생시키는 spectral hole burning을 더욱 정확하게 해석하기 위하여 밀도행렬을 기존의 방법에 비하여 정확하게 푸는 방법에 대하여 설명하고 이러한 밀도행렬에 대한 수치해석을 실시하여 그 해를 구한다. 이렇게 구한 결과를 통해 반도체 광증폭기내에서의 four-wave mixing에 의한 파장변환을 설명하는 결합 파동 방정식을 유도하고 이것의 해를 구하여 반도체 광증폭기에서의 파장변환이 어떻게 발생하는 지를 설명하고 3차 섭동을 이용하여 계산된 기존의 결과와 비교한다.

Richard J. F. Normandin, G. I. Stegeman

孙江 Sun Jiang, Zuo Zhan-Chun, Xin Mi +4 more

We study the quantum interference in two-photon resonant nondegenerate four-wave mixing (NFWM) in a dressed cascade four-level system in which the two upper levels are coupled by a strong laser field. We find that in the presence of a strong coupling field, two-photon resonant NFWM spectrum exhibits Autler-Townes splitting, which reflects the levels of the dressed states. It also leads to either suppression or enhancement of the NFWM signal. This scheme involves the resonant three-photon excitation, therefore, provides a new spectroscopic tool for studying highly excited atomic states with high sensitivity.

R. Fantoni, M. Giorgi, L. De Dominicis

Govind Prasad Agrawal

Spectral hole burning in semiconductor lasers manifests as a nonlinear suppression of the mode gain by a few percent. In the presence of a probe wave, the same mechanism can lead to highly nondegenerate four-wave mixing (NDFWM) by creating the dynamic gain and index gratings at the beat frequency of the pump and probe waves. Since the grating efficiency is governed by the intraband relaxation time (typically <1 ps), significant NDFWM can occur even for a pump-probe detuning ∼100 GHz. We present the results for the conjugate reflectivity and the probe transmittivity when an InGaAsP laser is used as a traveling-wave amplifier.

V. D. Solovev, A I Khizhnyak