We propose a novel scheme for generation of mid-infrared radiation in nonlinear waveguides with high absorption in that wavelength range. Coupling the absorbing nonlinear waveguide to a linear waveguide with low absorption allows the mid-infrared radiation to escape before absorption sets in, thus enhancing the frequency-conversion efficiency by as much as an order of magnitude.
© 2001 Optical Society of America
Jacob B. Khurgin, Di Yang, and Yujie J. Ding, "Generation of mid-infrared radiation in a highly absorbing nonlinear medium," J. Opt. Soc. Am. B 18, 340-343 (2001)