Abstract

We achieved apodization in a quasi-phase-matched (QPM) wavelength converter by changing the duty cycle of a χ(2) grating. The new design yields a large bandwidth and a flat phase-matching response with high conversion efficiency. Widely tunable 3-μm-band difference frequency generation was realized using an apodized QPM LiNbO3 ridge waveguide. We also demonstrated the simultaneous detection of the absorption lines of CH4 and C2H4 and obtained a broadband absorption spectrum of over 100nm using the widely tunable source.

© 2009 Optical Society of America

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