Integrated nonlinear waveguide spectrometer.

摘要

This invention pertains to integration of nonlinear parametric waveguide spectrometer (13) with a polyimide waveguide focusing mirror. The waveguide spectrometer uses nonlinear counter-propagating chi <2> interaction to simulate the action of a grating and produce the required chromatic dispersion. To map the near-field to far-field and separate different wavelength components, an organic-dielectric (e.g. polyimide/SiO2) guide (18) and a 45 DEG RIE etched mirror (16) were fabricated to simulate a concave focusing integrated mirror. The measured spot size at the focal plane of the mirror was about 0.7 mu m corresponding to about 1.6 Angstroms spectral resolution in agreement with the theoretical prediction. The device has good spectral resolution; however, the conversion efficiency is smaller than the theoretical prediction. Even with the low signal power level, the integrated device may be of use in applications that can take advantage of the visible output and do not require high power conversion efficiency. <IMAGE>