Abstract

By use of dynamic subtraction it is feasible to adopt phase-sensitive detection with a CCD camera to reduce long-term optical background drift. We report on a two-order improvement of the signal-to-noise ratio. The improved system is used to image terahertz field distribution generated by an optically rectified electro-optic crystal with a modulation depth as small as 10-4. We also introduce a modified detection geometry that realizes near-field imaging capability with greatly improved spatial resolution.

© 2000 Optical Society of America

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