Abstract
An optical ranging system which can see through opaque material has been demonstrated. It uses picosecond pulses, generated in a mode-locked dye laser for viewing and, as a very fast gate, a second frequency offset pulse train with a variable delay at the detector. The system could detect a reflection from a mirror inside an opaque mixture with 64-dB round-trip loss and with 1.7-mm range resolution. Transverse resolution of 0.1 mm was also observed. With certain obvious changes in instrumentation this could be converted into a scanning device. The present depth of penetration (round-trip attenuation) would correspond to 0.67 cm in human tissue.
© 1981 Optical Society of America
Full Article | PDF ArticleMore Like This
Francis Bos
Appl. Opt. 20(10) 1886-1890 (1981)
F. E. Hoge and R. N. Swift
Appl. Opt. 20(18) 3197-3205 (1981)
A. M. Malvezzi, L. Garifo, and G. Tondello
Appl. Opt. 20(14) 2560-2565 (1981)