Papers by Keyword: FWM

Abstract: We experimentally report that electromagnetically induced transparency (EIT) in the nonlinear propagation of probe beam, four-wave mixing (FWM) images and in a cascade three-level atomic systems. It is shown that by changing the frequency between pumping fields or dressing fields, respectively, the properties of the measured signals including the intensity and spatial images are affected greatly, including the electromagnetically induced transparency (EIT), Aulter-Townes splitting. By changing the laser frequency we can control the four wave signal, Moreover, the AT splitting effect due to spontaneous emission was also observed under EIT conditions..

Abstract: A switchable fiber laser based on Mach-Zehnder interferometer (MZI) and photonic crystal fiber (PCF) is demonstrated. A section of PCF in the fiber laser is used to induce four-wave mixings (FWM) effect and MZI acts as a comb filter. Experimental results show that stable single-wavelength, dual-wavelength and triple-wavelength operations can be obtained with the adjustment of the polarization controller. The power of two peaks of the dual-wavelength laser is almost the same under room temperature with an output power fluctuation less than 0.6dB. The advantages of the proposed fiber laser include quite stable wavelength and narrow linewidth owing to the contributions of FWM in the PCF.