Improvement of terahertz imaging with a dynamic subtraction technique

Journal Article · Sat Jun 10 00:00:00 EDT 2000 · Applied Optics

DOI:https://doi.org/10.1364/AO.39.002982· OSTI ID:20217162

Jiang, Zhiping ^[1]; Xu, X G ^[2]; Zhang, X -C ^[3]

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1. Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180-3590 (United States)
2. Department of Environmental and Energy Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3590 (United States)
3. Department of Physics, Applied Physics, and Astronomy and the Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3590 (United States)

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{sup -4}. We also introduce a modified detection geometry that realizes near-field imaging capability with greatly improved spatial resolution. (c) 2000 Optical Society of America.

• OSTI ID: 20217162
• Journal Information: Applied Optics, Journal Name: Applied Optics Journal Issue: 17 Vol. 39; ISSN 0003-6935; ISSN APOPAI
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ELECTRO-OPTICAL EFFECTS
EXPERIMENTAL DATA
IMAGE PROCESSING
LASER RADIATION
MEASURING METHODS
PULSE TECHNIQUES